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https://issues.apache.org/jira/browse/HDFS-7993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486704#comment-14486704
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J.Andreina commented on HDFS-7993:
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Thanks [~cmccabe] and [~mingma] for suggestions.
bq. I wonder if we could have a "-replicaDetails" option that could print out
more detail about each replica
I agree with this point. Have uploaded an initial patch for adding
"-replicaDetails" option to fsck command.
After applying patch the result would be like below
> hdfs fsck /100 -files -blocks -replicaDetails
/100 6619 bytes, 1 block(s): Under replicated
BP-1926123874-10.19.92.116-1428408820198:blk_1073741829_1005. Target Replicas
is 3 but found 1 replica(s).
0. BP-1926123874-10.19.92.116-1428408820198:blk_1073741829_1005 len=6619 repl=1
[DatanodeInfoWithStorage[10.19.92.116:50010,DS-13faa414-cf01-4ae7-b307-2ae87caa273c,DISK]*(LIVE
Replica)*,
DatanodeInfoWithStorage[10.19.92.114:50010,DS-583ffc24-075f-4ad1-913b-45fe0f8a9c82,DISK]*(DECOMMISSIONING
Replica)*]
Please review the patch .
> Incorrect descriptions in fsck when nodes are decommissioned
> ------------------------------------------------------------
>
> 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
> Attachments: HDFS-7993.1.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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