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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2975) DFSClient names in master and RS should be unique
Date Thu, 09 Sep 2010 17:14:32 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-2975:
-------------------------------

           Status: Resolved  (was: Patch Available)
     Hadoop Flags: [Reviewed]
    Fix Version/s: 0.90.0
       Resolution: Fixed

Committed to 0.89.20100830 branch, plus trunk. Thanks for reviewing stack.

> DFSClient names in master and RS should be unique
> -------------------------------------------------
>
>                 Key: HBASE-2975
>                 URL: https://issues.apache.org/jira/browse/HBASE-2975
>             Project: HBase
>          Issue Type: Bug
>          Components: master, regionserver
>    Affects Versions: 0.90.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.90.0
>
>         Attachments: hbase-2975.txt
>
>
> In the post-newmaster trunk, there's some code which gives the regionserver and masters
fancy names based on hostname and port. This breaks log recovery, though, if the master starts
recovering a log (ie has an append lease on a log file), then crashes and comes back on the
same port. The NN doesn't see this as a new client, since the client name is the same, so
it thinks it still holds a lease on the file. The new master, though, can't call append()
because the NN thinks it's appending, so it loops forever.

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