[HBASE-24713] RS startup with FSHLog throws NPE after HBASE-21751 - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Minor
Resolution: Fixed
Affects Version/s: 2.1.6
Fix Version/s: 3.0.0-alpha-1, 2.3.1, 2.4.0, 2.2.6
Component/s: wal
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Description

Every RS startup creates this NPE

[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

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 handle Throwable Exception. It will good to solve this.