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From "Alexander Fahlke (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, 04 Apr 2014 16:19:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13960092#comment-13960092
] 

Alexander Fahlke commented on HDFS-5215:
----------------------------------------

Have you considered that the underlying filesystem reserved space (ext3, ext4 -> tune2fs)
can also affect this behavior?
I'm not sure if this is a problem in hadoop-3.0.x anymore.

I recently opened a jira regarding this issue: https://issues.apache.org/jira/browse/HDFS-5926

> 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
>             Fix For: 3.0.0
>
>         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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