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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2693) Synchronization issues around state transition
Date Wed, 21 Dec 2011 03:05:33 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2693.
-------------------------------

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

Committed to branch, thx for the reviews Eli.
                
> Synchronization issues around state transition
> ----------------------------------------------
>
>                 Key: HDFS-2693
>                 URL: https://issues.apache.org/jira/browse/HDFS-2693
>             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-2693.txt, hdfs-2693.txt, hdfs-2693.txt, hdfs-2693.txt, hdfs-2693.txt
>
>
> Currently when the NN changes state, it does so without synchronization. In particular,
the state transition function does:
> (1) leave old state
> (2) change state variable
> (3) enter new state
> This means that the NN is marked as "active" before it has actually transitioned to active
mode and opened its edit logs. This gives a window where write transactions can come in and
the {{checkOperation}} allows them, but then they fail because the edit log is not yet opened.

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