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From "J.Andreina (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 Wed, 21 Mar 2012 10:03:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234245#comment-13234245
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J.Andreina commented on HDFS-3119:
----------------------------------


I understood whatever u have commented and i agree with your comments

But if the replication cannot be done for an unfinalized block 
then the log message : "Decreasing replication from 2 to 1 for /filewrite.txt" at the NN side
when we decrease the replication for an unfinalized block can be avoided.
                
> 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
>            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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