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Date: Fri, 21 Jul 2017 03:20:00 +0000 (UTC)
From: "Brahma Reddy Battula (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13088950.1500605459000.298924.1500607200157@Atlassian.JIRA>
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References: <JIRA.13088950.1500605459000@Atlassian.JIRA> <JIRA.13088950.1500605459154@jira-lw-us.apache.org>
Subject: [jira] [Assigned] (HDFS-12177) NameNode exits due to  setting
 BlockPlacementPolicy loglevel to Debug
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archived-at: Fri, 21 Jul 2017 03:20:07 -0000


     [ https://issues.apache.org/jira/browse/HDFS-12177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brahma Reddy Battula reassigned HDFS-12177:
-------------------------------------------

    Assignee: Jiandan Yang 

> NameNode exits due to  setting BlockPlacementPolicy loglevel to Debug
> ---------------------------------------------------------------------
>
>                 Key: HDFS-12177
>                 URL: https://issues.apache.org/jira/browse/HDFS-12177
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: block placement
>    Affects Versions: 2.8.1
>            Reporter: Jiandan Yang 
>            Assignee: Jiandan Yang 
>         Attachments: HDFS_9668_1.patch
>
>
> NameNode exits because the ReplicationMonitor thread internally throws NPE.
> The reason for throwing NPE is that the builder field is not initialized whe do log.
> Solution: before appending it should determine whether the builder is null
> {code:java}
> if (LOG.isDebugEnabled()) {
>   builder = debugLoggingBuilder.get();
>   builder.setLength(0);
>   builder.append("[");
> }
> some other codes ...
> if (LOG.isDebugEnabled()) {
>   builder.append("\nNode ").append(NodeBase.getPath(chosenNode))
>       .append(" [");
> }
> some other codes ...
> if (LOG.isDebugEnabled()) {
>   builder.append("\n]");
> }
> {code}
> NN exception log is :
> {code:java}
> java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRandom(BlockPlacementPolicyDefault.java:722)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRandom(BlockPlacementPolicyDefault.java:689)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseFromNextRack(BlockPlacementPolicyDefault.java:640)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseLocalRack(BlockPlacementPolicyDefault.java:608)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTargetInOrder(BlockPlacementPolicyDefault.java:483)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:390)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:419)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:266)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:119)
>         at org.apache.hadoop.hdfs.server.blockmanagement.ReplicationWork.chooseTargets(ReplicationWork.java:55)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1532)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1491)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3768)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3720)
>         at java.lang.Thread.run(Thread.java:834)
> {code}


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