[jira] [Updated] (HDFS-12416) BlockPlacementPolicyDefault will cause NN shutdown if log level is changed

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-12416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei-Chiu Chuang updated HDFS-12416:
-----------------------------------
    Resolution: Duplicate
        Status: Resolved  (was: Patch Available)

Thanks [~brahmareddy] resolve this as a dup. Thanks [~smao].

> BlockPlacementPolicyDefault will cause NN shutdown if log level is changed
> --------------------------------------------------------------------------
>
>                 Key: HDFS-12416
>                 URL: https://issues.apache.org/jira/browse/HDFS-12416
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: block placement
>    Affects Versions: 2.7.4, 3.0.0-alpha3
>            Reporter: Suhan Mao
>            Priority: Major
>         Attachments: HDFS-12416.001.patch, HDFS-12416.patch
>
>   Original Estimate: 5h
>  Remaining Estimate: 5h
>
> In BlockPlacementPolicyDefault.chooseRandom method.
> The code are in below structure:
> {code:java}
> StringBuilder builder = null;
>     if (LOG.isDebugEnabled()) {
>       builder = debugLoggingBuilder.get();
>       builder.setLength(0);
>       builder.append("[");
>     }
> while(numOfReplicas > 0){
> .............
> chooseDataNode(scope, excludedNodes)
> .............
> if (LOG.isDebugEnabled()) {
>         builder.append("\nNode ").append(NodeBase.getPath(chosenNode))
>             .append(" [");
>       }
> }
> {code}
> There's a possibility that the loglevel is INFO before entering while loop, but the loglevel is changed to DEBUG inside the loop through web UI.
> In that case, builder is not initialized in the beginning and NullPointerException will throw and this will cause NN exiting.



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