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<div class="section" id="coordinating-node-requirements">
<h1>Coordinating Node Requirements<a class="headerlink" href="#coordinating-node-requirements" title="Permalink to this headline">¶</a></h1>
<p>This list of requirements for Coordinating Node functionality was developed
during a brainstorming session at the 20090602 ABQ VDC-TWG meeting.</p>
<div class="admonition-todo admonition" id="index-0">
<p class="first admonition-title">Todo</p>
<p class="last">Estimate some times for the unknowns here.</p>
</div>
<ul class="simple">
<li>IDs not discoverable until all CNs have confirmed copy</li>
<li>Metadata searches return in max xxx secs</li>
<li>CN can store and search > xxx metadata records</li>
<li>CN can store and search multiple metadata standards
- specifically (list Metadata_formats_of_interest.txt)</li>
<li>CN can load-balance to maximize performance</li>
<li>Any xxx CNs can be offline without affecting D1 services</li>
<li>xxx concurrent transactions can be supported
- different for different types of transaction e.g. delete vs. insert</li>
<li>Each CN should be available xxx% time</li>
<li>CN should expose MD in search within xxx secs of insert by MN</li>
<li>CN services should be designed to be independently scalable</li>
<li>CN services should be geographically replicated</li>
<li>CN have complete metadata copies from all MNs</li>
<li>D1 should be TRAC and/or DRAMBORA trusted repositories</li>
<li>CN should respect replication policies of MNs</li>
<li>CN should ensure that any given data set is available at any time (subject
to policy restrictions) even when xxx% of MNs are offline</li>
<li>CNs must validate that:
- data are available at all replicas
- replicas are valid</li>
<li>CNs ensure that data are available in current formats (data format upgrade?)</li>
<li>CNs should be economical to run and maintain</li>
<li>CNs should be able to be remotely administered</li>
<li>CNs should be secure and deflect malicious intent</li>
<li>CNs should provide services to detect rogue data (viruses, copyright, )</li>
</ul>
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