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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4288) NN accepts incremental BR as IBR in safemode
Date Thu, 13 Dec 2012 23:02:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13531613#comment-13531613
] 

Aaron T. Myers commented on HDFS-4288:
--------------------------------------

bq. Non-23 branches appear to have a rudimentary fix for this issue.

Can you point out what exactly it is in branch-2 and trunk which appears to have fixed this?
                
> NN accepts incremental BR as IBR in safemode
> --------------------------------------------
>
>                 Key: HDFS-4288
>                 URL: https://issues.apache.org/jira/browse/HDFS-4288
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>
> If a DN is ready to send an incremental BR and the NN goes down, the DN will repeatedly
try to reconnect.  The NN will then process the DN's incremental BR as an initial BR.  The
NN now thinks the DN has only a few blocks, and will ignore all subsequent BRs from that DN
until out of safemode -- which it may never do because of all the "missing" blocks on the
affected DNs.

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