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https://issues.apache.org/jira/browse/HDFS-3107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14155485#comment-14155485
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Jing Zhao edited comment on HDFS-3107 at 10/1/14 8:52 PM:
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Actually I agree with [~cmccabe] that it's better to finish HDFS-7056 before
committing the current patch into trunk, especially considering the patch
contains a DistributedFileSystem API already. Thus a feature branch makes sense
to me.
I have not thought through the details about HDFS-7056 yet. But it does not
seem to be a very hard problem. I will also be happy to help there.
was (Author: jingzhao):
Actually I agree with [~cmccabe] that it's better to finish HDFS-7056 before
committing the current patch into trunk, especially considering the patch
contains a DistributedFileSystem API already. Thus a feature branch makes sense
to me.
I have not thought through the details about HDFS-7056 yet. But it does not
seem to be a very hard issue. I will also be happy to help there.
> HDFS truncate
> -------------
>
> Key: HDFS-3107
> URL: https://issues.apache.org/jira/browse/HDFS-3107
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Reporter: Lei Chang
> Assignee: Plamen Jeliazkov
> Attachments: HDFS-3107.patch, HDFS-3107.patch, HDFS-3107.patch,
> HDFS-3107.patch, HDFS-3107.patch, HDFS_truncate.pdf, HDFS_truncate.pdf,
> HDFS_truncate_semantics_Mar15.pdf, HDFS_truncate_semantics_Mar21.pdf,
> editsStored
>
> Original Estimate: 1,344h
> Remaining Estimate: 1,344h
>
> Systems with transaction support often need to undo changes made to the
> underlying storage when a transaction is aborted. Currently HDFS does not
> support truncate (a standard Posix operation) which is a reverse operation of
> append, which makes upper layer applications use ugly workarounds (such as
> keeping track of the discarded byte range per file in a separate metadata
> store, and periodically running a vacuum process to rewrite compacted files)
> to overcome this limitation of HDFS.
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