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Date: Fri, 9 Jun 2017 17:46:18 +0000 (UTC)
From: "Chen Liang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13077834.1496789779000.40862.1497030378210@Atlassian.JIRA>
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References: <JIRA.13077834.1496789779000@Atlassian.JIRA> <JIRA.13077834.1496789779730@jira-lw-us.apache.org>
Subject: [jira] [Updated] (HDFS-11939) Ozone : add read/write random access
 to Chunks of a key
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archived-at: Fri, 09 Jun 2017 17:46:23 -0000


     [ https://issues.apache.org/jira/browse/HDFS-11939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chen Liang updated HDFS-11939:
------------------------------
    Attachment: HDFS-11939-HDFS-7240.001.patch

> Ozone : add read/write random access to Chunks of a key
> -------------------------------------------------------
>
>                 Key: HDFS-11939
>                 URL: https://issues.apache.org/jira/browse/HDFS-11939
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>         Attachments: HDFS-11939-HDFS-7240.001.patch
>
>
> In Ozone, the value of a key is a sequence of container chunks. Currently, the only way to read/write the chunks is by using ChunkInputStream and ChunkOutputStream. However, by the nature of streams, these classes are currently implemented to only allow sequential read/write. 
> Ideally we would like to support random access of the chunks. For example, we want to be able to seek to a specific offset and read/write some data. This will be critical for key range read/write feature, and potentially important for supporting parallel read/write.
> This JIRA tracks adding support by implementing FileChannel class on top Chunks.


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