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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7337) Configurable and pluggable Erasure Codec and schema
Date Tue, 08 Dec 2015 09:16:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046625#comment-15046625
] 

Kai Zheng commented on HDFS-7337:
---------------------------------

Hi Qijun,

Thanks for your questions. I thought it's good enough to open a jira for your work on the
new RS coder, based on trunk. Regarding the extra schema 8+4, it's easy to add it when we
implement the multiple schema support. The ISA-L coder is under the way and isn't finished
yet. 

A question is, why the new proposed RS coder would be coupled with the specific 8+4 schema?
Sure we can discuss this separately on your new jira.

> Configurable and pluggable Erasure Codec and schema
> ---------------------------------------------------
>
>                 Key: HDFS-7337
>                 URL: https://issues.apache.org/jira/browse/HDFS-7337
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Kai Zheng
>         Attachments: HDFS-7337-prototype-v1.patch, HDFS-7337-prototype-v2.zip, HDFS-7337-prototype-v3.zip,
PluggableErasureCodec-v2.pdf, PluggableErasureCodec-v3.pdf, PluggableErasureCodec.pdf
>
>
> According to HDFS-7285 and the design, this considers to support multiple Erasure Codecs
via pluggable approach. It allows to define and configure multiple codec schemas with different
coding algorithms and parameters. The resultant codec schemas can be utilized and specified
via command tool for different file folders. While design and implement such pluggable framework,
it’s also to implement a concrete codec by default (Reed Solomon) to prove the framework
is useful and workable. Separate JIRA could be opened for the RS codec implementation.
> Note HDFS-7353 will focus on the very low level codec API and implementation to make
concrete vendor libraries transparent to the upper layer. This JIRA focuses on high level
stuffs that interact with configuration, schema and etc.



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