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Posted to hdfs-issues@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2015/07/15 16:18:05 UTC

[jira] [Assigned] (HDFS-8619) Erasure Coding: revisit replica counting for striped blocks

     [ https://issues.apache.org/jira/browse/HDFS-8619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yi Liu reassigned HDFS-8619:
----------------------------

    Assignee: Yi Liu  (was: Jing Zhao)

> 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: Yi Liu
>         Attachments: HDFS-8619-HDFS-7285.001.patch, 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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