HDFS locking mechanisms should be simplified or removed
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Key: HADOOP-726
URL: http://issues.apache.org/jira/browse/HADOOP-726
Project: Hadoop
Issue Type: Improvement
Components: dfs
Reporter: Sameer Paranjpye
Priority: Minor
HDFS includes a locking mechanism that allows clients to lock files and
directories in the filesystem. This requires that the Namenode, in addition to
all other management of filesystem state also has to act like a lock manager on
behalf of clients. Rather than burden the Namenode with this Hadoop should
include a distinct general purpose distributed lock manager.
In the interim, the locking functionality on the filesystem should be
simplified to permit only file locks or removed altogether. At this point,
removing or simplifying the functionality is not likely to break client code,
removing it later will be much harder. In any case, locks in HDFS don't work
very well, see HADOOP-656. Also, directory locks are overkill most UNIX fses
don't support it.
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