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<div class="section" id="natural-history-of-system-metadata">
<h1>Natural History of System Metadata<a class="headerlink" href="#natural-history-of-system-metadata" title="Permalink to this headline">¶</a></h1>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Revisions:</th><td class="field-body"><table border="1" class="first last docutils">
<colgroup>
<col width="11%" />
<col width="89%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Date</th>
<th class="head">Comment</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>20100303</td>
<td>(D.V.) Initial draft</td>
</tr>
<tr class="row-odd"><td>20100304</td>
<td><p class="first">(D.V.) Revised draft and added scenario where system
metadata is stored only on the Coordinating Nodes</p>
<p class="last">Corrected DataSysMetadataModified changes in scenario B.</p>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<p>This document describes the generation of system metadata associated with a
data object and its associated science metadata document as they are added to
a DataONE Member Node and subsequently propagated through the DataONE
infrastructure.</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#process-overview" id="id2">Process Overview</a></li>
<li><a class="reference internal" href="#process-detail-scenario-a" id="id3">Process Detail - Scenario A</a></li>
<li><a class="reference internal" href="#process-detail-scenario-b" id="id4">Process Detail - Scenario B.</a></li>
<li><a class="reference internal" href="#final-state-of-system-metadata" id="id5">Final State of System Metadata</a></li>
<li><a class="reference internal" href="#conclusions" id="id6">Conclusions</a></li>
</ul>
</div>
<div class="section" id="process-overview">
<h2><a class="toc-backref" href="#id2">Process Overview</a><a class="headerlink" href="#process-overview" title="Permalink to this headline">¶</a></h2>
<p>There are two scenarios examined here: A) the system metadata is stored on all
nodes (MN and CN) and B) system metadata is stored only on the CNs. The general
sequence of operations is the same for both scenarios with the exclusion of a
couple of steps from scenario B.</p>
<ol class="arabic">
<li><p class="first">Scientist using an ITK tool generates some science data and some science
metadata describing the science data.</p>
</li>
<li><p class="first">The ITK populates the required fields of the system metadata documents.</p>
</li>
<li><p class="first">Not necessarily in this order:</p>
<ol class="loweralpha simple">
<li>The ITK uploads the science data</li>
<li>The ITK uploads the science metadata</li>
</ol>
<p>On receipt, the MN updates the system metadata fields for which it is
responsible.</p>
</li>
<li><p class="first">The CN detects new content is available on the MN using the listObjects()
method.</p>
</li>
<li><p class="first">Copies of the science metadata and the two (incomplete) system metadata
documents are retrieved by the CN.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">A:</th><td class="field-body">The CN updates the system metadata replication information, and indicates
to the MN that it should update its copy of the system metadata objects.</td>
</tr>
<tr class="field-even field"><th class="field-name">B:</th><td class="field-body">The CN updates the system metadata replication information.</td>
</tr>
</tbody>
</table>
</li>
<li><p class="first">The CN issues a replication order to an MN.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">A:</th><td class="field-body">The recipient MN retrieves copies of the system metadata and
associated objects (science data and metadata)</td>
</tr>
<tr class="field-even field"><th class="field-name">B:</th><td class="field-body">The recipient MN retrieves copies of the various objects indicated
by the CN</td>
</tr>
</tbody>
</table>
</li>
<li><p class="first">The recipient MN requests content from the origin MN, which in turn
verifies the request with the CN.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">A:</th><td class="field-body">The origin MN and the CN update copies of system metadata</td>
</tr>
<tr class="field-even field"><th class="field-name">B:</th><td class="field-body">The CN updates system metadata</td>
</tr>
</tbody>
</table>
</li>
<li><p class="first">After verifying the successful transfer of content, the recipient MN
indicates completion to the CN.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">A:</th><td class="field-body">The CN updates the system metadata for the objects and ensures that the
MN copies of the system metadata are accurate.</td>
</tr>
<tr class="field-even field"><th class="field-name">B:</th><td class="field-body">The CN updates the system metadata for the objects.</td>
</tr>
</tbody>
</table>
</li>
</ol>
<p>The change in system metadata state is shown in the following process detail
sections. In each case, the identifiers used for the various elements are
indicated in table 1.</p>
<table border="1" class="docutils" id="id1">
<caption><span class="caption-text">Table 1. Identifiers used in the example sequence.</span><a class="headerlink" href="#id1" title="Permalink to this table">¶</a></caption>
