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Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (Jira)" <ji...@apache.org> on 2020/07/10 10:54:00 UTC

[jira] [Created] (HBASE-24713) RS startup with FSHLog throws NPE after HBASE-21751

ramkrishna.s.vasudevan created HBASE-24713:
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             Summary: RS startup with FSHLog throws NPE after HBASE-21751
                 Key: HBASE-24713
                 URL: https://issues.apache.org/jira/browse/HBASE-24713
             Project: HBase
          Issue Type: Bug
          Components: wal
    Affects Versions: 2.1.6
            Reporter: ramkrishna.s.vasudevan
            Assignee: ramkrishna.s.vasudevan


Every RS startup creates this NPE
{code}
[sync.1] wal.FSHLog: UNEXPECTED
java.lang.NullPointerException
        at org.apache.hadoop.hbase.regionserver.wal.FSHLog$SyncRunner.run(FSHLog.java:582)
        at java.lang.Thread.run(Thread.java:748)
2020-07-07 10:51:23,208 WARN  [regionserver/xxxxx:16020] wal.FSHLog: Failed sync-before-close but no outstanding appends; closing WALjava.lang.NullPointerException
{code}
the reason is that the Disruptor frameworks starts the Syncrunner thread but the init of the writer happens after that. A simple null check in the Syncrunner will help here .
No major damage happens though since we are handle Throwable Exception. It will good to solve this. 



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