[jira] [Created] (KAFKA-19327) MM2 Source Connector Fails at Scale

[Ed Berezitsky (Jira)]

Ed Berezitsky created KAFKA-19327:
-------------------------------------

             Summary: MM2 Source Connector Fails at Scale
                 Key: KAFKA-19327
                 URL: https://issues.apache.org/jira/browse/KAFKA-19327
             Project: Kafka
          Issue Type: Bug
          Components: mirrormaker
    Affects Versions: 3.7.2
            Reporter: Ed Berezitsky


We are running MM2 to replicate about 1000+ topics with about 25K partitions or 
something like that.

{{The MM2 Source Connector fails to start with topics=.*}}

The Exception:

 
{code:java}
[2025-05-23 16:51:06,501] WARN Could not create topic 
<just_one_of_hundreds_failed_topics>. 
(org.apache.kafka.connect.mirror.MirrorSourceConnector)
java.util.concurrent.CompletionException: 
org.apache.kafka.common.errors.PolicyViolationException: Unable to perform 
excessively large batch operation.
    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(Unknown 
Source)
    at 
java.base/java.util.concurrent.CompletableFuture.completeThrowable(Unknown 
Source)
    at 
java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown 
Source)
    at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown 
Source)
    at 
java.base/java.util.concurrent.CompletableFuture.completeExceptionally(Unknown 
Source)
    at 
org.apache.kafka.common.internals.KafkaCompletableFuture.kafkaCompleteExceptionally(KafkaCompletableFuture.java:49)
    at 
org.apache.kafka.common.internals.KafkaFutureImpl.completeExceptionally(KafkaFutureImpl.java:130)
    at 
org.apache.kafka.clients.admin.KafkaAdminClient$1.handleResponse(KafkaAdminClient.java:1845)
    at 
org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.handleResponses(KafkaAdminClient.java:1397)
    at 
org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.processRequests(KafkaAdminClient.java:1550)
    at 
org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.run(KafkaAdminClient.java:1473)
    at java.base/java.lang.Thread.run(Unknown Source) {code}
 

 

MM2 Source Connector tries to create all the topics in a[ single 
request|https://github.com/apache/kafka/blob/trunk/connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorSourceConnector.java#L518].
 And fails...

 



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