<colgroup>
<col width="24%" />
<col width="76%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Identifier</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>sciD.1</td>
<td>Science Data</td>
</tr>
<tr class="row-odd"><td>sciM.1</td>
<td>Science metadata describing sciD.1</td>
</tr>
<tr class="row-even"><td>sysD.1</td>
<td>System metadata for object sciD.1</td>
</tr>
<tr class="row-odd"><td>sysM.1</td>
<td>System metadata for object sciM.1</td>
</tr>
<tr class="row-even"><td>cn1.dataone.org</td>
<td>A Coordinating Node</td>
</tr>
<tr class="row-odd"><td>mn1.dataone.org</td>
<td>Member Node that is initial recipient of data</td>
</tr>
<tr class="row-even"><td>mn2.dataone.org</td>
<td>Member Node that receives a copy of the objects</td>
</tr>
</tbody>
</table>
<p>The following fictitious script provides an example of how uploading content
to a Member Node using a DataONE client library might occur.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">from</span> <span class="nn">pyd1.client</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">pyd1.exceptions</span> <span class="kn">import</span> <span class="o">*</span>
<span class="n">d1client</span> <span class="o">=</span> <span class="n">pyd1</span><span class="o">.</span><span class="n">client</span><span class="p">(</span><span class="n">identity</span><span class="o">=</span><span class="s2">"/home/vieglais/.d1/credentials"</span><span class="p">,</span>
<span class="n">defaults</span><span class="o">=</span><span class="s2">"/home/vieglais/.d1/defaults.ini"</span><span class="p">)</span>
<span class="n">d1client</span><span class="o">.</span><span class="n">login</span><span class="p">()</span>
<span class="c1"># The science data and metadata as files on disk</span>
<span class="n">data_file</span> <span class="o">=</span> <span class="s2">"/home/vieglais/data/mydata.csv"</span>
<span class="n">meta_file</span> <span class="o">=</span> <span class="s2">"/home/vieglais/data/mymeta.xml"</span>
<span class="c1"># Reserve a couple of identifiers. Note that this reservation will</span>
<span class="c1"># be system-wide.</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">data_id</span> <span class="o">=</span> <span class="n">d1client</span><span class="o">.</span><span class="n">reserve</span><span class="p">(</span><span class="sa">u</span><span class="s2">"sysD.1"</span><span class="p">)</span>
<span class="n">meta_id</span> <span class="o">=</span> <span class="n">d1client</span><span class="o">.</span><span class="n">reserve</span><span class="p">(</span><span class="sa">u</span><span class="s2">"sysM.1"</span><span class="p">)</span>
<span class="k">except</span> <span class="n">IdentifierInUseException</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
<span class="n">logging</span><span class="o">.</span><span class="n">fatal</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">()</span>
<span class="c1"># Generate stub system metadata documents. Default values</span>
<span class="c1"># for access rules etc are loaded from defaults.ini</span>
<span class="n">sysm_data</span> <span class="o">=</span> <span class="n">d1client</span><span class="o">.</span><span class="n">generateSysMeta</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="n">data_id</span><span class="p">,</span>
<span class="n">format</span><span class="o">=</span><span class="s2">"text/csv"</span><span class="p">,</span>
<span class="n">describedBy</span><span class="o">=</span><span class="n">meta_id</span><span class="p">)</span>
<span class="n">sysm_meta</span> <span class="o">=</span> <span class="n">d1client</span><span class="o">.</span><span class="n">generateSysMeta</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="n">meta_id</span><span class="p">,</span>
<span class="n">format</span><span class="o">=</span><span class="s2">"eml://ecoinformatics.org/eml-2.1.0"</span><span class="p">,</span>
<span class="n">describedBy</span><span class="o">=</span><span class="n">data_id</span><span class="p">)</span>
<span class="c1"># Open file handles for data and metadata</span>
<span class="n">fdata</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="n">data_file</span><span class="p">,</span> <span class="s2">"r"</span><span class="p">)</span>
<span class="n">fmetadata</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="n">meta_file</span><span class="p">,</span> <span class="s2">"r"</span><span class="p">)</span>
<span class="c1"># Send the data to the Member Node</span>
<span class="n">target_node</span> <span class="o">=</span> <span class="s1">'mn1.dataone.org'</span>
<span class="n">data_sysid</span> <span class="o">=</span> <span class="n">d1client</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">data_id</span><span class="p">,</span> <span class="n">fdata</span><span class="p">,</span> <span class="n">sys_data</span><span class="p">,</span>
<span class="n">target</span><span class="o">=</span><span class="n">target_node</span><span class="p">)</span>
