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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5790) LeaseManager.findPath is very slow when many leases need recovery
Date Thu, 16 Jan 2014 20:51:21 GMT
Todd Lipcon created HDFS-5790:
---------------------------------

             Summary: LeaseManager.findPath is very slow when many leases need recovery
                 Key: HDFS-5790
                 URL: https://issues.apache.org/jira/browse/HDFS-5790
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode, performance
    Affects Versions: 2.4.0
            Reporter: Todd Lipcon


We recently saw an issue where the NN restarted while tens of thousands of files were open.
The NN then ended up spending multiple seconds for each commitBlockSynchronization() call,
spending most of its time inside LeaseManager.findPath(). findPath currently works by looping
over all files held for a given writer, and traversing the filesystem for each one. This takes
way too long when tens of thousands of files are open by a single writer.



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