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Date: Thu, 12 Feb 2009 17:51:59 -0800 (PST)
From: "Robert Chansler (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5224) Disable append
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    [ https://issues.apache.org/jira/browse/HADOOP-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673114#action_12673114 ] 

Robert Chansler commented on HADOOP-5224:
-----------------------------------------

This particular item turns off _append()_ at the interface without affecting the implementation or normal behavior of _sync()_. 
A related item, Hadoop-5225, disables some of the recovery code associated with sync in the case of data node failure.

The use of either of these facilities in 0.19.0 is dangerous to the integrity of the file system. The goal is to provide 0.19.1 with the same file system integrity as 0.18.3. Further development of append and sync recovery can then continue.


> 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
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.19.1
>
>
> 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(...) methods.
> Does append in libhdfs (HADOOP-4494) need attention too?

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