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https://issues.apache.org/jira/browse/HDFS-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13887091#comment-13887091
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Kihwal Lee commented on HDFS-4183:
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I think the overhead of block recoveries caused by massive lease expiration
will drastically reduce after HDFS-5790.
> Throttle block recovery
> -----------------------
>
> Key: HDFS-4183
> URL: https://issues.apache.org/jira/browse/HDFS-4183
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 0.23.4, 2.0.2-alpha
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Critical
>
> When a large number of files are abandoned without closing, a storm of lease
> expiration follows in about an hour (lease hard limit). For the last block of
> each file, block recovery is initiated and when the datanode is done, it
> calls commitBlockSynchronization() is called against namenode. A burst of
> these calls can slow down namenode considerably. We need to throttle block
> recovery and/or speed up the rate at which commitBlockSynchronization() is
> served.
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