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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13314) NameNode should optionally exit if it detects FsImage corruption
Date Tue, 20 Mar 2018 23:03:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16407196#comment-16407196
] 

Arpit Agarwal commented on HDFS-13314:
--------------------------------------

bq. How is the "safe" choice to knowingly write a corrupt image? One that renders the NN incapable
of starting up?
Once we get to this point, the metadata is already corrupt. Writing out a new FsImage doesn't
make it any worse because replaying the prior image and edits would lead to the same state.


bq. We need to immediately do a full stop anytime data structures are known to be corrupt.
That is my intention. Looks like you've gone over the patch. Is there anything you suggest
doing differently?

> NameNode should optionally exit if it detects FsImage corruption
> ----------------------------------------------------------------
>
>                 Key: HDFS-13314
>                 URL: https://issues.apache.org/jira/browse/HDFS-13314
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>            Priority: Major
>         Attachments: HDFS-13314.01.patch, HDFS-13314.02.patch, HDFS-13314.03.patch
>
>
> The NameNode should optionally exit after writing an FsImage if it detects the following
kinds of corruptions:
> # INodeReference pointing to non-existent INode
> # Duplicate entries in snapshot deleted diff list.
> This behavior is controlled via an undocumented configuration setting, and disabled by
default.



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