GitHub user aosagie opened a pull request:
https://github.com/apache/spark/pull/18499
[SPARK-21176][WEB UI] Use a single ProxyServlet to proxy all workers and
applications
## What changes were proposed in this pull request?
Currently, each application and each worker creates their own proxy
servlet. Each proxy servlet is backed by its own HTTP client and a relatively
large number of selector threads. This is excessive but was fixed (to an
extent) by https://github.com/apache/spark/pull/18437.
However, a single HTTP client (backed by a single selector thread) should
be enough to handle all proxy requests. This PR creates a single proxy servlet
no matter how many applications and workers there are.
## How was this patch tested?
The unit tests for rewriting proxied locations and headers were updated. I
then spun up a 100 node cluster to ensure that proxy'ing worked correctly and
was scalable.
@jiangxb1987 Please let me know if there's anything else I can do to help
push this thru. Thanks!
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aosagie/spark fix/minimize-proxy-threads
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18499.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 #18499
----
commit 2b907df1f56e36c6265e8ada59843bb456a24943
Author: Anderson Osagie <osa...@gmail.com>
Date: 2017-07-01T08:02:48Z
[SPARK-21176][WEB UI] Use a single ProxyServlet to proxy all workers and
applications
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