[jira] [Created] (KAFKA-10370) WorkerSinkTask: IllegalStateException cased by consumer.seek(tp, offsets) when (tp, offsets) are supplied by WorkerSinkTaskContext

["Ning Zhang (Jira)" <ji...@apache.org>]

Ning Zhang created KAFKA-10370:
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             Summary: WorkerSinkTask: IllegalStateException cased by consumer.seek(tp, offsets) when (tp, offsets) are supplied by WorkerSinkTaskContext
                 Key: KAFKA-10370
                 URL: https://issues.apache.org/jira/browse/KAFKA-10370
             Project: Kafka
          Issue Type: New Feature
          Components: KafkaConnect
    Affects Versions: 2.5.0
            Reporter: Ning Zhang
            Assignee: Ning Zhang
             Fix For: 2.6.0


In WorkerSinkTask.java, when we want the consumer to start consuming from certain offsets, rather than from the last committed offset, [WorkerSinkTaskContext|https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSinkTask.java#L295] is used to carry the offsets from external world (e.g. implementation of SinkTask).

In the [poll() method|https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSinkTask.java#L312], it first call "rewind()" to (1) read the offsets from WorkerSinkTaskContext, (2) consumer.seek(tp, offset) to rewind the consumer.

when running (2), we saw the following IllegalStateException:
```
java.lang.IllegalStateException: No current assignment for partition mytopic-1
    at org.apache.kafka.clients.consumer.internals.SubscriptionState.assignedState(SubscriptionState.java:251)
    at org.apache.kafka.clients.consumer.internals.SubscriptionState.seek(SubscriptionState.java:276)
    at org.apache.kafka.clients.consumer.KafkaConsumer.seek(KafkaConsumer.java:1135)
```

As suggested in https://stackoverflow.com/questions/41008610/kafkaconsumer-0-10-java-api-error-message-no-current-assignment-for-partition/41010594, the resolution is to use *consumer.assign* with *consumer.seek* , instead of *consumer.subscribe*



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