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https://issues.apache.org/jira/browse/HBASE-24713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan reassigned HBASE-24713:
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Assignee: Gaurav Kanade (was: ramkrishna.s.vasudevan)
> 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: Gaurav Kanade
> Priority: Minor
>
> 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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