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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4035) Modify the capacity scheduler (HADOOP-3445) to schedule tasks based on memory requirements and task trackers free memory
Date Mon, 03 Nov 2008 14:57:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644735#action_12644735
] 

Steve Loughran commented on HADOOP-4035:
----------------------------------------

>[He says, having just had to set some memory related values in another application that
ended up looking like 1073741824 . Nice and readable.... ]

There's a lot to be said for configuration languages with basic math operators, though then
you end up worrying about order of precedence so end up bracketing everything just to be sure

  dfs.namenode.decommission.interval  (5 * 60);

[He says, editing a .spec file where the ${} ant properties get expanded during build time
but the RPM may be rebuilt on a separate machine with the %{} properties expanded either at
rpmbuild time or on the target machine, and which trial and error seems the only way to be
sure what happens]

> Modify the capacity scheduler (HADOOP-3445) to schedule tasks based on memory requirements
and task trackers free memory
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4035
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4035
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.19.0
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod K V
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: 4035.1.patch, HADOOP-4035-20080918.1.txt, HADOOP-4035-20081006.1.txt,
HADOOP-4035-20081006.txt, HADOOP-4035-20081008.txt
>
>
> HADOOP-3759 introduced configuration variables that can be used to specify memory requirements
for jobs, and also modified the tasktrackers to report their free memory. The capacity scheduler
in HADOOP-3445 should schedule tasks based on these parameters. A task that is scheduled on
a TT that uses more than the default amount of memory per slot can be viewed as effectively
using more than one slot, as it would decrease the amount of free memory on the TT by more
than the default amount while it runs. The scheduler should make the used capacity account
for this additional usage while enforcing limits, etc.

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