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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2709) HA: Appropriately handle error conditions in EditLogTailer
Date Fri, 06 Jan 2012 20:44:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2709?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2709.
-------------------------------

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

All the HA tests passed. Committed to branch, thanks atm.
                
> HA: Appropriately handle error conditions in EditLogTailer
> ----------------------------------------------------------
>
>                 Key: HDFS-2709
>                 URL: https://issues.apache.org/jira/browse/HDFS-2709
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>            Priority: Critical
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: HDFS-2709-HDFS-1623.patch, HDFS-2709-HDFS-1623.patch, HDFS-2709-HDFS-1623.patch,
HDFS-2709-HDFS-1623.patch, HDFS-2709-HDFS-1623.patch, HDFS-2709-HDFS-1623.patch, HDFS-2709-HDFS-1623.patch,
HDFS-2709-HDFS-1623.patch, HDFS-2709-HDFS-1623.patch
>
>
> Currently if the edit log tailer experiences an error replaying edits in the middle of
a file, it will go back to retrying from the beginning of the file on the next tailing iteration.
This is incorrect since many of the edits will have already been replayed, and not all edits
are idempotent.
> Instead, we either need to (a) support reading from the middle of a finalized file (ie
skip those edits already applied), or (b) abort the standby if it hits an error while tailing.
If "a" isn't simple, let's do "b" for now and come back to 'a' later since this is a rare
circumstance and better to abort than be incorrect.

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