/solr/admin/metrics fails when there are transient cores

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/solr/admin/metrics fails when there are transient cores

nandakishorek
My environment is as follows
 * Solr 7.2.1 in standalone mode.
 * 32GB heap
 * 150 cores with data getting continuously ingested to ~10 cores and all of
the cores queried.
 * transient cache size is set to 30.

The solr.xml is as follows
<?xml version="1.0" encoding="UTF-8" ?>
<solr>

  <int name="transientCacheSize">32</int>
  <str name="shareSchema">true</str>
  <str name="configSetBaseDir">${configSetBaseDir:configsets}</str>

  <shardHandlerFactory name="shardHandlerFactory"
                       class="HttpShardHandlerFactory">
    <int name="socketTimeout">${socketTimeout:600000}</int>
    <int name="connTimeout">${connTimeout:60000}</int>
  </shardHandlerFactory>
</solr>

I get the following error when I request for "/solr/admin/metrics".
{
    "responseHeader": {
        "status": 500,
        "QTime": 31
    },
    "error": {
        "msg": "Already closed",
        "trace": "org.apache.lucene.store.AlreadyClosedException: Already
closed\n\tat
org.apache.solr.core.CachingDirectoryFactory.get(CachingDirectoryFactory.java:337)\n\tat
org.apache.solr.core.SolrCore.getNewIndexDir(SolrCore.java:351)\n\tat
org.apache.solr.core.SolrCore.getIndexDir(SolrCore.java:330)\n\tat
org.apache.solr.handler.ReplicationHandler.lambda$initializeMetrics$5(ReplicationHandler.java:849)\n\tat
org.apache.solr.util.stats.MetricUtils.convertGauge(MetricUtils.java:488)\n\tat
org.apache.solr.util.stats.MetricUtils.convertMetric(MetricUtils.java:274)\n\tat
org.apache.solr.util.stats.MetricUtils.lambda$toMaps$4(MetricUtils.java:213)\n\tat
java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)\n\tat
java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)\n\tat
java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)\n\tat
java.util.TreeMap$KeySpliterator.forEachRemaining(TreeMap.java:2746)\n\tat
java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)\n\tat
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)\n\tat
java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)\n\tat
java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)\n\tat
java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)\n\tat
java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)\n\tat
org.apache.solr.util.stats.MetricUtils.toMaps(MetricUtils.java:211)\n\tat
org.apache.solr.handler.admin.MetricsHandler.handleRequestBody(MetricsHandler.java:108)\n\tat
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:177)\n\tat
org.apache.solr.servlet.HttpSolrCall.handleAdmin(HttpSolrCall.java:735)\n\tat
org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:716)\n\tat
org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:497)\n\tat
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:382)\n\tat
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:326)\n\tat
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1751)\n\tat
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)\n\tat
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)\n\tat
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)\n\tat
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)\n\tat
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)\n\tat
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)\n\tat
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)\n\tat
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)\n\tat
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)\n\tat
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)\n\tat
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)\n\tat
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)\n\tat
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)\n\tat
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)\n\tat
org.eclipse.jetty.server.Server.handle(Server.java:534)\n\tat
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)\n\tat
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)\n\tat
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)\n\tat
org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108)\n\tat
org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)\n\tat
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)\n\tat
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)\n\tat
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)\n\tat
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)\n\tat
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)\n\tat
java.lang.Thread.run(Thread.java:748)\n",
        "code": 500
    }
}
 

I validated that this problem happens on the default configset as well (no
changes other than transientCacheSize).

Debugger shows that the *getIndexDir()* fails on a core which is unloaded. I
confirmed that by checking "isLoaded" property in STATUS output for the
core.

I have raised a Jira for this problem.
https://issues.apache.org/jira/browse/SOLR-12541



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