THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- RecordCollector and it's implementation RecordCollectorImpl has the method which accepts a StreamPartitioner object and pushes it to the partitions returned by the partition method. This is the core piece of logic which would allow multi/broadcasting records. Here are the high level changes. Note that when the
partitions()
method return an empty set meaning we won't send the record to any partition, we would also be updating the droppedRecordsSensor.Code Block language java @Override public <K, V> void send(final String topic, final K key, final V value, final Headers headers, final Long timestamp, final Serializer<K> keySerializer, final Serializer<V> valueSerializer, final StreamPartitioner<? super K, ? super V> partitioner) { if (partitioner != null) { // Existing logic to fetch partitions // Changes to be made due to the KIP if (partitions.size() > 0) { final Optional<Set<Integer>> maybeMulticastPartitions = partitioner.partitions(topic, key, value, partitions.size()); if (!maybeMulticastPartitions.isPresent()) { // New change. Use default partitioner send(topic, key, value, headers, null, timestamp, keySerializer, valueSerializer, processorNodeId, context); } else { Set<Integer> multicastPartitions = maybeMulticastPartitions.get(); if (multicastPartitions.isEmpty()) { // If a record is not to be sent to any partitionspartition, mark it as a dropped record. log.info("Not sending the record to any partition"); droppedRecordsSensor.record(); } else { for (final int multicastPartition: multicastPartitions) { send(topic, key, value, headers, multicastPartition, timestamp, keySerializer, valueSerializer, processorNodeId, context); } } } } else { throw new StreamsException("Could not get partition information for topic " + topic + " for task " + taskId + ". This can happen if the topic does not exist."); } } else { send(topic, key, value, headers, null, timestamp, keySerializer, valueSerializer, processorNodeId, context); } }
- StreamPartitioner is also used in FK-join and Interactive queries. The invocation of
partition()
would be replaced bypartitions()
and a runtime check would be added to ensure that the returned set is singleton.
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