[jira] [Updated] (HDFS-7993) Incorrect descriptions in fsck when nodes are decommissioned

["J.Andreina (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-7993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

J.Andreina updated HDFS-7993:
-----------------------------
    Attachment: HDFS-7993.1.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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