GitHub user JoshRosen opened a pull request:
https://github.com/apache/spark/pull/15922
[SPARK-18462] Fix ClassCastException in SparkListenerDriverAccumUpdates
event
## What changes were proposed in this pull request?
This patch fixes a `ClassCastException: java.lang.Integer cannot be cast to
java.lang.Long` error which could occur in the HistoryServer while trying to
process a deserialized `SparkListenerDriverAccumUpdates` event.
The problem stems from `jackson-module-scala` handles primitive type
parameters (see
https://github.com/FasterXML/jackson-module-scala/wiki/FAQ#deserializing-optionint-and-other-primitive-challenges
for more details). This was causing a problem where our code expected a field
to be deserialized as a `(Long, Long)` tuple but we got an `(Int, Int)` tuple
instead.
This patch hacks around this issue by registering a custom `Converter` with
Jackson in order to deserialize the tuples as `(Object, Object)` and perform
the appropriate casting.
## How was this patch tested?
New regression tests in `SQLListenerSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JoshRosen/spark SPARK-18462
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15922.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 #15922
----
commit 0dcad4b1502ec8c7c45e17e4a8029545d7337e2a
Author: Josh Rosen <[email protected]>
Date: 2016-11-16T01:17:58Z
Add failing regression test.
commit 9f674be5efd72cf58e2139343202904f26e14966
Author: Josh Rosen <[email protected]>
Date: 2016-11-18T00:06:12Z
Add fix using custom Jackson converter.
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