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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2824) HA: failover does not succeed if prior NN died just after creating an edit log segment
Date Mon, 30 Jan 2012 22:31:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196490#comment-13196490
] 

Todd Lipcon commented on HDFS-2824:
-----------------------------------

+1, thanks for the explanation
                
> HA: failover does not succeed if prior NN died just after creating an edit log segment
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-2824
>                 URL: https://issues.apache.org/jira/browse/HDFS-2824
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-2824-HDFS-1623.patch, HDFS-2824-HDFS-1623.patch
>
>
> In stress testing failover, I had the following failure:
> - NN1 rolls edit logs and starts writing edits_inprogress_1000
> - NN1 crashes before writing the START_LOG_SEGMENT transaction
> - NN2 tries to become active, and calls {{recoverUnfinalizedSegment}}. Since the log
file contains no valid transactions, it is marked as corrupt and renamed with the {{.corrupt}}
suffix
> - The sanity check in {{openLogsForWrite}} will refuse to open a new in-progress log
at the same txid. Failover does not proceed.

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