GitHub user rdblue opened a pull request:
https://github.com/apache/spark/pull/11612
SPARK-13779: Avoid cancelling non-local container requests.
## What changes were proposed in this pull request?
To maximize locality, the YarnAllocator would cancel any requests with a
stale locality preference or no locality preference. This assumed that
the majority of tasks had locality preferences, but may not be the case
when scanning S3. This caused container requests for S3 tasks to be
constantly cancelled and resubmitted.
This changes the allocator's logic to cancel only stale requests and
just enough requests without locality preferences to submit requests
with locality preferences. This avoids cancelling requests without
locality preferences that would be resubmitted without locality
preferences.
## How was this patch tested?
We've deployed this patch on our clusters and verified that jobs that
couldn't get executors because they kept canceling and resubmitting requests
are fixed. Large jobs are running fine.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rdblue/spark
SPARK-13779-fix-yarn-allocator-requests
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11612.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 #11612
----
commit a67fb2824300da82236e7315dae8b4b507a71296
Author: Ryan Blue <b...@apache.org>
Date: 2016-02-26T23:07:54Z
SPARK-13779: Avoid cancelling non-local container requests.
To maximize locality, the YarnAllocator would cancel any requests with a
stale locality preference or no locality preference. This assumed that
the majority of tasks had locality preferences, but may not be the case
when scanning S3. This caused container requests for S3 tasks to be
constantly cancelled and resubmitted.
This changes the allocator's logic to cancel only stale requests and
just enough requests without locality preferences to submit requests
with locality preferences. This avoids cancelling requests without
locality preferences that would be resubmitted without locality
preferences.
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