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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11268) Persist erasure coding policy ID in FSImage
Date Thu, 22 Dec 2016 18:37:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15770761#comment-15770761
] 

Arpit Agarwal commented on HDFS-11268:
--------------------------------------

bq. In case if the ec policy on file is not the default ec policy, then the content of the
file cannot be accessed correctly in this case. 
If this is true it sounds like a bug and not an improvement.

> Persist erasure coding policy ID in FSImage
> -------------------------------------------
>
>                 Key: HDFS-11268
>                 URL: https://issues.apache.org/jira/browse/HDFS-11268
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0-alpha1
>            Reporter: SammiChen
>            Assignee: SammiChen
>              Labels: hdfs-ec-3.0-must-do
>
> Currently, FSImage only has the information about whether the file is striped or not.
It doesn't save the erasure coding policy ID. Later, when the FSImage is loaded to create
the name space, the default system ec policy is used to as file's ec policy.  In case if the
ec policy on file is not the default ec policy, then the content of the file cannot be accessed
correctly in this case. 



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