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https://issues.apache.org/jira/browse/CAMEL-12722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16577103#comment-16577103
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michael elbaz commented on CAMEL-12722:
---------------------------------------
Ok done so my conclusion about is that missing some synchronisation.
The scenario was:
1 - Increase the producer loop message to 1500
2 - Starting this camel route
{code:java}
from("kafka:product?brokers=localhost:9092&groupId=testGroup&clientId=testClient&autoCommitEnable=false&allowManualCommit=true&autoOffsetReset=earliest")
.routeId("foo")
.to("seda:out");
from("seda:out")
.to("log:TEST?level=WARN")
.process(e -> {
KafkaManualCommit manual =
e.getIn().getHeader(KafkaConstants.MANUAL_COMMIT, KafkaManualCommit.class);
manual.commitSync();
});
{code}
Then i got the `ConcurrentModificationException`
> java.util.ConcurrentModificationException: KafkaConsumer is not safe for
> multi-threaded access
> ----------------------------------------------------------------------------------------------
>
> Key: CAMEL-12722
> URL: https://issues.apache.org/jira/browse/CAMEL-12722
> Project: Camel
> Issue Type: Bug
> Components: camel-kafka
> Affects Versions: 2.22.0
> Reporter: michael elbaz
> Priority: Major
>
> I got an exception when i try to use manual commit on camel kafka component
>
> {code:java}
> from("kafka:{{kafka.hostname}}:{{kafka.port}}?topic={{kafka.topic}}&groupId={{kafka.consumer.groupid}}&autoCommitEnable=false&allowManualCommit=true")
> .process(new Processor() {
> @Override
> public void process(Exchange exchange) throws Exception {
> KafkaManualCommit manual =
>
> exchange.getIn().getHeader(KafkaConstants.MANUAL_COMMIT,
> KafkaManualCommit.class);
> manual.commitSync();
> }
> }).to("...")
> {code}
> The exception
> {code:java}
> Trace: java.util.ConcurrentModificationException: KafkaConsumer is not safe
> for multi-threaded access
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:1824)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.acquireAndEnsureOpen(KafkaConsumer.java:1808)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.commitSync(KafkaConsumer.java:1255)
> at
> org.apache.camel.component.kafka.DefaultKafkaManualCommit.commitOffset(DefaultKafkaManualCommit.java:60)
> at
> org.apache.camel.component.kafka.DefaultKafkaManualCommit.commitSync(DefaultKafkaManualCommit.java:51)
> {code}
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