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https://issues.apache.org/jira/browse/HDFS-5483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865965#comment-13865965
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Arpit Agarwal commented on HDFS-5483:
-------------------------------------
Eric, the blockreceived path won't assert since it doesn't try to manipulate
the BlockInfo list directly.
However looking at it some more I think we can eliminate the findDatanode
routine, or at least make it 'private'. I'll file a separate Jira for it.
> 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
> Fix For: 3.0.0
>
> Attachments: h5483.02.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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