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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11939) Ozone : add read/write random access to Chunks of a key
Date Wed, 06 Sep 2017 23:52:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156211#comment-16156211
] 

Hadoop QA commented on HDFS-11939:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  5s{color} | {color:red}
HDFS-11939 does not apply to HDFS-7240. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11939 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12872799/HDFS-11939-HDFS-7240.004.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/21030/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> 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
>          Components: ozone
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>              Labels: OzonePostMerge
>         Attachments: HDFS-11939-HDFS-7240.001.patch, HDFS-11939-HDFS-7240.002.patch,
HDFS-11939-HDFS-7240.003.patch, HDFS-11939-HDFS-7240.004.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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