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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1463) dfs.datanode.du.reserved semantics being violated
Date Mon, 10 Mar 2008 19:50:46 GMT

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

Joydeep Sen Sarma updated HADOOP-1463:
--------------------------------------

             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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