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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8901) Use ByteBuffer in striping positional read
Date Wed, 07 Sep 2016 00:29:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15469075#comment-15469075
] 

Kai Zheng commented on HDFS-8901:
---------------------------------

Thanks [~zhz]. Can we have this now if it addressed all your questions? Not sure about it,
though much things to follow on to improve.

> 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
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Kai Zheng
>            Assignee: SammiChen
>         Attachments: HDFS-8901-v10.patch, HDFS-8901-v17.patch, HDFS-8901-v18.patch, HDFS-8901-v19.patch,
HDFS-8901-v2.patch, HDFS-8901-v20.patch, HDFS-8901-v3.patch, HDFS-8901-v4.patch, HDFS-8901-v5.patch,
HDFS-8901-v6.patch, HDFS-8901-v7.patch, HDFS-8901-v8.patch, HDFS-8901-v9.patch, HDFS-8901.v11.patch,
HDFS-8901.v12.patch, HDFS-8901.v13.patch, HDFS-8901.v14.patch, HDFS-8901.v15.patch, HDFS-8901.v16.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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