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Posted to hdfs-dev@hadoop.apache.org by "Lei Chang (Created) (JIRA)" <ji...@apache.org> on 2012/03/16 05:53:46 UTC

[jira] [Created] (HDFS-3107) HDFS truncate

HDFS truncate
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                 Key: HDFS-3107
                 URL: https://issues.apache.org/jira/browse/HDFS-3107
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: data-node, name-node
            Reporter: Lei Chang


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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