Daryn Sharp created HDFS-5453:
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Summary: Support fine grain locking in FSNamesystem
Key: HDFS-5453
URL: https://issues.apache.org/jira/browse/HDFS-5453
Project: Hadoop HDFS
Issue Type: New Feature
Components: namenode
Affects Versions: 2.0.0-alpha, 3.0.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
The namesystem currently uses a course grain lock to control access. This
prevents concurrent writers in different branches of the tree, and prevents
readers from accessing branches that writers aren't using.
Features that introduce latency to namesystem operations, such as cold storage
of inodes, will need fine grain locking to avoid degrading the entire
namesystem's throughput.
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