<span class="n">meta_sysid</span> <span class="o">=</span> <span class="n">d1client</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">meta_id</span><span class="p">,</span> <span class="n">fmeta</span><span class="p">,</span> <span class="n">sys_meta</span><span class="p">,</span>
<span class="n">target</span><span class="o">=</span><span class="n">target_node</span><span class="p">)</span>
<span class="n">fdata</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="n">fmeta</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="process-detail-scenario-a">
<h2><a class="toc-backref" href="#id3">Process Detail - Scenario A</a><a class="headerlink" href="#process-detail-scenario-a" title="Permalink to this headline">¶</a></h2>
<div class="section" id="step-a1">
<h3>Step A1.<a class="headerlink" href="#step-a1" title="Permalink to this headline">¶</a></h3>
<p>The scientist generates a data set and associated science metadata.</p>
</div>
<div class="section" id="step-a2">
<h3>Step A2.<a class="headerlink" href="#step-a2" title="Permalink to this headline">¶</a></h3>
<p>Using tools in the ITK, the scientist generates two initial system metadata
documents, one describing the science metadata (<code class="docutils literal"><span class="pre">sysm_M.1</span></code>), one describing
the science data (<code class="docutils literal"><span class="pre">sysm_D.1</span></code>).</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>objectFormat</td>
<td>text/csv</td>
<td>eml://ecoinformatics.org/eml-2.1.0</td>
</tr>
<tr class="row-even"><td>size</td>
<td>1450238</td>
<td>8132</td>
</tr>
<tr class="row-odd"><td>submitter</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>rightsHolder</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-odd"><td>obsoletes</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>obsoletedBy</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>derivedFrom</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>describes</td>
<td></td>
<td>sciD.1</td>
</tr>
<tr class="row-odd"><td>describedBy</td>
<td>sciM.1</td>
<td></td>
</tr>
<tr class="row-even"><td>checksum</td>
<td>2e01e17467891f7c933dbaa00e1459d23db3fe4f</td>
<td>9967467891f7c933dbaa00e1459d23db3f342</td>
</tr>
<tr class="row-odd"><td>checksumAlgorithm</td>
<td>SHA-1</td>
<td>SHA-1</td>
</tr>
<tr class="row-even"><td>accessRule[1]</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.rule</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Read</td>
<td>Read</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>*</td>
<td>*</td>
</tr>
<tr class="row-even"><td>accessRule[2]</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.rule</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Write</td>
<td>Write</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-a3">
<h3>Step A3.<a class="headerlink" href="#step-a3" title="Permalink to this headline">¶</a></h3>
<p>The client tool transmits the data, science metadata and two stub system
metadata documents to a Member Node. The Member Node updates values of the
system metadata for which it is responsible.</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>objectFormat</td>
<td>text/csv</td>
<td>eml://ecoinformatics.org/eml-2.1.0</td>
</tr>
<tr class="row-even"><td>size</td>
<td>1450238</td>
<td>8132</td>
</tr>
<tr class="row-odd"><td>submitter</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>rightsHolder</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-odd"><td>obsoletes</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>obsoletedBy</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>derivedFrom</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>describes</td>
<td></td>
<td>sciD.1</td>
</tr>
<tr class="row-odd"><td>describedBy</td>
<td>sciM.1</td>
<td></td>
</tr>
<tr class="row-even"><td>checksum</td>
<td>2e01e17467891f7c933dbaa00e1459d23db3fe4f</td>
<td>9967467891f7c933dbaa00e1459d23db3f342</td>
</tr>
<tr class="row-odd"><td>checksumAlgorithm</td>
<td>SHA-1</td>
<td>SHA-1</td>
</tr>
<tr class="row-even"><td>accessRule[1]</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.rule</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Read</td>
<td>Read</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>*</td>
<td>*</td>
</tr>
<tr class="row-even"><td>accessRule[2]</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.rule</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Write</td>
<td>Write</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td><strong>2010-03-04T18:13:51.0Z</strong></td>
<td><strong>2010-03-04T18:14:45.0Z</strong></td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td><strong>2010-03-04T18:13:51.0Z</strong></td>
<td><strong>2010-03-04T18:14:45.0Z</strong></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td><strong>mn1.dataone.org</strong></td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td><strong>mn1.dataone.org</strong></td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td><strong>mn1.dataone.org</strong></td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td><strong>Queued</strong></td>
<td><strong>Queued</strong></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>Since there are many copies of system metadata from this point onwards, only
