GitHub user uncleGen opened a pull request:
https://github.com/apache/spark/pull/17209
[SPARK-19853][SS] uppercase kafka topics fail when startingOffsets are
SpecificOffsets
## What changes were proposed in this pull request?
When using the KafkaSource with Structured Streaming, consumer assignments
are not what the user expects if startingOffsets is set to an explicit set of
topics/partitions in JSON where the topic(s) happen to have uppercase
characters. When StartingOffsets is constructed, the original string value from
options is transformed toLowerCase to make matching on "earliest" and "latest"
case insensitive. However, the toLowerCase JSON is passed to SpecificOffsets
for the terminal condition, so topic names may not be what the user intended by
the time assignments are made with the underlying KafkaConsumer.
KafkaSourceProvider.scala:
```
val startingOffsets =
caseInsensitiveParams.get(STARTING_OFFSETS_OPTION_KEY).map(_.trim.toLowerCase)
match {
case Some("latest") => LatestOffsets
case Some("earliest") => EarliestOffsets
case Some(json) => SpecificOffsets(JsonUtils.partitionOffsets(json))
case None => LatestOffsets
}
```
## How was this patch tested?
Jenkins
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uncleGen/spark SPARK-19853
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17209.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 #17209
----
commit e2a26bf8fb8554fb030e7f5bd2197befb9ed55e2
Author: uncleGen <[email protected]>
Date: 2017-03-08T11:59:17Z
Uppercase Kafka topics fail when startingOffsets are SpecificOffsets
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