GitHub user jerryshao opened a pull request:
https://github.com/apache/spark/pull/6430
[SPARK-7699][Core] Lazy start the scheduler for dynamic allocation
This patch propose to lazy start the scheduler for dynamic allocation to
avoid fast ramp down executor numbers is load is less.
This implementation will:
1. immediately start the scheduler is `numExecutorsTarget` is 0, this is
the expected behavior.
2. if `numExecutorsTarget` is not zero, start the scheduler until the
number is satisfied, if the load is less, this initial started executors will
last for at least 60 seconds, user will have a window to submit a job, no need
to revamp the executors.
3. if `numExecutorsTarget` is not satisfied until the timeout, this means
resource is not enough, the scheduler will start until this timeout, will not
wait infinitely.
Please help to review, thanks a lot.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jerryshao/apache-spark SPARK-7699
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6430.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 #6430
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commit 25af47b6680370465c5f012ba48760424bc1c8ce
Author: jerryshao <[email protected]>
Date: 2015-05-27T06:50:50Z
Lazy start the scheduler for dynamic allocation
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