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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