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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1765) Block Replication should respect under-replication block priority
Date Tue, 13 Dec 2011 03:43:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168112#comment-13168112
] 

Hadoop QA commented on HDFS-1765:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12507109/HDFS-1765.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/1699//console

This message is automatically generated.
                
> Block Replication should respect under-replication block priority
> -----------------------------------------------------------------
>
>                 Key: HDFS-1765
>                 URL: https://issues.apache.org/jira/browse/HDFS-1765
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Hairong Kuang
>            Assignee: Uma Maheswara Rao G
>             Fix For: 0.24.0
>
>         Attachments: HDFS-1765.patch, HDFS-1765.patch, HDFS-1765.patch, HDFS-1765.patch,
HDFS-1765.pdf, underReplicatedQueue.pdf
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Currently under-replicated blocks are assigned different priorities depending on how
many replicas a block has. However the replication monitor works on blocks in a round-robin
fashion. So the newly added high priority blocks won't get replicated until all low-priority
blocks are done. One example is that on decommissioning datanode WebUI we often observe that
"blocks with only decommissioning replicas" do not get scheduled to replicate before other
blocks, so risking data availability if the node is shutdown for repair before decommission
completes.

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