GitHub user uncleGen opened a pull request:
https://github.com/apache/spark/pull/16629
[SPARK-19185][DStream] Add more clear hint for
'ConcurrentModificationExceptions'
## What changes were proposed in this pull request?
When same kafka partition is consumed from multiple threads, task will fail
with `ConcurrentModificationExceptions`. KafkaConsumer is not safe for
multi-threaded access. So, we may give a more clear hint for users when
encounter problems. Besides, a new config
`spark.streaming.kafka.consumer.cache.enabled` is added for users to use
consumer cache or not
## How was this patch tested?
existing ut
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uncleGen/spark SPARK-19185
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16629.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 #16629
----
commit 384710db67fa2440f50ece4df64a8c1b996f7167
Author: uncleGen <husty...@gmail.com>
Date: 2017-01-18T03:08:49Z
Add more clear hint for 'ConcurrentModificationExceptions'
commit b8b44ef0c62267425fb2b8ed3ab16f10d303f7ca
Author: uncleGen <husty...@gmail.com>
Date: 2017-01-18T03:18:34Z
update
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