[jira] [Created] (HBASE-19870) Fix the NEP in ReadOnlyZKClient#run

["Chia-Ping Tsai (JIRA)" <ji...@apache.org>]

Chia-Ping Tsai created HBASE-19870:
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             Summary: Fix the NEP 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


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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