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[FLINK-38381] Enumerate Kafka partitions across Kafka clusters #1030

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merged 2 commits into from
Sep 19, 2025
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[FLINK-38381] Enumerate Kafka partitions across Kafka clusters #1030

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[FLINK-38381] Enumerate Kafka partitions across Kafka clusters
mxm Sep 18, 2025
da26fdf
fixup! spotless
mxm Sep 18, 2025
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10 changes: 8 additions & 2 deletions flink-autoscaler/src/main/java/org/apache/flink/autoscaler/ScalingMetricCollector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -269,7 +269,7 @@ private void updateKafkaPulsarSourceNumPartitions(
try (var restClient = ctx.getRestClusterClient()) {
Pattern partitionRegex =
Pattern.compile(
"^.*\\.KafkaSourceReader\\.topic\\.(?<kafkaTopic>.+)\\.partition\\.(?<kafkaId>\\d+)\\.currentOffset$"
"^.*?(\\.kafkaCluster\\.(?<kafkaCluster>.+))?\\.KafkaSourceReader\\.topic\\.(?<kafkaTopic>.+)\\.partition\\.(?<kafkaId>\\d+)\\.currentOffset$"
+ "|^.*\\.PulsarConsumer\\.(?<pulsarTopic>.+)-partition-(?<pulsarId>\\d+)\\..*\\.numMsgsReceived$");
for (var vertexInfo : topology.getVertexInfos().values()) {
if (vertexInfo.getInputs().isEmpty()) {
Expand All @@ -281,12 +281,18 @@ private void updateKafkaPulsarSourceNumPartitions(
Matcher matcher = partitionRegex.matcher(v);
if (matcher.matches()) {
String kafkaTopic = matcher.group("kafkaTopic");
String kafkaCluster =
matcher.group("kafkaCluster");
String kafkaId = matcher.group("kafkaId");
String pulsarTopic =
matcher.group("pulsarTopic");
String pulsarId = matcher.group("pulsarId");
return kafkaTopic != null
? kafkaTopic + "-" + kafkaId
? kafkaCluster
+ "-"
+ kafkaTopic
+ "-"
+ kafkaId
: pulsarTopic + "-" + pulsarId;
}
return null;
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14 changes: 14 additions & 0 deletions ...oscaler/src/test/java/org/apache/flink/autoscaler/MetricsCollectionAndEvaluationTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -258,6 +258,20 @@ public void testKafkaPulsarNumPartitions() throws Exception {
collectedMetrics = metricsCollector.updateMetrics(context, stateStore);
assertEquals(5, collectedMetrics.getJobTopology().get(source1).getNumSourcePartitions());

metricsCollector.setMetricNames(
Map.of(
source1,
List.of(
"1.Source__Kafka_Source_(testTopic).kafkaCluster.my-cluster-1.KafkaSourceReader.topic.testTopic.partition.0.currentOffset",
"1.Source__Kafka_Source_(testTopic).kafkaCluster.my-cluster-1.KafkaSourceReader.topic.anotherTopic.partition.0.currentOffset",
"1.Source__Kafka_Source_(testTopic).kafkaCluster.my-cluster-2.KafkaSourceReader.topic.testTopic.partition.0.currentOffset",
"1.Source__Kafka_Source_(testTopic).kafkaCluster.my-cluster-2.KafkaSourceReader.topic.testTopic.partition.1.currentOffset",
"1.Source__Kafka_Source_(testTopic).kafkaCluster.my-cluster-2.KafkaSourceReader.topic.testTopic.partition.2.currentOffset",
"1.Source__Kafka_Source_(testTopic).kafkaCluster.my-cluster-2.KafkaSourceReader.topic.testTopic.partition.3.currentOffset")));

collectedMetrics = metricsCollector.updateMetrics(context, stateStore);
assertEquals(6, collectedMetrics.getJobTopology().get(source1).getNumSourcePartitions());

metricsCollector.setMetricNames(
Map.of(
source2,
Expand Down