the replication properties of the <code class="docutils literal"><span class="pre">sysD.1</span></code> document are considered,
summarized in a table as follows. MN1, CN, MN2 = copy of system metadata on
<code class="docutils literal"><span class="pre">mn1.dataone.org</span></code>, <code class="docutils literal"><span class="pre">cn1.dataone.org</span></code>, <code class="docutils literal"><span class="pre">mn2.dataone.org</span></code> respectively.</p>
<table border="1" class="docutils">
<colgroup>
<col width="28%" />
<col width="24%" />
<col width="24%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Queued</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-a4">
<h3>Step A4.<a class="headerlink" href="#step-a4" title="Permalink to this headline">¶</a></h3>
<p>A CN detects new content available on <code class="docutils literal"><span class="pre">mn1.dataone.org</span></code> through the
listObjects() method.</p>
<p>There is no change of state in system metadata resulting from this operation.</p>
</div>
<div class="section" id="step-a5">
<h3>Step A5.<a class="headerlink" href="#step-a5" title="Permalink to this headline">¶</a></h3>
<p>Copies of <code class="docutils literal"><span class="pre">sciM.1</span></code>, <code class="docutils literal"><span class="pre">sysM.1</span></code>, and <code class="docutils literal"><span class="pre">sysD.1</span></code> are retrieved to the CN, and
the system metadata objects are updated. There are three steps to this process:</p>
<ol class="arabic simple">
<li>The CN requests a copy of the objects.</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="28%" />
<col width="24%" />
<col width="24%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td><strong>Requested</strong></td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<ol class="arabic simple" start="2">
<li>The CN receives a copy of the metadata.</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="28%" />
<col width="24%" />
<col width="24%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td><strong>mn1.dataone.org</strong></td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Requested</td>
<td><strong>Requested</strong></td>
<td> </td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<ol class="arabic simple" start="3">
<li>The CN verifies the checksums and indicates to the MN that the copy is
complete, providing the time stamp that it used for the verification (ensuring
identical copies of the system metadata).</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="25%" />
<col width="25%" />
<col width="25%" />
<col width="25%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td><strong>Completed</strong></td>
<td><strong>Completed</strong></td>
<td> </td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td><strong>2010-03-04T19:13:51.0Z</strong></td>
<td><strong>2010-03-04T19:13:51.0Z</strong></td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-a6">
<h3>Step A6.<a class="headerlink" href="#step-a6" title="Permalink to this headline">¶</a></h3>
<p>The CN initiates replication of content from <code class="docutils literal"><span class="pre">mn1.dataone.org</span></code> to <code class="docutils literal"><span class="pre">mn2.dataone.org</span></code>.</p>
<ol class="arabic simple">
<li>The CN sends a replication request to MN2, indicating that it should
retrieve the object from MN1.</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="28%" />
<col width="24%" />
<col width="24%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
<td> </td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[2].replicaMemberNode</td>
<td> </td>
<td><strong>mn2.dataone.org</strong></td>
<td> </td>
</tr>
<tr class="row-even"><td>R[2].replicationStatus</td>
<td> </td>
<td><strong>Queued</strong></td>
<td> </td>
</tr>
<tr class="row-odd"><td>R[2].replicaVerified</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<ol class="arabic simple" start="2">
<li>MN2 requests the content from MN1.</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="27%" />
<col width="23%" />
<col width="23%" />
<col width="27%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
<td><strong>Completed</strong></td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
<td><strong>2010-03-04T19:13:51.0Z</strong></td>
</tr>
<tr class="row-odd"><td>R[2].replicaMemberNode</td>
<td><strong>mn2.dataone.org</strong></td>
<td>mn2.dataone.org</td>
<td><strong>mn2.dataone.org</strong></td>
</tr>
<tr class="row-even"><td>R[2].replicationStatus</td>
<td><strong>Requested</strong></td>
<td>Queued</td>
<td><strong>Requested</strong></td>
</tr>
<tr class="row-odd"><td>R[2].replicaVerified</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<ol class="arabic simple" start="3">
<li>MN1 checks with CN that the object was requested</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="28%" />
<col width="24%" />
<col width="24%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
</tr>
<tr class="row-odd"><td>R[2].replicaMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>R[2].replicationStatus</td>
<td>Requested</td>
<td><strong>Requested</strong></td>
