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From "Suhan Mao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12416) BlockPlacementPolicyDefault will cause NN shutdown if log level is changed
Date Mon, 11 Sep 2017 10:51:00 GMT

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

Suhan Mao updated HDFS-12416:
-----------------------------
    Attachment: HDFS-12416.patch

> 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
>         Attachments: 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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