Chia-Ping Tsai created KAFKA-21409:
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Summary: Switching to a subscription regex that matches no topic
doesn't trigger rebalance
Key: KAFKA-21409
URL: https://issues.apache.org/jira/browse/KAFKA-21409
Project: Kafka
Issue Type: Bug
Reporter: Chia-Ping Tsai
Assignee: Chia-Ping Tsai
{code:java}
ResolvedRegularExpression newResolvedRegularExpression = entry.getValue();
ResolvedRegularExpression oldResolvedRegularExpression = group
.resolvedRegularExpression(regex)
.orElse(ResolvedRegularExpression.EMPTY);
if
(!oldResolvedRegularExpression.topics().equals(newResolvedRegularExpression.topics()))
{
{code}
Since ResolvedRegularExpression.EMPTY has no topics which is equal to
"match-to-nothing", the condition won't get passed. The side effect is that the
partitions won't be reassigned to other consumers.
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