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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8957) Consolidate client striping input stream codes for stateful read and positional read
Date Tue, 26 Jul 2016 08:47:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15393445#comment-15393445
] 

Kai Zheng commented on HDFS-8957:
---------------------------------

I just did it. Thanks for the taking!

> Consolidate client striping input stream codes for stateful read and positional read
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-8957
>                 URL: https://issues.apache.org/jira/browse/HDFS-8957
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>            Reporter: Kai Zheng
>            Assignee: Youwei Wang
>         Attachments: HDFS-8957-v1.patch
>
>
> Currently we have different implementations for client striping read, having both *StatefulStripeReader*
and *PositionStripeReader*. I attempted to consolidate the two implementations into one, and
it results in much simpler codes, and also better performance. Now in both read paths, it
will:
> * Use pooled ByteBuffers, as currently stateful read does;
> * Read directly into application's buffer, as currently positional read does;
> * Try to align and merge multiple stripes, as currently positional read does;
> * Use *ECChunk* version decode API.
> The resultant *StripeReader* is approaching very near now to the ideal state desired
by next step, employing *ErasureCoder* API instead of *RawErasureCoder* API.
> Will upload an initial patch to illustrate the rough change, even though it depends on
other issues.



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