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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7811) Avoid recursive call getStoragePolicyID in INodeFile#computeQuotaUsage
Date Wed, 18 Feb 2015 23:18:11 GMT
Xiaoyu Yao created HDFS-7811:
--------------------------------

             Summary: Avoid recursive call getStoragePolicyID in INodeFile#computeQuotaUsage
                 Key: HDFS-7811
                 URL: https://issues.apache.org/jira/browse/HDFS-7811
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


This is a follow up based on comment from [~jingzhao] on HDFS-7723. 

I just noticed that INodeFile#computeQuotaUsage calls getStoragePolicyID to identify the storage
policy id of the file. This may not be very efficient (especially when we're computing the
quota usage of a directory) because getStoragePolicyID may recursively check the ancestral
INode's storage policy. I think here an improvement can be passing the lowest parent directory's
storage policy down while traversing the tree. 



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