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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8619) Erasure Coding: revisit replica counting for striped blocks
Date Tue, 23 Jun 2015 20:29:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14598322#comment-14598322
] 

Zhe Zhang commented on HDFS-8619:
---------------------------------

Thanks Jing for splitting the patch for HDFS-8652!

bq. Please let me know if you need any help on either development or code review.
Thanks for offering the help! It would be great if you can help review HDFDS-8623 and HDFS-8653.
HDFS-8623 might have some overlap with HDFS-8652 patch. Depending on how they go, I'm happy
to rebase either patch.

> Erasure Coding: revisit replica counting for striped blocks
> -----------------------------------------------------------
>
>                 Key: HDFS-8619
>                 URL: https://issues.apache.org/jira/browse/HDFS-8619
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-8619.000.patch
>
>
> Currently we use the same {{BlockManager#countNodes}} method for striped blocks, which
simply treat each internal block as a replica. However, for a striped block, we may have more
complicated scenario, e.g., we have multiple replicas of the first internal block while we
miss some other internal blocks. Using the current {{countNodes}} methods can lead to wrong
decision in these scenarios.



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