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Vinayakumar B commented on HDFS-5453: ------------------------------------- Hi [~daryn], is there any update on this? Looking forward to your results and patch. Happy to review and help. Thanks. > 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 > Attachments: async_simulation.xlsx > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)