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From "Lei Chang (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3107) HDFS truncate
Date Fri, 16 Mar 2012 04:53:46 GMT
HDFS truncate
-------------

                 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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