<td>Requested</td>
</tr>
<tr class="row-odd"><td>R[2].replicaVerified</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<ol class="arabic simple" start="4">
<li>MN2 verifies that the checksum is correct, then indicates to MN1 that the
copy was correctly transferred, forwarding the timestamp for when the
object was verified to MN1.</li>
</ol>
<table border="1" class="docutils">
<colgroup>
<col width="25%" />
<col width="25%" />
<col width="25%" />
<col width="25%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
</tr>
<tr class="row-odd"><td>R[2].replicaMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>R[2].replicationStatus</td>
<td><strong>Completed</strong></td>
<td>Requested</td>
<td><strong>Completed</strong></td>
</tr>
<tr class="row-odd"><td>R[2].replicaVerified</td>
<td><strong>2010-03-04T20:00:00.0Z</strong></td>
<td> </td>
<td><strong>2010-03-04T20:00:00.0Z</strong></td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-a8">
<h3>Step A8.<a class="headerlink" href="#step-a8" title="Permalink to this headline">¶</a></h3>
<p>MN2 informs the Coordinating Node that it has retrieved a valid copy of the
object from MN1, forwarding the time stamp for when the verification was made.</p>
<table border="1" class="docutils">
<colgroup>
<col width="27%" />
<col width="23%" />
<col width="27%" />
<col width="23%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">MN1</th>
<th class="head">CN</th>
<th class="head">MN2</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>R[1].replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>R[1].replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>R[1].replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:51.0Z</td>
</tr>
<tr class="row-odd"><td>R[2].replicaMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>R[2].replicationStatus</td>
<td>Completed</td>
<td><strong>Completed</strong></td>
<td>Completed</td>
</tr>
<tr class="row-odd"><td>R[2].replicaVerified</td>
<td>2010-03-04T20:00:00.0Z</td>
<td><strong>2010-03-04T20:00:00.0Z</strong></td>
<td>2010-03-04T20:00:00.0Z</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="process-detail-scenario-b">
<h2><a class="toc-backref" href="#id4">Process Detail - Scenario B.</a><a class="headerlink" href="#process-detail-scenario-b" title="Permalink to this headline">¶</a></h2>
<p>This scenario uses the notion that system metadata is stored on the CNs only.</p>
<div class="section" id="step-b1">
<h3>Step B1.<a class="headerlink" href="#step-b1" title="Permalink to this headline">¶</a></h3>
<p>The scientist generates a data set and associated science metadata.</p>
</div>
<div class="section" id="step-b2">
<h3>Step B2.<a class="headerlink" href="#step-b2" title="Permalink to this headline">¶</a></h3>
<p>Using tools in the ITK, the scientist generates two initial system metadata
documents, one describing the science metadata (<code class="docutils literal"><span class="pre">sysm_M.1</span></code>), one describing
the science data (<code class="docutils literal"><span class="pre">sysm_D.1</span></code>).</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>objectFormat</td>
<td>text/csv</td>
<td>eml://ecoinformatics.org/eml-2.1.0</td>
</tr>
<tr class="row-even"><td>size</td>
<td>1450238</td>
<td>8132</td>
</tr>
<tr class="row-odd"><td>submitter</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>rightsHolder</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-odd"><td>obsoletes</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>obsoletedBy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>derivedFrom</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>describes</td>
<td> </td>
<td>sciD.1</td>
</tr>
<tr class="row-odd"><td>describedBy</td>
<td>sciM.1</td>
<td> </td>
</tr>
<tr class="row-even"><td>checksum</td>
<td>2e01e17467891f7c933dbaa00e1459d23db3fe4f</td>
<td>9967467891f7c933dbaa00e1459d23db3f342</td>
</tr>
<tr class="row-odd"><td>checksumAlgorithm</td>
<td>SHA-1</td>
<td>SHA-1</td>
</tr>
<tr class="row-even"><td>accessRule[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.rule</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Read</td>
<td>Read</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>*</td>
<td>*</td>
</tr>
<tr class="row-even"><td>accessRule[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.rule</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Write</td>
<td>Write</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-b3">
<h3>Step B3.<a class="headerlink" href="#step-b3" title="Permalink to this headline">¶</a></h3>
<p>The client tool transmits the data, science metadata and two stub system
metadata documents to a Member Node (<code class="docutils literal"><span class="pre">mn1.dataone.org</span></code>). On receipt, the
Member Node sets the values of several fields as indicted in the table below.</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>objectFormat</td>
<td>text/csv</td>
<td>eml://ecoinformatics.org/eml-2.1.0</td>
</tr>
<tr class="row-even"><td>size</td>
<td>1450238</td>
<td>8132</td>
</tr>
