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https://issues.apache.org/jira/browse/HADOOP-4292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637185#action_12637185
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Hairong Kuang commented on HADOOP-4292:
---------------------------------------

Another option is that we could have a positional write interface instead of 
having a truncate interface. Something like:
{code}
interface PositionalWritableFileSystem {
   // Return an output stream with the given pos as its current position; next 
write will write to the current position
   FSOutputStream append(File file, long pos);
}
{code}


> 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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