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https://issues.apache.org/jira/browse/HBASE-19870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16342383#comment-16342383
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Duo Zhang commented on HBASE-19870:
-----------------------------------
You can see the code in testNotCloseZkWhenPending? Create a spy, and sleep in
the mocked method before calling the real method.
> Fix the NPE in ReadOnlyZKClient#run
> -----------------------------------
>
> Key: HBASE-19870
> URL: https://issues.apache.org/jira/browse/HBASE-19870
> Project: HBase
> Issue Type: Sub-task
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Major
> Fix For: 2.0.0-beta-2
>
> Attachments: HBASE-19870.v1.patch
>
>
> I notice a NPE from my jenkins.
> {code}
> 2018-01-26 17:26:41,078 DEBUG [M:0;8546d406e429:40557-EventThread]
> zookeeper.ZKWatcher(443): replicationLogCleaner-0x161337ddc090004,
> quorum=localhost:56060, baseZNode=/hbase Received ZooKeeper Event, type=None,
> state=Disconnected, path=null
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.zookeeper.ReadOnlyZKClient.run(ReadOnlyZKClient.java:322)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> If any zk task invokes the #onComplete late, the count of current requests
> will not zero and then the null from task queue will destroy the work thread
> in ReadOnlyZKClient.
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