<tr class="row-odd"><td>submitter</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>rightsHolder</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-odd"><td>obsoletes</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>obsoletedBy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>derivedFrom</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>describes</td>
<td> </td>
<td>sciD.1</td>
</tr>
<tr class="row-odd"><td>describedBy</td>
<td>sciM.1</td>
<td> </td>
</tr>
<tr class="row-even"><td>checksum</td>
<td>2e01e17467891f7c933dbaa00e1459d23db3fe4f</td>
<td>9967467891f7c933dbaa00e1459d23db3f342</td>
</tr>
<tr class="row-odd"><td>checksumAlgorithm</td>
<td>SHA-1</td>
<td>SHA-1</td>
</tr>
<tr class="row-even"><td>accessRule[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.ruleType</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Read</td>
<td>Read</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>*</td>
<td>*</td>
</tr>
<tr class="row-even"><td>accessRule[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.ruleType</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Write</td>
<td>Write</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td><strong>2010-03-04T18:13:51.0Z</strong></td>
<td><strong>2010-03-04T18:14:45.0Z</strong></td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td><strong>2010-03-04T18:13:51.0Z</strong></td>
<td><strong>2010-03-04T18:14:45.0Z</strong></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td><strong>mn1.dataone.org</strong></td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td><strong>mn1.dataone.org</strong></td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td><strong>mn1.dataone.org</strong></td>
<td><strong>mn1.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td><strong>Queued</strong></td>
<td><strong>Queued</strong></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-b4">
<h3>Step B4.<a class="headerlink" href="#step-b4" title="Permalink to this headline">¶</a></h3>
<p>A CN detects new content available on <code class="docutils literal"><span class="pre">mn1.dataone.org</span></code> through
<code class="xref py py-func docutils literal"><span class="pre">MN_replication.listObjects()</span></code>.</p>
<p>There is no change of state in system metadata resulting from this operation.</p>
</div>
<div class="section" id="step-b5">
<h3>Step B5.<a class="headerlink" href="#step-b5" title="Permalink to this headline">¶</a></h3>
<p>Copies of <code class="docutils literal"><span class="pre">sciM.1</span></code>, <code class="docutils literal"><span class="pre">sysM.1</span></code>, and <code class="docutils literal"><span class="pre">sysD.1</span></code> are retrieved to the
Coordinating Node, and the system metadata objects are updated on the
Coordinating Node. For sake of brevity, only the elements from
ReplicationPolicy onwards are shown in the remaining state tables since the
remainder of the content does not change.</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>...</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td>2010-03-04T18:13:51.0Z</td>
<td>2010-03-04T18:14:45.0Z</td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td><strong>2010-03-04T19:13:51.0Z</strong></td>
<td><strong>2010-03-04T19:13:52.0Z</strong></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td><strong>Completed</strong></td>
<td><strong>Completed</strong></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td><strong>2010-03-04T19:13:51.0Z</strong></td>
<td><strong>2010-03-04T19:13:52.0Z</strong></td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-b6">
<h3>Step B6.<a class="headerlink" href="#step-b6" title="Permalink to this headline">¶</a></h3>
<p>The Coordinating Node initiates replication of the objects <code class="docutils literal"><span class="pre">sciM.1</span></code> and
<code class="docutils literal"><span class="pre">sciD.1</span></code> from <code class="docutils literal"><span class="pre">mn1.dataone.org</span></code> to <code class="docutils literal"><span class="pre">mn2.dataone.org</span></code>. It does this by
calling the “replicate()” method on <code class="docutils literal"><span class="pre">mn2.dataone.org</span></code>.</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>...</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td>2010-03-04T18:13:51.0Z</td>
<td>2010-03-04T18:14:45.0Z</td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td><strong>2010-03-04T20:58:00.0Z</strong></td>
<td><strong>2010-03-04T20:58:00.0Z</strong></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:52.0Z</td>
</tr>
<tr class="row-odd"><td>replica[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td><strong>mn2.dataone.org</strong></td>
<td><strong>mn2.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td><strong>Queued</strong></td>
<td><strong>Queued</strong></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-b7">
<h3>Step B7.<a class="headerlink" href="#step-b7" title="Permalink to this headline">¶</a></h3>
<p>The node <code class="docutils literal"><span class="pre">mn2.dataone.org</span></code> requests the objects <code class="docutils literal"><span class="pre">sciM.1</span></code> and <code class="docutils literal"><span class="pre">sciD.1</span></code>
