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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2634) Standby needs to ingest latest edit logs before transitioning to active`
Date Thu, 08 Dec 2011 23:57:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2634.
-------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

committed latest patch, thx for the reviews.
                
> Standby needs to ingest latest edit logs before transitioning to active`
> ------------------------------------------------------------------------
>
>                 Key: HDFS-2634
>                 URL: https://issues.apache.org/jira/browse/HDFS-2634
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: hdfs-2634.txt, hdfs-2634.txt
>
>
> When the standby transitions to active state, it needs to _read_ the latest edit logs
before it reopens them for write access. Currently, the transition calls {{stopStandbyServices}},
which stops the tailer, but doesn't read ahead to the very end. This ends up leaving the shared
edits dir in an inconsistent state where we have overlapping transaction IDs.

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