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From "Takanobu Asanuma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8799) Erasure Coding: add tests for namenode processing corrupt striped blocks
Date Mon, 27 Jul 2015 12:50:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14642686#comment-14642686
] 

Takanobu Asanuma commented on HDFS-8799:
----------------------------------------

Thanks for the great work, [~walter.k.su]!
I read and ran your patch. It looks good to me(non-binding). And I was able to get familiar
with recovery work about ec.
And I did some test with your patch. If we want to recover all ec blocks, we need at least
nine datanodes which don't have the corrupt blocks, right?
So if there are 3 corrupt ec blocks in one ec block group, we need at least 12 datanodes to
recover the all ec blocks. This is not unintuitive. How about add this case?

> Erasure Coding: add tests for namenode processing corrupt striped blocks
> ------------------------------------------------------------------------
>
>                 Key: HDFS-8799
>                 URL: https://issues.apache.org/jira/browse/HDFS-8799
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: test
>            Reporter: Walter Su
>            Assignee: Walter Su
>            Priority: Minor
>         Attachments: HDFS-8799-HDFS-7285.01.patch
>
>




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