Github user njwhite commented on the pull request:
https://github.com/apache/spark/pull/12951#issuecomment-220555299
Thanks for the review @squito - I've commented on the JIRA about why this
feature would be useful. As for the implementation - maybe "maxShare" is the
wrong word, as the change doesn't relate to the fair scheduler at all. Instead
it limits the maximum number of tasks a `Schedulable` can have running at any
one time. It really is just a one line change - `resourceOffer` now won't
accept any more resources (i.e. won't run any of its tasks) if the calculated
current value of `maxShares` means there isn't any free space in the pool. The
`maxShares` method just returns the maximum number of tasks allowed in the
pool, minus the number of tasks running in the pool. You can see the
propagation of the `maxShares` limit in the assertions I added to the
`PoolSuite` test.
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