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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2989) HA: Optimize quota tracking for HA
Date Wed, 22 Feb 2012 23:45:48 GMT
HA: Optimize quota tracking for HA
----------------------------------

                 Key: HDFS-2989
                 URL: https://issues.apache.org/jira/browse/HDFS-2989
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha, name-node
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Todd Lipcon
            Priority: Minor


Currently after each segment we read in on the standby, we re-calculate all of the quota/usage
information throughout the directory tree. This is inefficient. There are two potential optimizations:
(a) we could maintain the quotas incrementally as edits are read, or (b) we could defer all
quota computation until the node transitions to active mode. (b) is probably less bug-prone.

This is not a crucial optimization since in the worst case it might just delay failover by
a few extra seconds (the time to traverse the in-memory FSDirectory)

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