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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-89) files are not visible until they are closed
Date Mon, 01 Oct 2007 07:09:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12531423
] 

dhruba borthakur commented on HADOOP-89:
----------------------------------------

It is actually HADOOP-1708 that introduced the feature that "files appear in namespace as
soon as they are created". I changed the release notes (CHANGES.txt) to ensure that this change
appears in the INCOMPATIBLE section rather than in NEW FEATURES section.

> files are not visible until they are closed
> -------------------------------------------
>
>                 Key: HADOOP-89
>                 URL: https://issues.apache.org/jira/browse/HADOOP-89
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.1.0
>            Reporter: Yoram Arnon
>            Assignee: dhruba borthakur
>            Priority: Critical
>             Fix For: 0.15.0
>
>         Attachments: tail.patch, tail3.patch, tail4.patch
>
>
> the current behaviour, whereby a file is not visible until it is closed has several flaws,including:
> 1. no practical way to know if a file/job is progressing
> 2. no way to implement files that never close, such as log files
> 3. failure to close a file results in loss of the file
> The part of the file that's written should be visible.

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