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https://issues.apache.org/jira/browse/MAPREDUCE-5311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13740733#comment-13740733
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Bikas Saha commented on MAPREDUCE-5311:
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Let me understand this a bit.
There is existing yarn.min config. This is used by schedulers to do their
internal logic. MR AM uses this same config. This is not optimal but has the
virtue of being simple and relatively error free since there is only 1 config
to change.
If we change yarn.min to yarn.sched-name.min and introduce mr.min for MR then
who will keep both of these in sync. Also the sync value depends on the
scheduler being currently used. This is also sub optimal but is less preferable
than the former because 1) new config 2) manual synch of 2 configs based on
scheduler being used.
If YARN-1004 doesnt touch yarn.min then we are good. Currently both schedulers
are using the min values and will probably continue to use it for the
foreseeable future. IMO yarn.max is not scheduler specific. Its an admin config
that must be enforced by any scheduler. Lets just leave these configs as they
are because removing them is causing more grief than gain (including this
jira). And let MR use these configs to do internal calculations. I wish we had
more foresight earlier and done the right thing for slot_millis when we wrote
the original code.
> Replace SLOTS_MILLIS counters with MEM_MILLIS
> ---------------------------------------------
>
> Key: MAPREDUCE-5311
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5311
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster
> Affects Versions: 2.0.4-alpha
> Reporter: Alejandro Abdelnur
> Assignee: Sandy Ryza
> Priority: Blocker
> Fix For: 2.1.0-beta
>
> Attachments: MAPREDUCE-5311-1.patch, MAPREDUCE-5311.patch,
> MAPREDUCE-5311.patch
>
>
> Per discussion in MAPREDUCE-5310 and comments in the code we should remove
> all the related logic and just leave the counter constant for backwards
> compatibility and deprecate the counter constants.
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