[SPARK-6211][Streaming] Add Python Kafka API unit test

[jerryshao]

Refactor the Kafka unit test and add Python API support. CC @tdas @davies please help to review, thanks a lot.

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Test build #28427 has started for PR 4961 at commit d4f2e5b.

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Test build #28427 has finished for PR 4961 at commit d4f2e5b.

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  • class EmbeddedZookeeper(val zkConnect: String)

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Test build #28429 has started for PR 4961 at commit 4898694.

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Test build #28429 has finished for PR 4961 at commit 4898694.

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[jerryshao]

Jenkins, retest this please.

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Test build #28431 has started for PR 4961 at commit 4898694.

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Test build #28431 has finished for PR 4961 at commit 4898694.

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Test build #28458 has started for PR 4961 at commit f66a067.

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Test build #28458 has finished for PR 4961 at commit f66a067.

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• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class EmbeddedZookeeper(val zkConnect: String)

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[jerryshao]

Looks like maven command in run-tests script do not generate kafka-assembly fat jar, only a single module empty jar. I took a look at the pom file under kafka-assembly, actually has shade plugin and enabled under package, I'm not sure why mvn package from parent module cannot generate kafka-assembly fat jar, only one assembly jar in module assembly is generated, is it a bug or just the right behavior?

Currently what I did is to use mvn -am -pl "external/kafka-assembly" package to generate a fat jar, do you have any suggestions, @tdas. Thanks a lot.

[tdas]

This seems like a bug that was fixed couple of weeks ago. Are you sure you have merged with master recently. In fact the PR has merge conflicts.

[tdas]

Can you add one line to say why this is in /main and not /test.

[tdas]

Other than the assembly issue, its looks quite good. Only a few minor comments.

[jerryshao]

Thanks a lot @tdas for your review, actually I rebased the code in my local environment and tried to test again, seems a recent merged PR #3916 changed the behavior of pyspark, so previously --jars argument that can be worked in unit test are failed to work now, I'm trying to figure out a way to enable this in unit test.

[jerryshao]

Seems recent merged PR #5261 changed the script and make my test fail, I will fix it.

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Test build #29999 has started for PR 4961 at commit ee4b919.

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Test build #29999 has finished for PR 4961 at commit ee4b919.

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  • class ExternalListOfList(ExternalList):
  • class GroupByKey(object):
  • class ExternalGroupBy(ExternalMerger):
• This patch does not change any dependencies.

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[jerryshao]

Jenkins, retest this please.

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Test build #30006 has started for PR 4961 at commit ee4b919.

[tdas]

Jenkins, retest this please.
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#4961 (comment).

[tdas]

LGTM. Will merge if it passes.

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Test build #30006 has finished for PR 4961 at commit ee4b919.

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[tdas]

Merging this.

[tdas]

Thanks @jerryshao for doing this!