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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2079) [hbase] HLog generates incorrect file name when splitting a log, race condition also contributes
Date Sat, 20 Oct 2007 03:20:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Kellerman updated HADOOP-2079:
----------------------------------

    Status: Patch Available  (was: Open)

> [hbase] HLog generates incorrect file name when splitting a log, race  condition also
contributes
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2079
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2079
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: Jim Kellerman
>            Assignee: Jim Kellerman
>             Fix For: 0.16.0
>
>         Attachments: patch.txt
>
>
> In Hadoop-Nightly #277 TestRegionServerExit failed with a timeout.
> The reason for this was a race in the Master in which checkAssigned (run from either
the root or meta scanner)  will immediately try to split the log and then assign a region
which has invalid server info.
> The scenario went something like this:
> 1. region server aborted
> 2. root region was written on optional cache flush
> lease timed out on aborted server which removes it from serversToServerInfo and queues
a PendingServerShutdown operation
> 3. root scanner runs and finds server info incorrect (it is in the root region but the
server is not in serversToServerInfo
> 4. checkAssigned starts splitting the log but because the log name is incorrect it can't
finish
> 5. PendingServerShutdown fires and really gums up the works.
> So there are two problems:
> 1. HLog.splitLog needs to generate the correct log file name.
> 2. PendingServerShutdown and/or leaseExpired need to cooperate with checkAssigned so
that there are not two concurrent attempts to recover the log.

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