GitHub user JoshRosen opened a pull request:
https://github.com/apache/spark/pull/12741
[SPARK-14966] SizeEstimator should ignore classes in the scala.reflect
package
In local profiling, I noticed SizeEstimator spending tons of time
estimating the size of objects which contain TypeTag or ClassTag fields. The
problem with these tags is that they reference global Scala reflection objects,
which, in turn, reference many singletons, such as TestHive. This throws off
the accuracy of the size estimation and wastes tons of time traversing a huge
object graph.
As a result, I think that SizeEstimator should ignore any classes in the
`scala.reflect` package.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JoshRosen/spark
ignore-scala-reflect-in-size-estimator
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12741.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 #12741
----
commit e51c7e8ffb6e672048c148c1b686f579b631326a
Author: Josh Rosen <[email protected]>
Date: 2016-04-27T20:29:51Z
Ignore scala.reflect classes in SizeEstimator.
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