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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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Hairong Kuang updated HADOOP-1463:
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Attachment: usedSpace.patch
This patch made the following changes:
1. dfs_used_space is set by running "du" every block report interval (default 1
hour) and then gets adjusted when a block is written or deleted.
2. dfs_remaing_space is caculated by the following formula:
MIN( Total_Capacity - dfs_used_space - dfs.datanode.du.reserved,
cur_disk_available) * dfs.datanode.du.pct
where Total_Capacity and cur_disk_available is set by running "df" every df
interval (default 1 min)
3. Every heartbeat sends 3 disk metrics, total_capacity, dfs_used_space, and
dfs_reamaining_space, to the namenode
4. Namenode keeps track of all 3 metrics and reports to dfsadmin shell & Web UI
all 3 metrics.
5. Fix some minor number formatting bugs in FSShell.
> 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
> Assignee: Hairong Kuang
> Attachments: 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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