GitHub user srowen opened a pull request:
https://github.com/apache/spark/pull/15321
[SPARK-17671] [WEBUI] Spark 2.0 history server summary page is slow even
set spark.history.ui.maxApplications
## What changes were proposed in this pull request?
Return Iterator of applications internally in history server, for
consistency and performance. See https://github.com/apache/spark/pull/15248 for
some back-story.
The code called by and calling HistoryServer.getApplicationList wants an
Iterator, but this method materializes an Iterable, which potentially causes a
performance problem. It's simpler too to make this internal method also pass
through an Iterator.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/srowen/spark SPARK-17671
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15321.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 #15321
----
commit 14fb9a0b9fbc41fbbfbba5daab4e8998eaa857fc
Author: Sean Owen <[email protected]>
Date: 2016-10-01T20:25:42Z
Return Iterator of applications internally in history server, for
consistency and performance
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