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https://issues.apache.org/jira/browse/YARN-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15304102#comment-15304102
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Hudson commented on YARN-4987:
------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #9876 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9876/])
YARN-4987. Read cache concurrency issue between read and evict in (junping_du:
rev 705286ccaeea36941d97ec1c1700746b74264924)
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/test/java/org/apache/hadoop/yarn/server/timeline/TestEntityGroupFSTimelineStore.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/main/java/org/apache/hadoop/yarn/server/timeline/EntityGroupFSTimelineStore.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/test/java/org/apache/hadoop/yarn/server/timeline/EntityGroupPlugInForTest.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/main/java/org/apache/hadoop/yarn/server/timeline/EntityCacheItem.java
> Read cache concurrency issue between read and evict in EntityGroupFS timeline
> store
> ------------------------------------------------------------------------------------
>
> Key: YARN-4987
> URL: https://issues.apache.org/jira/browse/YARN-4987
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Li Lu
> Assignee: Li Lu
> Priority: Critical
> Fix For: 2.8.0
>
> Attachments: YARN-4987-trunk.001.patch, YARN-4987-trunk.002.patch,
> YARN-4987-trunk.003.patch, YARN-4987-trunk.004.patch
>
>
> To handle concurrency issues, key value based timeline storage may return
> null on reads that are concurrent to service stop. This is actually caused by
> a concurrency issue between cache reads and evicts. Specifically, if the
> storage is being read when it gets evicted, the storage may turn into null.
> EntityGroupFS timeline store needs to handle this case gracefully.
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