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https://issues.apache.org/jira/browse/HDFS-15115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ayush Saxena updated HDFS-15115:
--------------------------------
    Fix Version/s: 3.2.2
                   3.3.0
     Hadoop Flags: Reviewed
       Resolution: Fixed
           Status: Resolved  (was: Patch Available)

> Namenode crash caused by NPE in BlockPlacementPolicyDefault when dynamically 
> change logger to debug
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-15115
>                 URL: https://issues.apache.org/jira/browse/HDFS-15115
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: wangzhixiang
>            Assignee: wangzhixiang
>            Priority: Major
>             Fix For: 3.3.0, 3.2.2
>
>         Attachments: HDFS-15115.001.patch, HDFS-15115.003.patch, 
> HDFS-15115.004.patch, HDFS-15115.005.patch, HDFS-15115.2.patch
>
>
> To get debug info, we dynamically change the logger of 
> BlockPlacementPolicyDefault to debug when namenode is running. However, the 
> Namenode crashs. From the log, we find some NPE in 
> BlockPlacementPolicyDefault.chooseRandom. Because *StringBuilder builder* 
> will be used 4 times in BlockPlacementPolicyDefault.chooseRandom method. 
> While the *builder* only initializes in the first time of this method. If we 
> change the logger of BlockPlacementPolicyDefault to debug after the part, the 
> *builder* in remaining part is *NULL* and cause *NPE*



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