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https://issues.apache.org/jira/browse/HADOOP-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joydeep Sen Sarma updated HADOOP-1463:
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Priority: Blocker (was: Major)
Issue Type: Bug (was: Improvement)
Affects Version/s: (was: 0.12.3)
0.15.3
0.16.0
Summary: dfs.datanode.du.reserved semantics being violated (was:
dfs should report total size of all the space that dfs is using)
folks - the implementation does not agree with the semantics discussed in the
jira (or the semantics in 0.14)
reserved is not taken off available. That's a bug. what's available is what the
OS reports minus the reserve setting.
> dfs.datanode.du.reserved semantics being violated
> -------------------------------------------------
>
> Key: HADOOP-1463
> URL: https://issues.apache.org/jira/browse/HADOOP-1463
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.15.3, 0.16.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.15.0
>
> Attachments: usedSpace.patch, usedSpace.patch
>
>
> 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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