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Date: Mon, 6 Oct 2008 15:20:44 -0700 (PDT)
From: "Raghu Angadi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4292) append() does not work for
 LocalFileSystem
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    [ https://issues.apache.org/jira/browse/HADOOP-4292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637278#action_12637278 ] 

Raghu Angadi commented on HADOOP-4292:
--------------------------------------

> Even only the CRC file is truncated, fail in append could result in data-checksum inconsistency. How could we fix this?
We could seek to the right position and start writing from there. If that is not allowed, we could copy the crc file. 

For this jira, we can implement this for LocalFS (and any simpler Filesystems), the default implementation at ChecksumFS could be to throw unsupported exception.

> append() does not work for LocalFileSystem
> ------------------------------------------
>
>                 Key: HADOOP-4292
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4292
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.18.0, 0.19.0
>            Reporter: Raghu Angadi
>            Assignee: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.18.2, 0.19.0
>
>
> append is supported by LocalFileSystem but it does not update crc when a file is appended. 
> When you enable checksum verification {{TestLocalFileSystem.testAppend}} fails. Since HADOOP-4277 is a blocker for 0.17  I am planning to disable this test in HADOOP-4277.

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