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https://issues.apache.org/jira/browse/HDFS-611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766851#action_12766851
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Zheng Shao commented on HDFS-611:
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+1 on the idea.
Encountered this bug on 0.19 when doing a HDFS stress test - DataNode was not
able to send received block list, so client gets "block not replicated"
exception.
I think we can start with 1 thread per volumn, and in case it cannot keep up,
we can make that "1" configurable.
> Heartbeats times from Datanodes increase when there are plenty of blocks to
> delete
> ----------------------------------------------------------------------------------
>
> Key: HDFS-611
> URL: https://issues.apache.org/jira/browse/HDFS-611
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> I am seeing that when we delete a large directory that has plenty of blocks,
> the heartbeat times from datanodes increase significantly from the normal
> value of 3 seconds to as large as 50 seconds or so. The heartbeat thread in
> the Datanode deletes a bunch of blocks sequentially, this causes the
> heartbeat times to increase.
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