GitHub user MartinWeindel opened a pull request:
https://github.com/apache/mesos/pull/24
Fix for MESOS-1688
As already explained in
[MESOS-1688](https://issues.apache.org/jira/browse/MESOS-1688), there are
schedulers allocating memory only for the executor and not for tasks. For tasks
only CPU resources are allocated in this case.
Such a scheduler does not get offered any idle CPUs if the slave has nearly
used up all memory.
This can easily lead to a dead lock (in the application, not in Mesos).
Simple example:
1. Scheduler allocates all memory of a slave for an executor
2. Scheduler launches a task for this executor (allocating 1 CPU)
3. Task finishes: 1 CPU , 0 MB memory allocatable.
4. No offers are made, as no memory is left. Scheduler will wait of offers
forever. Dead lock in the application.
To fix this problem, offers must be made if either CPU or memory is
allocatable.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/MartinWeindel/mesos master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/mesos/pull/24.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #24
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commit 8d816e4582208802d319071e90ef4e1810960718
Author: Martin Weindel <[email protected]>
Date: 2014-08-25T12:30:51Z
fix for MESOS-1688
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