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Date: Fri, 3 Apr 2015 06:06:54 +0000 (UTC)
From: "Jing Zhao (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12774432.1423715266000.115646.1428041214379@Atlassian.JIRA>
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Subject: [jira] [Updated] (HDFS-7782) Erasure coding: pread from files in
 striped layout
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     [ https://issues.apache.org/jira/browse/HDFS-7782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jing Zhao updated HDFS-7782:
----------------------------
    Attachment: HDFS-7782.007.patch

So I just extended Zhe's 005 and 006 patch and tried to demo the idea that avoiding either data copy or recreating BlockReader by extending the current {{actualGetFromOneDataNode}} method.

Still need to add more tests and find/fix possible bugs. But please see if this way makes sense in general.

> Erasure coding: pread from files in striped layout
> --------------------------------------------------
>
>                 Key: HDFS-7782
>                 URL: https://issues.apache.org/jira/browse/HDFS-7782
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Li Bo
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7782-000.patch, HDFS-7782-001.patch, HDFS-7782-002.patch, HDFS-7782-003.patch, HDFS-7782-004.patch, HDFS-7782-005.patch, HDFS-7782-006.patch, HDFS-7782.007.patch
>
>
> If client wants to read a file, he is not necessary to know and handle what layout the file is. This sub task adds logic to DFSInputStream to support reading striping layout files.


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