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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8901) Use ByteBuffer in striping positional read
Date Mon, 07 Dec 2015 09:08:10 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kai Zheng updated HDFS-8901:
----------------------------
    Attachment: HDFS-8901-v4.patch

Thanks [~zhz] for the check. 
Updated the patch:
1. Fixed the test failure by bringing back necessary codes from HDFS-8905;
2. Cleaned up some old check style issues;
3. Refined a bit the *TestDFSStripedInputStream* test.

> Use ByteBuffer in striping positional read
> ------------------------------------------
>
>                 Key: HDFS-8901
>                 URL: https://issues.apache.org/jira/browse/HDFS-8901
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: HDFS-8901-v2.patch, HDFS-8901-v3.patch, HDFS-8901-v4.patch, initial-poc.patch
>
>
> Native erasure coder prefers to direct ByteBuffer for performance consideration. To prepare
for it, this change uses ByteBuffer through the codes in implementing striping position read.
It will also fix avoiding unnecessary data copying between striping read chunk buffers and
decode input buffers.



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