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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7993) Provide each Replica details in fsck
Date Wed, 30 Sep 2015 16:39:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937601#comment-14937601
] 

Hudson commented on HDFS-7993:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #1203 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1203/])
Addendum fix for HDFS-7749 to be compatible with HDFS-7993 (zhezhang: rev 9af1f4779b646fb2f09b5e36447c8b8abe920a7c)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NamenodeFsck.java


> Provide each Replica details in fsck
> ------------------------------------
>
>                 Key: HDFS-7993
>                 URL: https://issues.apache.org/jira/browse/HDFS-7993
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Ming Ma
>            Assignee: J.Andreina
>             Fix For: 2.8.0
>
>         Attachments: HDFS-7993.1.patch, HDFS-7993.2.patch, HDFS-7993.3.patch, HDFS-7993.4.patch,
HDFS-7993.5.patch, HDFS-7993.6.patch
>
>
> When you run fsck with "-files" or "-racks", you will get something like below if one
of the replicas is decommissioned.
> {noformat}
> blk_x len=y repl=3 [dn1, dn2, dn3, dn4]
> {noformat}
> That is because in NamenodeFsck, the repl count comes from live replicas count; while
the actual nodes come from LocatedBlock which include decommissioned nodes.
> Another issue in NamenodeFsck is BlockPlacementPolicy's verifyBlockPlacement verifies
LocatedBlock that includes decommissioned nodes. However, it seems better to exclude the decommissioned
nodes in the verification; just like how fsck excludes decommissioned nodes when it check
for under replicated blocks.



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