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https://issues.apache.org/jira/browse/HBASE-2398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852170#action_12852170
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Nicolas Spiegelberg commented on HBASE-2398:
--------------------------------------------

Just triggers a log roll.  The current code snippet (which will remain 
unchanged) is

      if (listener != null) {
        listener.logRollRequested();
      }


> NPE in HLog.append when calling writer.getLength
> ------------------------------------------------
>
>                 Key: HBASE-2398
>                 URL: https://issues.apache.org/jira/browse/HBASE-2398
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>            Assignee: Kannan Muthukkaruppan
>             Fix For: 0.20.4, 0.21.0
>
>
> Doing some test uploads on a fresh single node setup, I'm seeing non-fatal 
> NPEs in the region server log coming from HLog.append when calling 
> writer.getLength. I'll post a log in a follow-up comment.
> Assigning to Nicolas so that he takes a look.

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