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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9917) IBR accumulate more objects when SNN was down for sometime.
Date Tue, 15 Mar 2016 01:23:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194518#comment-15194518
] 

Brahma Reddy Battula commented on HDFS-9917:
--------------------------------------------

Before Full BR, all pending IBRs will be flushed.
In current problem case, size of IBR itself is huge than FBR,IBR itself failed. because NN
was not able to process it completely. thats why it kept accumulating.


> IBR accumulate more objects when SNN was down for sometime.
> -----------------------------------------------------------
>
>                 Key: HDFS-9917
>                 URL: https://issues.apache.org/jira/browse/HDFS-9917
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>
> SNN was down for sometime because of some reasons..After restarting SNN,it became unreponsive
because 
> - 29 DN's sending IBR in each 5 million ( most of them are delete IBRs), where as each
datanode had only ~2.5 million blocks.
> - GC can't trigger on this objects since all will be under RPC queue. 
> To recover this( to clear this objects) ,restarted all the DN's one by one..This issue
happened in 2.4.1 where split of blockreport was not available.



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