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https://issues.apache.org/jira/browse/HDFS-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978937#action_12978937
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Nicolas Spiegelberg commented on HDFS-1555:
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+1. This is very useful for our HBase use case! Thanks Hairong
> HDFS 20 append: Disallow pipeline recovery if a file is already being lease
> recovered
> -------------------------------------------------------------------------------------
>
> Key: HDFS-1555
> URL: https://issues.apache.org/jira/browse/HDFS-1555
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 0.20-append
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.20-append
>
> Attachments: appendRecoveryRace.patch, recoveryRace.patch
>
>
> When a file is under lease recovery and the writer is still alive, the write
> pipeline will be killed and then the writer will start a pipeline recovery.
> Sometimes the pipeline recovery may race before the lease recovery and as a
> result fail the lease recovery. This is very bad if we want to support the
> strong recoverLease semantics in HDFS-1554. So it would be nice if we could
> disallow a file's pipeline recovery while its lease recovery is in progress.
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