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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2359) NPE found in Namenode log while Disk failed during distcp
Date Fri, 23 Sep 2011 00:31:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113057#comment-13113057
] 

Aaron T. Myers commented on HDFS-2359:
--------------------------------------

Looks like the description of this JIRA should say "NameNode", not "DataNode", right?

> NPE found in Namenode log while Disk failed during distcp 
> ----------------------------------------------------------
>
>                 Key: HDFS-2359
>                 URL: https://issues.apache.org/jira/browse/HDFS-2359
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>            Reporter: Rajit
>
> 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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