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https://issues.apache.org/jira/browse/HDFS-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065458#comment-14065458
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Allen Wittenauer commented on HDFS-122:
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I suspect this a bit stale and can probably be closed. Anyone?
> Namenode should let Datanode decide how to delete blocks.
> ---------------------------------------------------------
>
> Key: HDFS-122
> URL: https://issues.apache.org/jira/browse/HDFS-122
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Raghu Angadi
>
> See HADOOP-2576 and HADOOP-774 for more discussion.
> Namenode throttles the number of blocks it asks Datanode to delete. It does
> this because it "knows" that Datanode deletes these blocks in the same thread
> that heartbeats and does not want that thread to block for long. Managing
> this is more memory and more code at Namenode.
> I think namenode should just ask Datanode to delete the blocks and Datanode
> can decide how it deletes them. It would be datanode's responsibility to
> properly delete the blocks however it sees fit. For e.g. it could delete them
> in separate thread and not let heartbeats affected by this.
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