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https://issues.apache.org/jira/browse/HDFS-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048299#comment-13048299
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Hudson commented on HDFS-1520:
------------------------------
Integrated in Hadoop-Hdfs-22-branch #66 (See
[https://builds.apache.org/job/Hadoop-Hdfs-22-branch/66/])
> HDFS 20 append: Lightweight NameNode operation to trigger lease recovery
> ------------------------------------------------------------------------
>
> Key: HDFS-1520
> URL: https://issues.apache.org/jira/browse/HDFS-1520
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Affects Versions: 0.20-append
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.20-append
>
> Attachments: recoverLeaseApache20.patch
>
>
> Currently HBase uses append to trigger the close of HLog during Hlog split.
> Append is a very expensive operation, which involves not only NameNode
> operations but creating a writing pipeline. If one of datanodes on the
> pipeline has a problem, this recovery may takes minutes. I'd like implement a
> lightweight NameNode operation to trigger lease recovery and make HBase to
> use this instead.
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