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Date: Mon, 26 Sep 2011 22:05:12 +0000 (UTC)
From: "Jonathan Eagles (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2359) NPE found in Datanode log while Disk
 failed during different HDFS operation
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    [ https://issues.apache.org/jira/browse/HDFS-2359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114966#comment-13114966 ] 

Jonathan Eagles commented on HDFS-2359:
---------------------------------------

Thanks, Suresh!
                
> NPE found in Datanode log while Disk failed during different HDFS operation
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-2359
>                 URL: https://issues.apache.org/jira/browse/HDFS-2359
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.20.205.0
>            Reporter: Rajit
>            Assignee: Jonathan Eagles
>         Attachments: HDFS-2359-branch-0.20-security.patch
>
>
> Scenario:
> I have a cluster of 4 DN ,each of them have 12disks.
> In hdfs-site.xml I have "dfs.datanode.failed.volumes.tolerated=3" 
> During the execution of distcp (hdfs->hdfs), I am failing 3 disks in one Datanode, by making Data Directory permission 000, The distcp job is successful but , I am getting some NullPointerException in Datanode log
> In one thread
> $hadoop distcp  /user/$HADOOPQA_USER/data1 /user/$HADOOPQA_USER/data3
> In another thread in a datanode
> $ chmod 000 /xyz/{0,1,2}/hadoop/var/hdfs/data
> where [ dfs.data.dir is set as /xyz/{0..11}/hadoop/var/hdfs/data ]
> Log Snippet from the Datanode
> =============
> 2011-09-19 12:43:40,314 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unexpected error trying to delete block
> blk_7065198814142552283_62557. BlockInfo not found in volumeMap.
> 2011-09-19 12:43:40,314 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unexpected error trying to delete block
> blk_7066946313092770579_39189. BlockInfo not found in volumeMap.
> 2011-09-19 12:43:40,314 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unexpected error trying to delete block
> blk_7070305189404753930_49359. BlockInfo not found in volumeMap.
> 2011-09-19 12:43:40,327 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Error processing datanode Command
> java.io.IOException: Error in deleting blocks.
>         at org.apache.hadoop.hdfs.server.datanode.FSDataset.invalidate(FSDataset.java:1820)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.processCommand(DataNode.java:1074)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.processCommand(DataNode.java:1036)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.offerService(DataNode.java:891)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.run(DataNode.java:1419)
>         at java.lang.Thread.run(Thread.java:619)
> 2011-09-19 12:43:41,304 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode:
> DatanodeRegistration(xx.xxx.xxx.xxx:xxxx, storageID=xx-xxxxxxxxxxxx-xx.xxx.xxx.xxx-xxxx-xxxxxxxxxxx, infoPort=1006,
> ipcPort=8020):DataXceiver
> java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.server.datanode.DataBlockScanner$LogFileHandler.appendLine(DataBlockScanner.java:788)
>         at org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.updateScanStatusInternal(DataBlockScanner.java:365)
>         at org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.verifiedByClient(DataBlockScanner.java:308)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:205)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:99)
>         at java.lang.Thread.run(Thread.java:619)
> 2011-09-19 12:43:43,313 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unexpected error trying to delete block
> blk_7071818644980664768_40827. BlockInfo not found in volumeMap.
> 2011-09-19 12:43:43,313 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unexpected error trying to delete block
> blk_7073840977856837621_62108. BlockInfo not found in volumeMap.

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