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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10996) Ability to specify per-file EC policy at create time
Date Thu, 17 Nov 2016 05:56:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15672855#comment-15672855
] 

SammiChen commented on HDFS-10996:
----------------------------------

Hi Andrew, thanks for reviewing the patch!  Yes. it seems the new create API has a lot of
parameters.  A builder-based API will be helpful to user.  I will create a separate JIRA for
it later. 
Talking about refactor, I have several questions. I would like to consult you. 
1. The refactor is about create API. There are create APIs in both {{FileSystem}} abstract
class and {{ClientProtocol}} interface. I think its create API in {{FileSystem}} need to be
refactored. end user is not supposed to call functions of {{ClientProtocol}} directory. 
2. To keep backward compatibility, we should add new builder based create APIs, and not change
current create APIs. And the scope of these new builder based create APIs, put them only in
{{DistributedFileSystme}} class or in {{FileSystem}} class.
Tell me if you have different opinions. 

> Ability to specify per-file EC policy at create time
> ----------------------------------------------------
>
>                 Key: HDFS-10996
>                 URL: https://issues.apache.org/jira/browse/HDFS-10996
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: SammiChen
>         Attachments: HDFS-10996-v1.patch, HDFS-10996-v2.patch, HDFS-10996-v3.patch
>
>
> Based on discussion in HDFS-10971, it would be useful to specify the EC policy when the
file is created. This is useful for situations where app requirements do not map nicely to
the current directory-level policies.



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