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https://issues.apache.org/jira/browse/HIVE-20192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552501#comment-16552501
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ASF GitHub Bot commented on HIVE-20192:
---------------------------------------
Github user sankarh closed the pull request at:
https://github.com/apache/hive/pull/402
> HS2 with embedded metastore is leaking JDOPersistenceManager objects.
> ---------------------------------------------------------------------
>
> Key: HIVE-20192
> URL: https://issues.apache.org/jira/browse/HIVE-20192
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 3.0.0, 3.1.0, 4.0.0
> Reporter: Sankar Hariappan
> Assignee: Sankar Hariappan
> Priority: Major
> Labels: HiveServer2, pull-request-available
> Fix For: 4.0.0
>
> Attachments: HIVE-20192.01.patch, HIVE-20192.02.patch
>
>
> Hiveserver2 instances where crashing every 3-4 days and observed HS2 in on
> unresponsive state. Also, observed that the FGC collection happening regularly
> From JXray report it is seen that pmCache(List of JDOPersistenceManager
> objects) is occupying 84% of the heap and there are around 16,000 references
> of UDFClassLoader.
> {code:java}
> 10,759,230K (84.7%) Object tree for GC root(s) Java Static
> org.apache.hadoop.hive.metastore.ObjectStore.pmf
> - org.datanucleus.api.jdo.JDOPersistenceManagerFactory.pmCache ↘ 10,744,419K
> (84.6%), 1 reference(s)
> - j.u.Collections$SetFromMap.m ↘ 10,744,419K (84.6%), 1 reference(s)
> - {java.util.concurrent.ConcurrentHashMap}.keys ↘ 10,743,764K (84.5%),
> 16,872 reference(s)
> - org.datanucleus.api.jdo.JDOPersistenceManager.ec ↘ 10,738,831K
> (84.5%), 16,872 reference(s)
> ... 3 more references together retaining 4,933K (< 0.1%)
> - java.util.concurrent.ConcurrentHashMap self 655K (< 0.1%), 1 object(s)
> ... 2 more references together retaining 48b (< 0.1%)
> - org.datanucleus.api.jdo.JDOPersistenceManagerFactory.nucleusContext ↘
> 14,810K (0.1%), 1 reference(s)
> ... 3 more references together retaining 96b (< 0.1%){code}
> When the RawStore object is re-created, it is not allowed to be updated into
> the ThreadWithGarbageCleanup.threadRawStoreMap which leads to the new
> RawStore never gets cleaned-up when the thread exit.
>
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