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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-1984) HDFS-1073: Enable multiple checkpointers to run simultaneously
Date Wed, 25 May 2011 01:04:47 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon resolved HDFS-1984.

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Committed to branch. Made a note of the TODO for requiring md5 files on image transfer.

> HDFS-1073: Enable multiple checkpointers to run simultaneously
> --------------------------------------------------------------
>                 Key: HDFS-1984
>                 URL: https://issues.apache.org/jira/browse/HDFS-1984
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: Edit log branch (HDFS-1073)
>         Attachments: hdfs-1984.txt
> One of the motivations of HDFS-1073 is that it decouples the checkpoint process so that
multiple checkpoints could be taken at the same time and not interfere with each other.
> Currently on the 1073 branch this doesn't quite work right, since we have some state
and validation in FSImage that's tied to a single fsimage_N -- thus if two 2NNs perform a
checkpoint at different transaction IDs, only one will succeed.
> As a stress test, we can run two 2NNs each configured with the fs.checkpoint.interval
set to "0" which causes them to continuously checkpoint as fast as they can.

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