from <code class="docutils literal"><span class="pre">mn1.dataone.org</span></code>. After verifying the request with a Coordinating Node
(which has a side effect of setting the system metadata ReplicationStatus to
Requested), <code class="docutils literal"><span class="pre">mn1.dataone.org</span></code> returns the objects. (Note that in actuality,
each object is requested individually.)</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>...</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td>2010-03-04T18:13:51.0Z</td>
<td>2010-03-04T18:14:45.0Z</td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td><strong>2010-03-04T20:59:00.0Z</strong></td>
<td><strong>2010-03-04T20:59:00.0Z</strong></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:52.0Z</td>
</tr>
<tr class="row-odd"><td>replica[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td><strong>mn2.dataone.org</strong></td>
<td><strong>mn2.dataone.org</strong></td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td><strong>Requested</strong></td>
<td><strong>Requested</strong></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="step-b8">
<h3>Step B8.<a class="headerlink" href="#step-b8" title="Permalink to this headline">¶</a></h3>
<p>The node <code class="docutils literal"><span class="pre">mn2.dataone.org</span></code> verifies the retrieved objects against their
checksums and indicates to the Coordinating Node that transfer was successful.</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>...</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td>2010-03-04T18:13:51.0Z</td>
<td>2010-03-04T18:14:45.0Z</td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td><strong>2010-03-04T21:00:00.0Z</strong></td>
<td><strong>2010-03-04T21:00:00.0Z</strong></td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:52.0Z</td>
</tr>
<tr class="row-odd"><td>replica[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td><strong>Completed</strong></td>
<td><strong>Completed</strong></td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td><strong>2010-03-04T21:00:00.0Z</strong></td>
<td><strong>2010-03-04T21:00:00.0Z</strong></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="final-state-of-system-metadata">
<h2><a class="toc-backref" href="#id5">Final State of System Metadata</a><a class="headerlink" href="#final-state-of-system-metadata" title="Permalink to this headline">¶</a></h2>
<p>Assuming the replication policy was for one replica to be created for
<code class="docutils literal"><span class="pre">sciM.1</span></code> and <code class="docutils literal"><span class="pre">sciD.1</span></code>, then the eventual end state of the associated
system metadata documents (<code class="docutils literal"><span class="pre">sysM.1</span></code> and <code class="docutils literal"><span class="pre">sysD.1</span></code> respectively) after
synchronization of the Coordinating Nodes, would be something like the
following.</p>
<p>Note that synchronization between Coordinating Nodes does not trigger an
update to the DataSysMetadataModified field. This is necessary to avoid a
situation where the state of the metadata is never consistent between
Coordinating Nodes.</p>
<p>Note also that even though the replication policy of <code class="docutils literal"><span class="pre">sciD.1</span></code> indicates that
NumberReplicas is one, there are actually three additional replicas stored on
the Coordinating Nodes.</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="38%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Field</th>
<th class="head">sysD.1</th>
<th class="head">sysM.1</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>identifier</td>
<td>sciD.1</td>
<td>sciM.1</td>
</tr>
<tr class="row-odd"><td>objectFormat</td>
<td>text/csv</td>
<td>eml://ecoinformatics.org/eml-2.1.0</td>
</tr>
<tr class="row-even"><td>size</td>
<td>1450238</td>
<td>8132</td>
</tr>
<tr class="row-odd"><td>submitter</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>rightsHolder</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>uid=jones,o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-odd"><td>obsoletes</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>obsoletedBy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>derivedFrom</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>describes</td>
<td> </td>
<td>sciD.1</td>
</tr>
<tr class="row-odd"><td>describedBy</td>
<td>sciM.1</td>
<td> </td>
</tr>
<tr class="row-even"><td>checksum</td>
<td>2e01e17467891f7c933dbaa00e1459d23db3fe4f</td>
<td>9967467891f7c933dbaa00e1459d23db3f342</td>
</tr>
<tr class="row-odd"><td>checksumAlgorithm</td>
<td>SHA-1</td>
<td>SHA-1</td>
</tr>
<tr class="row-even"><td>accessRule[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.ruleType</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Read</td>
<td>Read</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>*</td>
<td>*</td>
</tr>
<tr class="row-even"><td>accessRule[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.ruleType</td>
<td>Allow</td>
<td>Allow</td>
</tr>
<tr class="row-even"><td>.service</td>
<td>Write</td>
<td>Write</td>
</tr>
