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

["Anoop Sam John (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-24713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169726#comment-17169726 ] 

Anoop Sam John commented on HBASE-24713:
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branch-2?

> 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
>             Fix For: 3.0.0-alpha-1, 2.3.1, 2.2.6
>
>
> 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 handle Throwable Exception. It will good to solve this. 



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