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Merge pull request #16 from jeremydavis02/jeremydavis02-lag-merge-branch
Merging our consumer lag metric additions
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125 changes: 125 additions & 0 deletions
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src/main/java/com/appdynamics/extensions/kafka/ConsumerGroupLag.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package com.appdynamics.extensions.kafka; | ||
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| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
| import java.util.Properties; | ||
| import java.util.Set; | ||
| import java.util.UUID; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.function.BinaryOperator; | ||
| import java.util.stream.Collectors; | ||
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| import org.apache.kafka.clients.admin.AdminClient; | ||
| import org.apache.kafka.clients.admin.AdminClientConfig; | ||
| import org.apache.kafka.clients.consumer.ConsumerConfig; | ||
| import org.apache.kafka.clients.consumer.KafkaConsumer; | ||
| import org.apache.kafka.clients.consumer.OffsetAndMetadata; | ||
| import org.apache.kafka.common.PartitionInfo; | ||
| import org.apache.kafka.common.TopicPartition; | ||
| import org.apache.kafka.common.serialization.StringDeserializer; | ||
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| public class ConsumerGroupLag { | ||
| private final String monitoringConsumerGroupID = "monitoring_consumer_" + UUID.randomUUID().toString(); | ||
| private AdminClient adminClient; | ||
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| public Map<TopicPartition, PartionOffsets> getConsumerGroupOffsets(String host, String topic, String groupId) { | ||
| Map<TopicPartition, Long> logEndOffset = getLogEndOffset(topic, host); | ||
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| Set<TopicPartition> topicPartitions = new HashSet<>(); | ||
| for (Entry<TopicPartition, Long> s : logEndOffset.entrySet()) { | ||
| topicPartitions.add(s.getKey()); | ||
| } | ||
| adminClient = getAdminClient(host); | ||
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| KafkaConsumer<String, Object> consumer = createNewConsumer(groupId, host); | ||
| Map<TopicPartition, OffsetAndMetadata> comittedOffsetMeta = consumer.committed(topicPartitions); | ||
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| BinaryOperator<PartionOffsets> mergeFunction = (a, b) -> { | ||
| throw new IllegalStateException(); | ||
| }; | ||
| Map<TopicPartition, PartionOffsets> result = logEndOffset.entrySet().stream() | ||
| .collect(Collectors.toMap(entry -> (entry.getKey()), entry -> { | ||
| OffsetAndMetadata committed = comittedOffsetMeta.get(entry.getKey()); | ||
| long currentOffset = 0; | ||
| if(committed != null) { //committed offset will be null for unknown consumer groups | ||
| currentOffset = committed.offset(); | ||
| } else { | ||
| currentOffset = entry.getValue(); //set current offset to same as end offset for unknown consumer groups | ||
| } | ||
| return new PartionOffsets(entry.getValue(), currentOffset, entry.getKey().partition(), topic); | ||
| }, mergeFunction)); | ||
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| return result; | ||
| } | ||
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| public Map<TopicPartition, Long> getLogEndOffset(String topic, String host) { | ||
| Map<TopicPartition, Long> endOffsets = new ConcurrentHashMap<>(); | ||
| KafkaConsumer<?, ?> consumer = createNewConsumer(monitoringConsumerGroupID, host); | ||
| List<PartitionInfo> partitionInfoList = consumer.partitionsFor(topic); | ||
| List<TopicPartition> topicPartitions = partitionInfoList.stream() | ||
| .map(pi -> new TopicPartition(topic, pi.partition())).collect(Collectors.toList()); | ||
| consumer.assign(topicPartitions); | ||
| consumer.seekToEnd(topicPartitions); | ||
| topicPartitions.forEach(topicPartition -> endOffsets.put(topicPartition, consumer.position(topicPartition))); | ||
| consumer.close(); | ||
| return endOffsets; | ||
| } | ||
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| private static KafkaConsumer<String, Object> createNewConsumer(String groupId, String host) { | ||
| Properties properties = new Properties(); | ||
| properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, host); | ||
| properties.put(ConsumerConfig.GROUP_ID_CONFIG, groupId); | ||
| properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false"); | ||
| properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class); | ||
| properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class); | ||
| return new KafkaConsumer<>(properties); | ||
| } | ||
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| private AdminClient getAdminClient(String host) { | ||
| Properties properties = new Properties(); | ||
| properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, host); | ||
| return AdminClient.create(properties); | ||
| } | ||
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| static class PartionOffsets { | ||
| public long lag; | ||
| private long timestamp = System.currentTimeMillis(); | ||
| public long endOffset; | ||
| public long currentOffset; | ||
| public int partition; | ||
| public String topic; | ||
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| public PartionOffsets(long endOffset, long currentOffset, int partition, String topic) { | ||
| this.endOffset = endOffset; | ||
| this.currentOffset = currentOffset; | ||
| this.partition = partition; | ||
| this.topic = topic; | ||
| this.lag = endOffset - currentOffset; | ||
| } | ||
| public long getLag() { | ||
| return lag; | ||
| } | ||
| public long getCurrentOffset() { | ||
| return currentOffset; | ||
| } | ||
| public long getEndOffset() { | ||
| return endOffset; | ||
| } | ||
| public int getPartition() { | ||
| return partition; | ||
| } | ||
| public String getTopic() { | ||
| return topic; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return "PartionOffsets [lag=" + lag + ", timestamp=" + timestamp + ", endOffset=" + endOffset | ||
| + ", currentOffset=" + currentOffset + ", partion=" + partition + ", topic=" + topic + "]"; | ||
| } | ||
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| } | ||
| } |
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