Andrzej Bialecki created SOLR-14450:
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Summary: SegmentsInfoRequestHandler doesn't properly close
ref-counted IW
Key: SOLR-14450
URL: https://issues.apache.org/jira/browse/SOLR-14450
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 8.5
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
As reported on the mailing list by Tiziano Degaetano:
I’m digging in an issue getting timeouts doing a managed schema change using
the schema api.
The call hangs reloading the cores (does not recover until restarting the
node):
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireNanos(Unknown
Source)
java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireNanos(Unknown
Source)
java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.tryLock(Unknown
Source)
org.apache.solr.update.DefaultSolrCoreState.lock(DefaultSolrCoreState.java:179)
org.apache.solr.update.DefaultSolrCoreState.newIndexWriter(DefaultSolrCoreState.java:230)
org.apache.solr.core.SolrCore.reload(SolrCore.java:696)
org.apache.solr.core.CoreContainer.reload(CoreContainer.java:1558)
org.apache.solr.schema.SchemaManager.doOperations(SchemaManager.java:133)
org.apache.solr.schema.SchemaManager.performOperations(SchemaManager.java:92)
org.apache.solr.handler.SchemaHandler.handleRequestBody(SchemaHandler.java:90)
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:211)
org.apache.solr.core.SolrCore.execute(SolrCore.java:2596)
org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:802)
org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:579)
After a while I realized it was only deadlocked, after I used the AdminUI to
view the segments info of the core.
So my question: is this line correct? If withCoreInfo is false iwRef.decref()
will not be called to release the reader lock, preventing any further writer
locks.
[https://github.com/apache/lucene-solr/blob/3a743ea953f0ecfc35fc7b198f68d142ce99d789/solr/core/src/java/org/apache/solr/handler/admin/SegmentsInfoRequestHandler.java#L144]
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