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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1463) dfs should report total size of all the space that dfs is using
Date Tue, 05 Jun 2007 18:09:25 GMT
dfs should report total size of all the space that dfs is using

                 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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