[SPARK-49442][SS] Cache Kafka partition metadata to reduce DescribeTopics RPCs per micro-batch#57351
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vinodkc wants to merge 1 commit into
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[SPARK-49442][SS] Cache Kafka partition metadata to reduce DescribeTopics RPCs per micro-batch#57351vinodkc wants to merge 1 commit into
vinodkc wants to merge 1 commit into
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HeartSaVioR
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Jul 20, 2026
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+1 but let's see whether it's possible to give more room for the potential flakiness test issue.
| val topic = newTopic() | ||
| testUtils.createTopic(topic, partitions = 3) | ||
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| val ttlMs = 200 // short TTL so the test doesn't need to sleep long |
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Generally I'd give more room for slow CI, especially the fact that we run embedded kafka cluster and rely on it, which could also give a fluctuated performance under slow CI.
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What changes were proposed in this pull request?
Adds a new source option
partition.metadata.cache.ttl.mstoKafkaOffsetReaderAdmin. When set to a positive value, the driver caches the set of assignedTopicPartitions and reuses it for all offset fetch calls within the TTL window, skipping theDescribeTopicsRPC to the broker. The cache is invalidated on admin reset (i.e., on retry). Default is-1(caching disabled, preserving existing behavior).Why are the changes needed?
Every micro-batch unconditionally called
consumerStrategy.assignedTopicPartitions(admin), which issues aDescribeTopicsRPC to the Kafka broker even though partition assignments are stable in most production deployments. For deployments with large partition counts and short trigger intervals, this generates unnecessary metadata traffic.Does this PR introduce any user-facing change?
Yes. Adds a new source option
partition.metadata.cache.ttl.ms(long, default-1). Valid values are-1(caching disabled) or any positive integer representing milliseconds. Documentation is updated accordingly. Existing behavior is unchanged when the option is not set.How was this patch tested?
Added tests in
KafkaOffsetReaderSuiteKafkaSourceProviderSuite,KafkaOffsetReaderSuiteandKafkaSourceProviderSuite.Was this patch authored or co-authored using generative AI tooling?
Yes, 'Generated-by: Claude (Sonnet 4.6)