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https://issues.apache.org/jira/browse/HADOOP-3250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591116#action_12591116
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dhruba borthakur commented on HADOOP-3250:
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+1 on Doug's proposal.
If the path exists and is not being written to, then append() will return a
OutputStream to the file. If the path does not exist, then append will generate
a IOException.
The DFSClient will issue ClientProtocol.append() call to the namenode. If the
file was being written to by another writer but it has exceeded the soft-lease
period, then the namenode would *start* a distributed lease recovery. However,
it will not make the client wait for the recovery to complete. The namenode
will return an AlreadyBeingCreatedException as if the soft-limit has not yet
expired.
> Extend FileSystem API to allow appending to files
> -------------------------------------------------
>
> Key: HADOOP-3250
> URL: https://issues.apache.org/jira/browse/HADOOP-3250
> Project: Hadoop Core
> Issue Type: New Feature
> Components: fs
> Reporter: dhruba borthakur
>
> Provide an API to allow applications to append data to pre-existing files.
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