GitHub user sasakitoa opened a pull request:
https://github.com/apache/spark/pull/17462
[SPARK-20050][DStream] Kafka 0.10 DirectStream doesn't commit last
processed batch's offset when graceful shutdown
## What changes were proposed in this pull request?
When we use KafkaDirectStream(Kafka0.10) with `enable.auto.commit` is
`false`,
some record's offsets do not commit to Kafka at graceful shutdown, such
below.
Sample code
```
val kafkaParams = Map[String, Object]("enable.auto.commit" -> "false")
val kafkaStream = KafkaUtils.createDirectStream[String, String](ssc, ... ,
kafkaParams.asScala)
kafkaStream.map { input =>
"key: " + input.key.toString + " value: " + input.value.toString + "
offset: " + input.offset.toString
}.foreachRDD { rdd =>
rdd.foreach { input =>
println(input)
}
}
kafkaStream.foreachRDD { rdd =>
val offsetRanges = rdd.asInstanceOf[HasOffsetRanges].offsetRanges
kafkaStream.asInstanceOf[CanCommitOffsets].commitAsync(offsetRanges)
}
```
output at first time
```
key: null value: 1 offset: 101452472
key: null value: 2 offset: 101452473
key: null value: 3 offset: 101452474
key: null value: 4 offset: 101452475
key: null value: 5 offset: 101452476
key: null value: 6 offset: 101452477
key: null value: 7 offset: 101452478
key: null value: 8 offset: 101452479
key: null value: 9 offset: 101452480 // this is a last record before
shutdown Spark Streaming gracefully
```
output at second time
```
key: null value: 7 offset: 101452478 // duplicate
key: null value: 8 offset: 101452479 // duplicate
key: null value: 9 offset: 101452480 // duplicate
key: null value: 10 offset: 101452481
```
This is because offset will commit at the beginning of each batches, and
will not commit after all batches processed.
## How was this patch tested?
Added tests `offset commit when graceful shtudown` in
`DirectKafkaStreamSuite.scala`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sasakitoa/spark Kafka010commitAsync2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17462.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 #17462
----
commit e7b218b877b15075a370b16909fb32e1b9865bb0
Author: Sasaki Toru <[email protected]>
Date: 2017-03-28T22:14:04Z
Invoke DirectkafkaInputDStream#commitAll when graceful shutdown
----
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