angerszhu created HADOOP-17155:
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Summary: DF implementation of CachingGetSpaceUsed makes DFS Used
size not correct
Key: HADOOP-17155
URL: https://issues.apache.org/jira/browse/HADOOP-17155
Project: Hadoop Common
Issue Type: Sub-task
Reporter: angerszhu
When we calculate DN's storage used, we add each Volume's used size together
and each volume's size comes from it's BP's size.
When we use DF instead of DU, we know that DF check disk space usage (not disk
size of a directory). so when check BP dir path, What you're actually checking
is the corresponding disk directory space.
When we use this with federation, under each volume may have more than one BP,
each BP return it's corresponding disk directory space.
If we have two BP under one volume, we will make DN's storage info's Used size
double than real size.
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