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https://issues.apache.org/jira/browse/SOLR-15254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17602353#comment-17602353
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Michael Gibney commented on SOLR-15254:
---------------------------------------
[~markrmiller], I'm curious about your assertion:
{quote}Often these static init issues just manifest as “slowness” but can also
full on deadlock if you hit the lottery
{quote}
As far as I can make sense of this, it would either manifest as full-on
deadlock, or would appear to work just fine (i.e., no "slowness"). If you have
a moment, could you describe how this could manifest in slowness (as opposed to
deadlock)?
> Random deadlock during cores initialization
> -------------------------------------------
>
> Key: SOLR-15254
> URL: https://issues.apache.org/jira/browse/SOLR-15254
> Project: Solr
> Issue Type: Bug
> Affects Versions: 8.5.1
> Environment: openjdk 11.0.9.1
> Reporter: Thomas Mortagne
> Priority: Major
>
> At XWiki we are using Solr in an embbedded way with 5 cores, and sometimes we
> end up with what appears to be a race condition leading to a deadlock between
> several of the cores's configuration loading while loading some required
> classes.
> Here is an extract of a thread dump (also attached is a more complete version
> of the thread dump) we get in such a case:
> {noformat}
> "coreLoadExecutor-9-thread-1" #41 prio=5 os_prio=0 cpu=305.06ms
> elapsed=101.24s tid=0x00007fb5cfc8f800 nid=0x57a in Object.wait()
> [0x00007fb5717ec000]
> java.lang.Thread.State: RUNNABLE
> at java.lang.Class.forName0([email protected]/Native Method)
> at java.lang.Class.forName([email protected]/Class.java:398)
> at
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:554)
> at
> org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:639)
> at
> org.apache.solr.schema.FieldTypePluginLoader$3.create(FieldTypePluginLoader.java:339)
> at
> org.apache.solr.schema.FieldTypePluginLoader$3.create(FieldTypePluginLoader.java:332)
> at
> org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:152)
> at
> org.apache.solr.schema.FieldTypePluginLoader.readAnalyzer(FieldTypePluginLoader.java:356)
> at
> org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:90)
> at
> org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:48)
> at
> org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:152)
> at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:502)
> at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:178)
> at
> org.apache.solr.schema.ManagedIndexSchema.<init>(ManagedIndexSchema.java:105)
> at
> org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:178)
> at
> org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:46)
> at
> org.apache.solr.core.ConfigSetService.createIndexSchema(ConfigSetService.java:145)
> at
> org.apache.solr.core.ConfigSetService.loadConfigSet(ConfigSetService.java:83)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1302)
> at
> org.apache.solr.core.CoreContainer.lambda$load$13(CoreContainer.java:802)
> at
> org.apache.solr.core.CoreContainer$$Lambda$569/0x0000000840bc7040.call(Unknown
> Source)
> at
> org.glowroot.agent.plugin.executor.CallableWrapper.call(CallableWrapper.java:38)
> at
> com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:202)
> at
> java.util.concurrent.FutureTask.run([email protected]/FutureTask.java:264)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:210)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$$Lambda$438/0x0000000840b29440.run(Unknown
> Source)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
> at java.lang.Thread.run([email protected]/Thread.java:834)
> "coreLoadExecutor-9-thread-3" #43 prio=5 os_prio=0 cpu=294.37ms
> elapsed=101.24s tid=0x00007fb5cfcdf800 nid=0x57c in Object.wait()
> [0x00007fb5715ea000]
> java.lang.Thread.State: RUNNABLE
> at java.lang.Class.forName0([email protected]/Native Method)
> at java.lang.Class.forName([email protected]/Class.java:398)
> at
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:554)
> at
> org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:639)
> at
> org.apache.solr.schema.FieldTypePluginLoader$3.create(FieldTypePluginLoader.java:339)
> at
> org.apache.solr.schema.FieldTypePluginLoader$3.create(FieldTypePluginLoader.java:332)
> at
> org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:152)
> at
> org.apache.solr.schema.FieldTypePluginLoader.readAnalyzer(FieldTypePluginLoader.java:356)
> at
> org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:90)
> at
> org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:48)
> at
> org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:152)
> at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:502)
> at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:178)
> at
> org.apache.solr.schema.ManagedIndexSchema.<init>(ManagedIndexSchema.java:105)
> at
> org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:178)
> at
> org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:46)
> at
> org.apache.solr.core.ConfigSetService.createIndexSchema(ConfigSetService.java:145)
> at
> org.apache.solr.core.ConfigSetService.loadConfigSet(ConfigSetService.java:83)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1302)
> at
> org.apache.solr.core.CoreContainer.lambda$load$13(CoreContainer.java:802)
> at
> org.apache.solr.core.CoreContainer$$Lambda$569/0x0000000840bc7040.call(Unknown
> Source)
> at
> org.glowroot.agent.plugin.executor.CallableWrapper.call(CallableWrapper.java:38)
> at
> com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:202)
> at
> java.util.concurrent.FutureTask.run([email protected]/FutureTask.java:264)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:210)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$$Lambda$438/0x0000000840b29440.run(Unknown
> Source)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
> at java.lang.Thread.run([email protected]/Thread.java:834)
