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From "Aaron T. Myers (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2989) HA: Optimize quota tracking for HA
Date Sat, 03 Mar 2012 01:39:54 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-2989:
---------------------------------

     Target Version/s: 0.24.0
    Affects Version/s:     (was: HA branch (HDFS-1623))
                       0.24.0

Converting to top-level issue with commit of HDFS-1623.
                
> 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: 0.24.0
>            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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