[ http://issues.apache.org/jira/browse/HADOOP-774?page=all ]
Doug Cutting updated HADOOP-774:
--------------------------------
Status: Resolved (was: Patch Available)
Fix Version/s: 0.10.0
Resolution: Fixed
I just committed this. Thanks, Dhruba!
> Datanodes fails to heartbeat when a directory with a large number of blocks
> is deleted
> --------------------------------------------------------------------------------------
>
> Key: HADOOP-774
> URL: http://issues.apache.org/jira/browse/HADOOP-774
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assigned To: dhruba borthakur
> Fix For: 0.10.0
>
> Attachments: chunkinvalidateBlocks2.java
>
>
> If a user removes a few files that are huge, it causes the namenode to send
> BlockInvalidate command to the relevant Datanodes. The Datanode process the
> blockInvalidate command as part of its heartbeat thread. If the number of
> blocks to be invalidated is huge, the datanode takes a long time to process
> it. This causes the datanode to not send new heartbeats to the namenode. The
> namenode declares the datanode as dead!
> 1. One option is to process the blockInvalidate as a separate thread from the
> heartbeat thread in the Datanode.
> 2. Another option would be to constrain the namenode to send a max (e.g. 500)
> blocks per blockInvalidate message.
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