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From "Pete Wyckoff (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2991) dfs.du.reserved not honored in 0.15/16 (regression from 0.14+patch for 2549)
Date Tue, 11 Mar 2008 18:12:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577539#action_12577539
] 

Pete Wyckoff commented on HADOOP-2991:
--------------------------------------

Also,

I am still interested in a real life example where this is actually useful -this would really
help people understand the motivation.  and please, not in the theoretical sense of someone
wants to set aside 50 GB for a mysql db, but rather some person is actually using this in
an installation of 10s of machines to set aside 50 GB on EVERY node for a mysql db.

Thanks,
-- pete


> dfs.du.reserved not honored in 0.15/16 (regression from 0.14+patch for 2549)
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-2991
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2991
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.16.0
>            Reporter: Joydeep Sen Sarma
>            Priority: Critical
>
> changes for https://issues.apache.org/jira/browse/HADOOP-1463
> have caused a regression. earlier:
> - we could set dfs.du.reserve to 1G and be *sure* that 1G would not be used.
> now this is no longer true. I am quoting Pete Wyckoff's example:
> <example>
> Let's look at an example. 100 GB disk and /usr using 45 GB and dfs using 50 GBs now
> Df -kh shows:
> Capacity = 100 GB
> Available = 1 GB (remember ~4 GB chopped out for metadata and stuff)
> Used = 95 GBs   
> remaining = 100 GB - 50 GB - 1GB = 49 GB 
> Min(remaining, available) = 1 GB
> 98% of which is usable for DFS apparently - 
> So, we're at the limit, but are free to use 98% of the remaining 1GB.
> </example>
> this is broke. based on the discussion on 1463 - it seems like the notion of 'capacity'
as being the first field of 'df' is problematic. For example - here's what our df output looks
like:
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda3             130G  123G   49M 100% /
> as u can see - 'Size' is a misnomer - that much space is not available. Rather the actual
usable space is 123G+49M ~ 123G. (not entirely sure what the discrepancy is due to - but have
heard this may be due to space reserved for file system metadata). Because of this discrepancy
- we end up in a situation where file system is out of space.

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