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https://issues.apache.org/jira/browse/HADOOP-6319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767614#action_12767614
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Allen Wittenauer commented on HADOOP-6319:
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This is an edge-case that I discussed with Yahoo!'s HDFS team a long time back
that lead me to the conclusion that one is still better off specifying a max
size rather than trying to guess capacity and do negative math. Needless to
say, I lost.
In this particular edge-case, I think the fix would work. I'd still rate it as
risky since there are likely other filesystems (especially pool based) that
have similar df outputs, however where capacity is not used+avail.
Although I'm curious about one thing.
Why not just create another filesystem in this ZFS pool rather than using the
root filesystem? A ZFS file system is significantly faster for Hadoop
operations than using UFS. [... yes, I've tested it.] As an added bonus, you
avoid this issue. :)
> Capacity reporting incorrect on Solaris
> ---------------------------------------
>
> Key: HADOOP-6319
> URL: https://issues.apache.org/jira/browse/HADOOP-6319
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.20.1
> Reporter: Doug Judd
> Attachments: solaris-hadoop.patch
>
>
> When trying to get Hadoop up and running on Solaris on a ZFS filesystem, I
> encountered a problem where the capacity reported was zero:
> Configured Capacity: 0 (0 KB)
> It looks like the problem is with the 'df' output:
> $ df -k /data/hadoop
> Filesystem 1024-blocks Used Available Capacity Mounted on
> / 0 7186354 20490274 26% /
> The following patch (applied to trunk) fixes the problem. Though the real
> problem is with 'df', I suspect the patch is harmless enough to include?
> Index: src/java/org/apache/hadoop/fs/DF.java
> ===================================================================
> --- src/java/org/apache/hadoop/fs/DF.java (revision 826471)
> +++ src/java/org/apache/hadoop/fs/DF.java (working copy)
> @@ -181,7 +181,11 @@
> this.percentUsed = Integer.parseInt(tokens.nextToken());
> this.mount = tokens.nextToken();
> break;
> - }
> + }
> +
> + if (this.capacity == 0)
> + this.capacity = this.used + this.available;
> +
> }
>
> public static void main(String[] args) throws Exception {
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