dfs should report total size of all the space that dfs is using
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Key: HADOOP-1463
URL: https://issues.apache.org/jira/browse/HADOOP-1463
Project: Hadoop
Issue Type: Improvement
Components: dfs
Affects Versions: 0.12.3
Reporter: Hairong Kuang
Fix For: 0.14.0
Currently namenode reports two statistics back to the client:
1. The total capacity of dfs. This is a sum of all datanode's capacities, each
of which is calculated by datanode summing all data directories disk space.
2. The total remaining space of dfs. This is a sum of all datanodes's remaining
space. Each datanode's remaining space is calculated by using the following
formula: remaining space = unused space - capacity*unusableDiskPercentage -
reserved space. So the remaining space shows how much space that the dfs can
still use, but it does not show the size of unused space.
Each dfs client caculates the total dfs used space by substracting remaining
space from the total capacity. So the used space does not accurately shows the
space that dfs is using. However it is a very important number that dfs should
provide.
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