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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 Wed, 09 Mar 2016 02:43:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186372#comment-15186372
] 

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

 *Following tested on trunk,not the original cluster data.* 

{noformat}
After stopping the SNN:
=======================

BLR1000006554:/opt/Trunk/hadoop/bin # jmap -histo:live 34458 | tee dnheap.log | grep -i org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo
 19:          2801          67224  org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo
 852:             3             72  org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo$BlockStatus
1234:             1             32  [Lorg.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo$BlockStatus;

After 10 mins where I am just writing the files:
================================================

BLR1000006554:/opt/Trunk/hadoop/bin # jmap -histo:live 34458 | tee dnheap.log | grep -i org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo
   5:         73957        1774968  org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo
 852:             3             72  org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo$BlockStatus
1234:             1             32  [Lorg.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo$BlockStatus;

After Restart of SNN:
====================
BLR1000006554:/opt/Trunk/hadoop/bin # jmap -histo:live 34458 | tee dnheap.log | grep -i org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo
 848:             3             72  org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo$BlockStatus
1237:             1             32  [Lorg.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo$BlockStatus;
{noformat}




> 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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