<tr class="row-odd"><td>.principal</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
<td>o=NCEAS,dc=ecoinformatics,dc=org</td>
</tr>
<tr class="row-even"><td>replicationPolicy</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.preferredMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-even"><td>.blockedMemberNode</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-odd"><td>.replicationAllowed</td>
<td>true</td>
<td>true</td>
</tr>
<tr class="row-even"><td>.numberReplicas</td>
<td>1</td>
<td>1</td>
</tr>
<tr class="row-odd"><td>dateUploaded</td>
<td>2010-03-04T18:13:51.0Z</td>
<td>2010-03-04T18:14:45.0Z</td>
</tr>
<tr class="row-even"><td>dateSysMetadataModified</td>
<td>2010-03-04T18:13:51.0Z</td>
<td>2010-03-04T18:14:45.0Z</td>
</tr>
<tr class="row-odd"><td>originMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-even"><td>authoritativeMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>replica[1]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn1.dataone.org</td>
<td>mn1.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td>2010-03-04T19:13:51.0Z</td>
<td>2010-03-04T19:13:52.0Z</td>
</tr>
<tr class="row-odd"><td>replica[2]</td>
<td> </td>
<td> </td>
</tr>
<tr class="row-even"><td>.replicaMemberNode</td>
<td>mn2.dataone.org</td>
<td>mn2.dataone.org</td>
</tr>
<tr class="row-odd"><td>.replicationStatus</td>
<td>Completed</td>
<td>Completed</td>
</tr>
<tr class="row-even"><td>.replicaVerified</td>
<td>2010-03-04T21:00:00.0Z</td>
<td>2010-03-04T21:00:00.0Z</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="conclusions">
<h2><a class="toc-backref" href="#id6">Conclusions</a><a class="headerlink" href="#conclusions" title="Permalink to this headline">¶</a></h2>
<p>Maintaining complete copies of system metadata on all nodes is cumbersome and
seems to be overly complicated. However, it is still necessary for Member Nodes
to provide accurate information for some elements of the system metadata (to
assist with transfer verification, to validate a data object is intact).</p>
<p>As such, it seems that scenario B above is the most tractable and provides the
desired functionality for tracking content in the DataONE infrastructure. The
role of system metadata on Member Nodes and Coordinating Nodes is further
clarified below.</p>
<p>The recommendations are:</p>
<ul class="simple">
<li>Complete, authoritative copies of system metadata are maintained on the
Coordinating Nodes.</li>
<li>A system metadata record becomes authoritative once the replicationStatus is
set to complete after initial transfer of content to the Coordinating Node
(step B5 above)</li>
<li>Member Nodes still provide access to system metadata through the
<code class="xref py py-func docutils literal"><span class="pre">MN_crud.getSystemMetadata()</span></code> calls, though the copy of system metadata
returned is authoritative for the properties controlled by the Member Nodes
only.</li>
<li>Member Nodes should not return any of the <code class="xref py py-attr docutils literal"><span class="pre">SystemMetdata.replica</span></code>
attributes.</li>
</ul>
</div>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Natural History of System Metadata</a><ul>
<li><a class="reference internal" href="#process-overview">Process Overview</a></li>
<li><a class="reference internal" href="#process-detail-scenario-a">Process Detail - Scenario A</a><ul>
<li><a class="reference internal" href="#step-a1">Step A1.</a></li>
<li><a class="reference internal" href="#step-a2">Step A2.</a></li>
<li><a class="reference internal" href="#step-a3">Step A3.</a></li>
<li><a class="reference internal" href="#step-a4">Step A4.</a></li>
<li><a class="reference internal" href="#step-a5">Step A5.</a></li>
<li><a class="reference internal" href="#step-a6">Step A6.</a></li>
<li><a class="reference internal" href="#step-a8">Step A8.</a></li>
</ul>
</li>
<li><a class="reference internal" href="#process-detail-scenario-b">Process Detail - Scenario B.</a><ul>
<li><a class="reference internal" href="#step-b1">Step B1.</a></li>
<li><a class="reference internal" href="#step-b2">Step B2.</a></li>
<li><a class="reference internal" href="#step-b3">Step B3.</a></li>
<li><a class="reference internal" href="#step-b4">Step B4.</a></li>
<li><a class="reference internal" href="#step-b5">Step B5.</a></li>
<li><a class="reference internal" href="#step-b6">Step B6.</a></li>
<li><a class="reference internal" href="#step-b7">Step B7.</a></li>
<li><a class="reference internal" href="#step-b8">Step B8.</a></li>
</ul>
</li>
<li><a class="reference internal" href="#final-state-of-system-metadata">Final State of System Metadata</a></li>
<li><a class="reference internal" href="#conclusions">Conclusions</a></li>
</ul>
</li>
</ul>
<h3>Related Topics</h3>
<ul>
<li><a href="../index.html">Documentation Overview</a><ul>
<li><a href="index.html"><no title></a><ul>
<li>Previous: <a href="SystemMetadataAnalysis.html" title="previous chapter">Getting a Handle on Systems Metadata for the Long Haul</a></li>
<li>Next: <a href="itk-analysis.html" title="next chapter">Analysis and Modeling Tools</a></li>
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