GitHub user yongtang opened a pull request:
https://github.com/apache/spark/pull/11981
[SPARK-14163][CORE] SumEvaluator and countApprox cannot reliably handle
RDDs of size 1.
## What changes were proposed in this pull request?
This fix fixes issues in SPARK-14163 where SumEvaluator could not handle
`counter.count <=` 1 as `degreesOfFreedom` requires `counter.count > 1`.
In this fix, `counter.count <= 1` is handled separately.
## How was this patch tested?
A manual test was done to make sure that no Exception is thrown for
`degreesOfFreedom`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yongtang/spark SPARK-14163
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11981.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 #11981
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commit f739dcd0bbb84bf5429ae75997b7d0c54c95ac22
Author: Yong Tang <[email protected]>
Date: 2016-03-26T23:19:54Z
[SPARK-14163][CORE] SumEvaluator and countApprox cannot reliably handle
RDDs of size 1.
This fix fixes issues in SPARK-14163 where SumEvaluator could not handle
counter.count of `<=` 1 as degreesOfFreedom requires counter.count > 1.
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