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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5215) dfs.datanode.du.reserved is not taking effect as it's not considered while getting the available space
Date Fri, 20 Mar 2015 02:22:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370584#comment-14370584
] 

Yongjun Zhang commented on HDFS-5215:
-------------------------------------

Hi [~brahmareddy],

I studied the callers of {{DF#getAvailable()}} including {{LocalDirAllocator#getLocalPathForWrite}}
a little more and realize that they don't need to be aware of the {{reserved}} space specified
by  {{dfs.datanode.du.reserved}}. So we don't need to touch the implementation in DF.java.

Sorry for the forth and back.


> dfs.datanode.du.reserved is not taking effect as it's not considered while getting the
available space
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5215
>                 URL: https://issues.apache.org/jira/browse/HDFS-5215
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 3.0.0
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: HDFS-5215.patch
>
>
> {code}public long getAvailable() throws IOException {
>     long remaining = getCapacity()-getDfsUsed();
>     long available = usage.getAvailable();
>     if (remaining > available) {
>       remaining = available;
>     }
>     return (remaining > 0) ? remaining : 0;
>   } 
> {code}
> Here we are not considering the reserved space while getting the Available Space.



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