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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5224) Disable append
Date Wed, 18 Feb 2009 05:02:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674454#action_12674454

Nigel Daley commented on HADOOP-5224:

Hi folks, please pardon me for re-opening this issue. I am wondering if there is a better
way to disable "appends" for 0.19.1 We coudld set the config parameter dfs.support.append
to false in hadoop-defaults.xml. This means that a default installation of hadoop will not
support "appends". However, for people that are testing their apps (not in production), it
gives them an easy way to test their apps. 
Dhruba, folks who want to test with append can use 0.19.0.

There could be big-and-large warning message associated with the dfs.support.append parameter
warning people to the fact that there could be data corruption if they set that flag to true.
The uploaded patch creates a dfs.support.append config entry but doesn't seem to use it in
the append method to affect it's behavior.  What am I missing?

I am re-opening this issue because I am not sure whether this approach was considered. If
it was considered and was shot down, please let me know why and u can close this issue.
I think this should be a new Jira that could be fixed in 0.19.2.  If you agree, please close
this and open a new Jira.

> Disable append
> --------------
>                 Key: HADOOP-5224
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5224
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs, libhdfs
>    Affects Versions: 0.19.0
>            Reporter: Nigel Daley
>            Priority: Blocker
>             Fix For: 0.19.1
>         Attachments: disableAppend.patch, HADOOP-5224.patch
> As discussed on core-dev@ (http://www.nabble.com/Hadoop-0.19.1-td21739202.html) we will
disable append API in Hadoop 0.19.1 by throwing UnsupportedOperationException from FileSystem.append(...)
> Does append in libhdfs (HADOOP-4494) need attention too?

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