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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5483) NN should gracefully handle multiple block replicas on same DN
Date Thu, 20 Feb 2014 00:20:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-5483:
--------------------------------

    Hadoop Flags: Reviewed

+1 for the patch.  Thank you, Arpit.

> NN should gracefully handle multiple block replicas on same DN
> --------------------------------------------------------------
>
>                 Key: HDFS-5483
>                 URL: https://issues.apache.org/jira/browse/HDFS-5483
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: Heterogeneous Storage (HDFS-2832)
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: 3.0.0
>
>         Attachments: h5483.02.patch, h5483.03.patch, h5483.04.patch
>
>
> {{BlockManager#reportDiff}} can cause an assertion failure in {{BlockInfo#moveBlockToHead}}
if the block report shows the same block as belonging to more than one storage.
> The issue is that {{moveBlockToHead}} assumes it will find the DatanodeStorageInfo for
the given block.
> Exception details:
> {code}
> java.lang.AssertionError: Index is out of bound
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo.setNext(BlockInfo.java:152)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo.moveBlockToHead(BlockInfo.java:351)
>         at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo.moveBlockToHead(DatanodeStorageInfo.java:243)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.reportDiff(BlockManager.java:1841)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processReport(BlockManager.java:1709)
>         at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processReport(BlockManager.java:1637)
>         at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.blockReport(NameNodeRpcServer.java:984)
>         at org.apache.hadoop.hdfs.server.datanode.TestDataNodeVolumeFailure.testVolumeFailure(TestDataNodeVolumeFailure.java:165)
> {code}



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