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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8852) HDFS architecture documentation of version 2.x is outdated about append write support
Date Tue, 11 Aug 2015 04:13:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14681214#comment-14681214
] 

Hadoop QA commented on HDFS-8852:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |   3m 11s | Pre-patch trunk compilation is healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags.
|
| {color:green}+1{color} | release audit |   0m 21s | The applied patch does not increase
the total number of release audit warnings. |
| {color:green}+1{color} | site |   2m 56s | Site still builds. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
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| | |   6m 32s | |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12749753/HDFS-8852.patch |
| Optional Tests | site |
| git revision | trunk / fa1d84a |
| Java | 1.7.0_55 |
| uname | Linux asf900.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep
3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/11958/console |


This message was automatically generated.

> HDFS architecture documentation of version 2.x is outdated about append write support
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-8852
>                 URL: https://issues.apache.org/jira/browse/HDFS-8852
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Hong Dai Thanh
>            Assignee: Ajith S
>              Labels: newbie
>         Attachments: HDFS-8852.patch
>
>
> In the [latest version of the documentation|http://hadoop.apache.org/docs/current2/hadoop-project-dist/hadoop-hdfs/HdfsDesign.html#Simple_Coherency_Model],
and also documentation for all releases with version 2, it’s mentioned that “A file once
created, written, and closed need not be changed. “ and “There is a plan to support appending-writes
to files in the future.” 
>  
> However, as far as I know, HDFS has supported append write since 0.21, based on [HDFS-265|https://issues.apache.org/jira/browse/HDFS-265]
and [the old version of the documentation in 2012|https://web.archive.org/web/20121221171824/http://hadoop.apache.org/docs/hdfs/current/hdfs_design.html#Appending-Writes+and+File+Syncs]
> Various posts on the Internet also suggests that append write has been available in HDFS,
and will always be available in Hadoop version 2 branch.
>  
> Can we update the documentation to reflect the current status?
> (Please also review whether the documentation should also be updated for version 0.21
and above, and the version 1.x branch)



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