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Posted to hdfs-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/02/05 09:52:34 UTC

[jira] [Commented] (HDFS-7662) Erasure Coder API for encoding and decoding of block group

    [ https://issues.apache.org/jira/browse/HDFS-7662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306867#comment-14306867 ] 

Kai Zheng commented on HDFS-7662:
---------------------------------

Change summary:
1. Refactored the API, getting rid of the questionable callback for easy understanding and using.
2. Provided workable examples per [~zhz]'s request and also for good understanding of the API.
3. It only considers the most simple but often case that only *one step* is involved to encode/decode a block group. The API is subject to change to support complex cases of multiple coding steps. Will have a follow up JIRA for this.

> Erasure Coder API for encoding and decoding of block group
> ----------------------------------------------------------
>
>                 Key: HDFS-7662
>                 URL: https://issues.apache.org/jira/browse/HDFS-7662
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: HDFS-7662-v1.patch, HDFS-7662-v2.patch
>
>
> This is to define ErasureCoder API for encoding and decoding of BlockGroup. Given a BlockGroup, ErasureCoder extracts data chunks from the blocks and leverages RawErasureCoder defined in HDFS-7353 to perform concrete encoding or decoding.



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