> "coreLoadExecutor-9-thread-2" #42 prio=5 os_prio=0 cpu=388.81ms
> elapsed=101.24s tid=0x00007fb5cfcde800 nid=0x57b in Object.wait()
> [0x00007fb5716eb000]
> java.lang.Thread.State: RUNNABLE
> at
> jdk.internal.misc.Unsafe.ensureClassInitialized0([email protected]/Native
> Method)
> at
> jdk.internal.misc.Unsafe.ensureClassInitialized([email protected]/Unsafe.java:1042)
> at
> jdk.internal.reflect.UnsafeFieldAccessorFactory.newFieldAccessor([email protected]/UnsafeFieldAccessorFactory.java:43)
> at
> jdk.internal.reflect.ReflectionFactory.newFieldAccessor([email protected]/ReflectionFactory.java:186)
> at
> java.lang.reflect.Field.acquireFieldAccessor([email protected]/Field.java:1105)
> at
> java.lang.reflect.Field.getFieldAccessor([email protected]/Field.java:1086)
> at java.lang.reflect.Field.get([email protected]/Field.java:418)
> at
> org.apache.lucene.analysis.util.AbstractAnalysisFactory.lookupSPIName(AbstractAnalysisFactory.java:358)
> at
> org.apache.lucene.analysis.util.AnalysisSPILoader.reload(AnalysisSPILoader.java:90)
> - locked <0x00000000e98e20a0> (a
> org.apache.lucene.analysis.util.AnalysisSPILoader)
> at
> org.apache.lucene.analysis.util.AnalysisSPILoader.<init>(AnalysisSPILoader.java:66)
> at
> org.apache.lucene.analysis.util.AnalysisSPILoader.<init>(AnalysisSPILoader.java:52)
> at
> org.apache.lucene.analysis.util.TokenFilterFactory.<clinit>(TokenFilterFactory.java:33)
> at
> org.apache.solr.core.SolrResourceLoader.reloadLuceneSPI(SolrResourceLoader.java:256)
> at
> org.apache.solr.core.SolrResourceLoader.<init>(SolrResourceLoader.java:196)
> at
> org.apache.solr.core.ConfigSetService$Standalone.createCoreResourceLoader(ConfigSetService.java:207)
> at
> org.apache.solr.core.ConfigSetService.loadConfigSet(ConfigSetService.java:66)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1302)
> at
> org.apache.solr.core.CoreContainer.lambda$load$13(CoreContainer.java:802)
> at
> org.apache.solr.core.CoreContainer$$Lambda$569/0x0000000840bc7040.call(Unknown
> Source)
> at
> org.glowroot.agent.plugin.executor.CallableWrapper.call(CallableWrapper.java:38)
> at
> com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:202)
> at
> java.util.concurrent.FutureTask.run([email protected]/FutureTask.java:264)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:210)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$$Lambda$438/0x0000000840b29440.run(Unknown
> Source)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
> at java.lang.Thread.run([email protected]/Thread.java:834)
> "main" #1 prio=5 os_prio=0 cpu=25108.09ms elapsed=133.50s
> tid=0x00007fb5cc018800 nid=0x541 waiting on condition [0x00007fb5d2f73000]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
> - parking to wait for <0x00000000ea480000> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at
> java.util.concurrent.locks.LockSupport.parkNanos([email protected]/LockSupport.java:234)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos([email protected]/AbstractQueuedSynchronizer.java:2123)
> at
> java.util.concurrent.ThreadPoolExecutor.awaitTermination([email protected]/ThreadPoolExecutor.java:1454)
> at
> com.codahale.metrics.InstrumentedExecutorService.awaitTermination(InstrumentedExecutorService.java:163)
> at
> org.apache.solr.common.util.ExecutorUtil.awaitTermination(ExecutorUtil.java:85)
> at
> org.apache.solr.common.util.ExecutorUtil.shutdownAndAwaitTermination(ExecutorUtil.java:77)
> at org.apache.solr.core.CoreContainer.load(CoreContainer.java:843)
> "h2sc-4-thread-1" #38 prio=5 os_prio=0 cpu=0.20ms elapsed=101.89s
> tid=0x00007fb5cfc16800 nid=0x577 runnable [0x00007fb571cf0000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.EPoll.wait([email protected]/Native Method)
> at
> sun.nio.ch.EPollSelectorImpl.doSelect([email protected]/EPollSelectorImpl.java:120)
> at
> sun.nio.ch.SelectorImpl.lockAndDoSelect([email protected]/SelectorImpl.java:124)
> - locked <0x00000000e9819cf0> (a sun.nio.ch.Util$2)
> - locked <0x00000000e9819c98> (a sun.nio.ch.EPollSelectorImpl)
> at
> sun.nio.ch.SelectorImpl.select([email protected]/SelectorImpl.java:141)
> at
> org.eclipse.jetty.io.ManagedSelector.nioSelect(ManagedSelector.java:149)
> at org.eclipse.jetty.io.ManagedSelector.select(ManagedSelector.java:156)
> at
> org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:572)
> at
> org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:509)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produceTask(EatWhatYouKill.java:360)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:184)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:135)
> at
> org.eclipse.jetty.io.ManagedSelector$$Lambda$437/0x0000000840b28c40.run(Unknown
> Source)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:210)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$$Lambda$438/0x0000000840b29440.run(Unknown
> Source)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
> at java.lang.Thread.run([email protected]/Thread.java:834)
> {noformat}
> Notice the coreLoadExecutor-9-thread-* thread which despite their "RUNNABLE"
> state are actually internally blocked waiting on some unknown object. The
> main thread is stuck because it's waiting for the cores's initialization to
> finish.
> I included "h2sc-4-thread-1" to have all the threads doing stuff but it does
> not seems to have much to do with the deadlock (other than being a Solr thing
> too).
> It's not very easy to debug since we cannot always reproduce but maybe you
> guys have a clue for where this issue might be comming from based on those
> informations.
> When we hit this problem we can "workaround" it by restarting a few times
> until it pass the Solr init.
> We never had this issue back when we only had 1 or 2 cores but having 5 of
> those is very recent for us so I cannot really tell if it's some recent Solr
> regression or an old bug we did not had before because we did not had enough
> cores to trigger it.
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