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Posted to hdfs-issues@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2015/05/08 08:41:00 UTC

[jira] [Commented] (HDFS-8347) Erasure Coding: whether to use chunkSize as the to decode buffersize for Datanode striped block reconstruction.

    [ https://issues.apache.org/jira/browse/HDFS-8347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533965#comment-14533965 ] 

Zhe Zhang commented on HDFS-8347:
---------------------------------

Thanks Yi for finding out the error. AFAIU the end result of encoding a set of 10-byte chunks should be the same as encoding individual bytes one by one. Not quite sure how Hitchhiker changes the story. 

> Erasure Coding: whether to use chunkSize as the to decode buffersize for Datanode striped block reconstruction.
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-8347
>                 URL: https://issues.apache.org/jira/browse/HDFS-8347
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>
> Currently decode buffersize for Datanode striped block reconstruction is configurable and can be less or larger than chunksize, it may cause issue for Hitchhiker which may require encode/decode using same buffersize.



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