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https://issues.apache.org/jira/browse/HDFS-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234225#comment-13234225
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Uma Maheswara Rao G commented on HDFS-3119:
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The block is not finalized yet, changing replication for this block may not be
correct.
Increasing/Decreasing the replication for the unfinalized block would not work
as per my understanding.
Simple case is, updating the pipeline for further write after the sync will be
difficult if you change the replication for unfinalized blocks.
do you agree?
> 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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