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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1463) dfs should report total size of all the space that dfs is using
Date Wed, 06 Jun 2007 19:07:26 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12502045

Raghu Angadi commented on HADOOP-1463:

+1. Except that during block report we should probably reset with 'du' instead of summing
over block sizes, so that it takes all the other overhead of Datanode directory into account
( native filesystem, directories, 'previous' directories, metadata files, tmp directory etc).
But it could be updated with block sizes as you described. Accrued error till next block report
would be small.

> 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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