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From "Tsz Wo (Nicholas), SZE (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3119) Overreplicated block is not deleted even after the replication factor is reduced after sync follwed by closing that file
Date Thu, 29 Mar 2012 01:55:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240909#comment-13240909
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Tsz Wo (Nicholas), SZE commented on HDFS-3119:
----------------------------------------------

> I don't see any OverReplicated processing from neededReplication priority Queues. We
will just remove from needed replication queues. Am I missing?

computeReplicationWork(..) only takes care about replication but not deletion.  Deletion is
done by computeInvalidateWork(..).

addStoredBlock(..) does call processOverReplicatedBlock(..) but the values of numCurrentReplica
or fileReplication may be incorrect.  We should print them out for debugging.
                
> Overreplicated block is not deleted even after the replication factor is reduced after
sync follwed by closing that file
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3119
>                 URL: https://issues.apache.org/jira/browse/HDFS-3119
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.24.0
>            Reporter: J.Andreina
>            Assignee: Brandon Li
>            Priority: Minor
>             Fix For: 0.24.0, 0.23.2
>
>
> cluster setup:
> --------------
> 1NN,2 DN,replication factor 2,block report interval 3sec ,block size-256MB
> step1: write a file "filewrite.txt" of size 90bytes with sync(not closed) 
> step2: change the replication factor to 1  using the command: "./hdfs dfs -setrep 1 /filewrite.txt"
> step3: close the file
> * At the NN side the file "Decreasing replication from 2 to 1 for /filewrite.txt" , logs
has occured but the overreplicated blocks are not deleted even after the block report is sent
from DN
> * while listing the file in the console using "./hdfs dfs -ls " the replication factor
for that file is mentioned as 1
> * In fsck report for that files displays that the file is replicated to 2 datanodes

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