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From "Kai Sasaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8494) Remove hard-coded chunk size in favor of ECZone
Date Thu, 04 Jun 2015 01:40:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14571956#comment-14571956
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Kai Sasaki commented on HDFS-8494:
----------------------------------

Thank you so much for clarifying critical points.

{quote}
FSImageHandler for Web HDFS, ...
... For the first, we can get the zone info anyway since it's not really called during startup
{quote}

I cannot fully understand this point. {{FSImageHandler}} is used by Web HDFS, {{WebImageViewer}}.
{{WebImageViewer}} looks keep only fsimage data. This data is restored through {{FSImageLoader}}.
So anyway is it necessary to restore ECZone info from fsimage file? Is there other way we
should restore ECZone info from NN or something? 



> Remove hard-coded chunk size in favor of ECZone
> -----------------------------------------------
>
>                 Key: HDFS-8494
>                 URL: https://issues.apache.org/jira/browse/HDFS-8494
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Kai Sasaki
>            Assignee: Kai Sasaki
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-8494-HDFS-7285-01.patch
>
>
> It is necessary to remove hard-coded values inside NameNode configured in {{HdfsConstants}}.
In this JIRA, we can remove {{chunkSize}} gracefully in favor of HDFS-8375.
> Because {{cellSize}} is now originally stored only in {{ErasureCodingZone}}, {{BlockInfoStriped}}
can receive {{cellSize}} in addition to {{ECSchema}} when its initialization.



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