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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13665) Erasure Coding codec should support fallback coder
Date Thu, 23 Mar 2017 06:57:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937837#comment-15937837
] 

Kai Zheng commented on HADOOP-13665:
------------------------------------

Thanks [~kaisasak]!

I guess we're much aligned. We don't need {{io.erasurecode.codec.rs.rawcoder}} any more if
we have {{io.erasurecode.codec.rs.rawcoders}}. I mean, if the value of {{...rawcoders}} contains
more than one, we use the first one; if just one, it's OK and we just use it. Sounds good?

> Erasure Coding codec should support fallback coder
> --------------------------------------------------
>
>                 Key: HADOOP-13665
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13665
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io
>            Reporter: Wei-Chiu Chuang
>            Assignee: Kai Sasaki
>            Priority: Blocker
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HADOOP-13665.01.patch, HADOOP-13665.02.patch, HADOOP-13665.03.patch,
HADOOP-13665.04.patch, HADOOP-13665.05.patch
>
>
> The current EC codec supports a single coder only (by default pure Java implementation).
If the native coder is specified but is unavailable, it should fallback to pure Java implementation.
> One possible solution is to follow the convention of existing Hadoop native codec, such
as transport encryption (see {{CryptoCodec.java}}). It supports fallback by specifying two
or multiple coders as the value of property, and loads coders in order.



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