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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8993) Balancer throws NPE
Date Sat, 29 Aug 2015 08:35:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14721019#comment-14721019
] 

Brahma Reddy Battula commented on HDFS-8993:
--------------------------------------------

HI [~hexiaoqiao] , this is dupe of HDFS-8992..?

> Balancer throws NPE
> -------------------
>
>                 Key: HDFS-8993
>                 URL: https://issues.apache.org/jira/browse/HDFS-8993
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>    Affects Versions: 2.4.1
>            Reporter: He Xiaoqiao
>
> Balancer may throw NPE because the following {{if Statements}} at line 709 of Balancer.java
> {code:title=Balancer.java}
>     synchronized (block) {
>       // update locations
>       for (String datanodeUuid : blk.getDatanodeUuids()) {
>         final BalancerDatanode d = datanodeMap.get(datanodeUuid);
>         if (datanode != null) { // not an unknown datanode
>           block.addLocation(d);
>         }
>       }
>     }
> {code}
> Before moving block, Balancer divides into two step to get all DNs info & some blocks
of DN from NN. Regarding one DN commission after {{getDatanodeReport}} then {{getBlockList}}
and one block's target is above DN just right, It will throw NPE when dispatcher.



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