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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8901) Use ByteBuffer in striping positional read
Date Fri, 02 Sep 2016 14:59:23 GMT

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

SammiChen updated HDFS-8901:
----------------------------
    Attachment: HDFS-8901-v19.patch

1. fix TestSnapshotFileLength test failure 
2. fix 2 checkstyle issues. the remaining one is a false alert. 

> 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: SammiChen
>         Attachments: HDFS-8901-v10.patch, HDFS-8901-v17.patch, HDFS-8901-v18.patch, HDFS-8901-v19.patch,
HDFS-8901-v2.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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