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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9959) add log when block removed from last live datanode
Date Fri, 18 Mar 2016 20:40:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15202111#comment-15202111
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Arpit Agarwal commented on HDFS-9959:
-------------------------------------

Hi [~zhaoyunjiong], this will need some thought to get right. We don't want to keep more state
in the NN than necessary. Also access to missingBlocks needs to be synchronized in some way.
I am not sure this is worth the effort and risk, tbh.

> add log when block removed from last live datanode
> --------------------------------------------------
>
>                 Key: HDFS-9959
>                 URL: https://issues.apache.org/jira/browse/HDFS-9959
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: yunjiong zhao
>            Assignee: yunjiong zhao
>            Priority: Minor
>         Attachments: HDFS-9959.1.patch, HDFS-9959.patch
>
>
> Add logs like "BLOCK* No live nodes contain block blk_1073741825_1001, last datanode
contain it is node: 127.0.0.1:65341" in BlockStateChange should help to identify which datanode
should be fixed first to recover missing blocks.



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