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https://issues.apache.org/jira/browse/HDFS-611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753869#action_12753869
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Eli Collins commented on HDFS-611:
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Why is the heartbeat thread involved with block deletion?
Per the fifth comment in HDFS-599 can someone explain in general why the
failure detection code is not encapsulated from the rest of the daemon? If it
were a separate module it seems that we wouldn't have to worry about RPC
priorities, JVM GC, block deletion, etc interfering with it.
Thanks,
Eli
> 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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