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Add notes for 2020-12

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Alan Orth
2020-12-06 16:53:29 +02:00
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<meta property="og:title" content="December, 2020" />
<meta property="og:description" content="2020-12-01
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<meta property="og:url" content="https://alanorth.github.io/cgspace-notes/2020-12/" />
<meta property="article:published_time" content="2020-12-01T11:32:54+02:00" />
<meta property="article:modified_time" content="2020-12-01T11:32:54+02:00" />
<meta property="article:modified_time" content="2020-12-01T19:15:48+02:00" />
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<meta name="twitter:title" content="December, 2020"/>
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"headline": "December, 2020",
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"dateModified": "2020-12-01T19:15:48+02:00",
"author": {
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"name": "Alan Orth"
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</ul>
</li>
</ul>
<h2 id="2020-12-02">2020-12-02</h2>
<ul>
<li>Udana emailed me yesterday to ask why the CGSpace usage statistics were showing &ldquo;No Data&rdquo;
<ul>
<li>I noticed a message in the Solr Admin UI that one of the statistics cores failed to load, but it is up and I can query it&hellip;</li>
<li>Nevertheless, I restarted Tomcat a few times to see if all cores would come up without an error message, but had no success (despite that all cores ARE up and I can query them, <em>sigh</em>)</li>
<li>I think I will move all the Solr yearly statistics back into the main statistics core</li>
</ul>
</li>
<li>Start testing export/import of yearly Solr statistics data into the main statistics core on DSpace Test, for example:</li>
</ul>
<pre><code>$ ./run.sh -s http://localhost:8081/solr/statistics-2010 -a export -o statistics-2010.json -k uid
$ ./run.sh -s http://localhost:8081/solr/statistics -a import -o statistics-2010.json -k uid
$ curl -s &quot;http://localhost:8081/solr/statistics-2010/update?softCommit=true&quot; -H &quot;Content-Type: text/xml&quot; --data-binary &quot;&lt;delete&gt;&lt;query&gt;*:*&lt;/query&gt;&lt;/delete&gt;&quot;
</code></pre><ul>
<li>I deployed Tomcat 7.0.107 on DSpace Test (CGSpace is still Tomcat 7.0.104)</li>
<li>I finished migrating all the statistics from the yearly shards back to the main core</li>
</ul>
<h2 id="2020-12-05">2020-12-05</h2>
<ul>
<li>I deleted all the yearly statistics shards and restarted Tomcat on DSpace Test (linode26)</li>
</ul>
<h2 id="2020-12-06">2020-12-06</h2>
<ul>
<li>Looking into the statistics on DSpace Test after I migrated them back to the main core
<ul>
<li>All stats are working as expected&hellip; indexing time for the DSpace Statistics API is the same&hellip; and I don&rsquo;t even see a difference in the JVM or memory stats in Munin other than a minor jump last week when I was processing them</li>
</ul>
</li>
<li>I will migrate them on CGSpace too I think
<ul>
<li>First I will start with the statistics-2010 and statistics-2015 cores because they were the ones that were failing to load recently (despite actually being available in Solr WTF)</li>
</ul>
</li>
</ul>
<p><img src="/cgspace-notes/2020/12/solr-statistics-2010-failed.png" alt="Error message in Solr admin UI about the statistics-2010 core failing to load"></p>
<ul>
<li>First the 2010 core:</li>
</ul>
<pre><code class="language-console" data-lang="console">$ chrt -b 0 ./run.sh -s http://localhost:8081/solr/statistics-2010 -a export -o statistics-2010.json -k uid
$ chrt -b 0 ./run.sh -s http://localhost:8081/solr/statistics -a import -o statistics-2010.json -k uid
$ curl -s &quot;http://localhost:8081/solr/statistics-2010/update?softCommit=true&quot; -H &quot;Content-Type: text/xml&quot; --data-binary &quot;&lt;delete&gt;&lt;query&gt;*:*&lt;/query&gt;&lt;/delete&gt;&quot;
</code></pre><ul>
<li>Judging by the DSpace logs all these cores had a problem starting up in the last month:</li>
</ul>
<pre><code class="language-console" data-lang="console"># grep -rsI &quot;Unable to create core&quot; [dspace]/log/dspace.log.2020-* | grep -o -E &quot;statistics-[0-9]+&quot; | sort | uniq -c
24 statistics-2010
24 statistics-2015
18 statistics-2016
6 statistics-2018
</code></pre><ul>
<li>The message is always this:</li>
</ul>
<pre><code>org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Error CREATEing SolrCore 'statistics-2016': Unable to create core [statistics-2016] Caused by: Lock obtain timed out: NativeFSLock@/[dspace]/solr/statistics-2016/data/index/write.lock
</code></pre><ul>
<li>I will migrate all these cores and see if it makes a difference, then probably end up migrating all of them
<ul>
<li>I removed the statistics-2010, statistics-2015, statistics-2016, and statistics-2018 cores and restarted Tomcat and <em>all the statistics cores came up OK and the CUA statistics are OK</em>!</li>
</ul>
</li>
</ul>
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