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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-1555) HDFS 20 append: Disallow pipeline recovery if a file is already being lease recovered
Date Fri, 07 Jan 2011 20:29:52 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang resolved HDFS-1555.
---------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

I just committed this!

> 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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