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https://issues.apache.org/jira/browse/HADOOP-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664761#action_12664761
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dhruba borthakur commented on HADOOP-4692:
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My understanding is that the NN will send the block length ( as recorded in NN
metadata) to the source datanode of the replication request. The source
datanode will verify that this length matches the length of the block file on
disk. If it does not match, then the source datanode will not replicate the
block. Is my understanding correct?
> Namenode in infinite loop for replicating/deleting corrupted block
> -------------------------------------------------------------------
>
> Key: HADOOP-4692
> URL: https://issues.apache.org/jira/browse/HADOOP-4692
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.20.0
>
> Attachments: namenode_inconsistent_size.patch,
> truncateBlockReplication.patch
>
>
> Our cluster has an under-replicated block with only one replica, assuming its
> block id is B. NameNode log shows that NameNode is in an infinite loop
> replicating/deleting the block.
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* ask DN1 to replicate blk_B to
> datanode(s) DN2, DN3
> WARN org.apache.hadoop.fs.FSNamesystem: Inconsistent size for block blk_B
> reported from DN2 current size is 134217728 reported size is 134205440
> WARN org.apache.hadoop.fs.FSNamesystem: Deleting block blk_B from DN2
> INFO org.apache.hadoop.dfs.StateChange: DIR* NameSystem.invalidateBlock:
> blk_B on DN2
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.delete: blk_B is
> added to invalidSet of DN2
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.addStoredBlock:
> blockMap updated: DN2 is added to blk_B size 134217728
> WARN org.apache.hadoop.fs.FSNamesystem: Inconsistent size for block blk_-B
> reported from DN3 current size is 134217728 reported size is 134205440
> WARN org.apache.hadoop.fs.FSNamesystem: Deleting block blk_B from DN3
> INFO org.apache.hadoop.dfs.StateChange: DIR* NameSystem.invalidateBlock:
> blk_B on DN3
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.delete: blk_B is
> added to invalidSet of DN3
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.addStoredBlock:
> blockMap updated: DN3 is added to blk_B size 134217728
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* ask DN1 to replicate blk_B to
> datanode(s) DN4, DN5
> ...
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