GitHub user wingchen opened a pull request:
https://github.com/apache/spark/pull/4146
add in tuple handling while converting form python RDD back to JavaRDD
Existing `SerDeUtil.pythonToJava` implementation does not count in tuple
cases: Pyrolite `python tuple` => `java Object[]`.
So with the following data:
```
[
(u'2', {u'director': u'David Lean', u'genres': (u'Adventure', u'Biography',
u'Drama'), u'title': u'Lawrence of Arabia', u'year': 1962}),
(u'7', {u'director': u'Andrew Dominik', u'genres': (u'Biography', u'Crime',
u'Drama'), u'title': u'The Assassination of Jesse James by the Coward Robert
Ford', u'year': 2007})
]
```
Exceptions happen with the `genres` part:
```
15/01/16 10:28:31 ERROR Executor: Exception in task 0.0 in stage 3.0 (TID 7)
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to
java.util.ArrayList
at
org.apache.spark.api.python.SerDeUtil$$anonfun$pythonToJava$1$$anonfun$apply$1.apply(SerDeUtil.scala:157)
at
org.apache.spark.api.python.SerDeUtil$$anonfun$pythonToJava$1$$anonfun$apply$1.apply(SerDeUtil.scala:153)
at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)
at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:308)
```
This pull request adds in tuple handling both in `SerDeUtil.pythonToJava`
and `JavaToWritableConverter.convertToWritable`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wingchen/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4146.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 #4146
----
commit 9f1a097af5362c923607991023d29bd4f455959e
Author: Winston Chen <[email protected]>
Date: 2015-01-21T22:21:12Z
add in tuple handling while converting form python RDD back to JavaRDD
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