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KAFKA-4234; Revert automatic offset commit behavior in consumer's `unsubscribe()` 

Temporarily disable the offset commit (when auto commit is enabled) in the new consumer's `unsubscribe()` method towards a workaround for the issue reported in [KAFKA-3491](https://issues.apache.org/jira/browse/KAFKA-3491).
For now, a call to `unsubscribe()` can be made to reset the offsets in case processing the batch received from the most recent `poll()` is interrupted (due to some exception).

Author: Vahid Hashemian <vahidhashemian@us.ibm.com>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #1944 from vahidhashemian/KAFKA-4234
This commit is contained in:
Vahid Hashemian 2016-09-30 13:13:24 -07:00 committed by Jason Gustafson
parent 095475d481
commit 20322446aa
2 changed files with 1 additions and 15 deletions
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4
clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java
View File

@ -874,10 +874,6 @@ public class KafkaConsumer<K, V> implements Consumer<K, V> {
public void unsubscribe() {
acquire();
try {
// make sure the offsets of topic partitions the consumer is unsubscribing from
// are committed since there will be no following rebalance
this.coordinator.maybeAutoCommitOffsetsNow();
log.debug("Unsubscribed all topics or patterns and assigned partitions");
this.subscriptions.unsubscribe();
this.coordinator.maybeLeaveGroup();

12
clients/src/test/java/org/apache/kafka/clients/consumer/KafkaConsumerTest.java
View File

@ -614,8 +614,7 @@ public class KafkaConsumerTest {
* do not immediately change, and the latest consumed offsets of its to-be-revoked
* partitions are properly committed (when auto-commit is enabled).
* Upon unsubscribing from subscribed topics the consumer subscription and assignment
* are both updated right away and its consumed offsets are committed (if auto-commit
* is enabled).
* are both updated right away but its consumed offsets are not auto committed.
*/
@Test
public void testSubscriptionChangesWithAutoCommitEnabled() {
@ -722,21 +721,12 @@ public class KafkaConsumerTest {
assertTrue(consumer.assignment().size() == 2);
assertTrue(consumer.assignment().contains(tp0) && consumer.assignment().contains(t3p0));
// mock the offset commit response for to be revoked partitions
Map<TopicPartition, Long> partitionOffsets2 = new HashMap<>();
partitionOffsets2.put(tp0, 2L);
partitionOffsets2.put(t3p0, 100L);
commitReceived = prepareOffsetCommitResponse(client, coordinator, partitionOffsets2);
consumer.unsubscribe();
// verify that subscription and assignment are both cleared
assertTrue(consumer.subscription().isEmpty());
assertTrue(consumer.assignment().isEmpty());
// verify that the offset commits occurred as expected
assertTrue(commitReceived.get());
consumer.close();
}