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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4288) NN accepts incremental BR as IBR in safemode
Date Wed, 09 Jan 2013 20:10:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548938#comment-13548938
] 

Suresh Srinivas commented on HDFS-4288:
---------------------------------------

bq. Better yet, the logic would be to (seqNum == 0 || seqNum != lastSeqNum). However this
requires writable/RPC changes on 23, and protobuf changes on trunk/2 and trying to ensure
backwards compatibility with an optional protobuf field, etc. Would you be ok if I filed another
jira?
Separate jira should be fine. We may want to mark this jira as 0.23 only. 
                
> 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
>         Attachments: HDFS-4288.branch-23.patch
>
>
> 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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