HA: Optimize quota tracking for HA
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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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