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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8430) Erasure coding: compute file checksum for stripe files
Date Wed, 13 Jan 2016 10:35:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15095978#comment-15095978

Kai Zheng commented on HDFS-8430:

Well, I may wait some other days for some comments. Anyhow, would proceed in next week and
provide a formal patch as I summarized above. In the initial version, very probably: 
* for the new API {{getFileChecksum}}, it may try distributing the computing task to DataNode
to avoid network congestion in the client as Nicholas said; 
* will use the current MD5MD5CRC32 approach, not use CRC64 and leave it for subsequent revision
or follow-on task according to review comments.

> Erasure coding: compute file checksum for stripe files
> ------------------------------------------------------
>                 Key: HDFS-8430
>                 URL: https://issues.apache.org/jira/browse/HDFS-8430
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Walter Su
>            Assignee: Kai Zheng
>         Attachments: HDFS-8430-poc1.patch
> HADOOP-3981 introduces a  distributed file checksum algorithm. It's designed for replicated
> {{DFSClient.getFileChecksum()}} need some updates, so it can work for striped block group.

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