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https://issues.apache.org/jira/browse/HDFS-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969564#action_12969564
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Jonathan Gray commented on HDFS-1520:
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@Hairong, we have not worked on HBase atop 0.22 so don't worry about it now.
Let's have a more in depth conversation about this when we actually support
0.22 (unless it's now or never onto trunk? in that case if it's not much
trouble I'd say we want it on trunk).
> 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
> 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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