Hi Team, Kindly let me know if I am doing something wrong.
Kafka Version - kafka_2.11-0.10.1.1 Flink Version - flink-1.2.0 Using the latest Kafka Connector - FlinkKafkaConsumer010 - flink-connector-kafka-0.10_2.11 Issue Faced: Not able to get the consumer offsets from Kafka when using Flink with Flink-Kafka Connector $ /work/kafka_2.11-0.10.1.1/bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list console-consumer-19886 console-consumer-89637 $ It does not show the consumer group "test" For a group that does not exist, the message is as follows: $ /work/kafka_2.11-0.10.1.1/bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group test1 --describe Consumer group `test1` does not exist. $ For the "test" group the error message is as follows $ /work/kafka_2.11-0.10.1.1/bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group test --describe Error while executing consumer group command Group test with protocol type '' is not a valid consumer group java.lang.IllegalArgumentException: Group test with protocol type '' is not a valid consumer group at kafka.admin.AdminClient.describeConsumerGroup(AdminClient.scala:152) at kafka.admin.ConsumerGroupCommand$KafkaConsumerGroupService.describeGroup( ConsumerGroupCommand.scala:308) at kafka.admin.ConsumerGroupCommand$ConsumerGroupService$class. describe(ConsumerGroupCommand.scala:89) at kafka.admin.ConsumerGroupCommand$KafkaConsumerGroupService. describe(ConsumerGroupCommand.scala:296) at kafka.admin.ConsumerGroupCommand$.main(ConsumerGroupCommand.scala:68) at kafka.admin.ConsumerGroupCommand.main(ConsumerGroupCommand.scala) $ The error is from the AdminClient.scala (https://github.com/apache/ kafka/blob/trunk/core/src/main/scala/kafka/admin/AdminClient.scala) if (metadata.state != "Dead" && metadata.state != "Empty" && metadata.protocolType != ConsumerProtocol.PROTOCOL_TYPE) throw new IllegalArgumentException(s"Consumer Group $groupId with protocol type '${metadata.protocolType}' is not a valid consumer group") Code: import java.util.Properties; import org.apache.flink.streaming.api.datastream.DataStreamSource; import org.apache.flink.streaming.api.environment. StreamExecutionEnvironment; import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010; import org.apache.flink.streaming.util.serialization.SimpleStringSchema; public class KafkaFlinkOutput { private static final String LOCAL_ZOOKEEPER_HOST = "localhost:2181"; private static final String LOCAL_KAFKA_BROKER = "localhost:9092"; private static final String CONSUMER_GROUP = "test"; public KafkaFlinkOutput() { } public static void main(String[] args) throws Exception { StreamExecutionEnvironment env = StreamExecutionEnvironment. getExecutionEnvironment(); Properties kafkaProps = new Properties(); kafkaProps.setProperty("zookeeper.connect", "localhost:2181"); kafkaProps.setProperty("bootstrap.servers", "localhost:9092"); kafkaProps.setProperty("group.id", "test"); kafkaProps.setProperty("auto.offset.reset", "latest"); env.enableCheckpointing(1000L); FlinkKafkaConsumer010 consumer = new FlinkKafkaConsumer010("testIn1", new SimpleStringSchema(), kafkaProps); DataStreamSource consumerData = env.addSource(consumer); consumerData.print(); System.out.println("Streaming Kafka in Flink"); env.execute("Starting now!"); } } Debug Logs that show that Kafka Connector does commit to Kafka: 2017-02-07 09:52:38,851 INFO org.apache.kafka.clients.consumer.ConsumerConfig - ConsumerConfig values: metric.reporters = [] metadata.max.age.ms = 300000 partition.assignment.strategy = [org.apache.kafka.clients. consumer.RangeAssignor] reconnect.backoff.ms = 50 sasl.kerberos.ticket.renew.window.factor = 0.8 max.partition.fetch.bytes = 1048576 bootstrap.servers = [localhost:9092] ssl.keystore.type = JKS enable.auto.commit = true sasl.mechanism = GSSAPI interceptor.classes = null exclude.internal.topics = true ssl.truststore.password = null client.id = ssl.endpoint.identification.algorithm = null max.poll.records = 2147483647 <02147%20483%20647> check.crcs = true request.timeout.ms = 40000 heartbeat.interval.ms = 3000 auto.commit.interval.ms = 5000 receive.buffer.bytes = 65536 ssl.truststore.type = JKS ssl.truststore.location = null ssl.keystore.password = null fetch.min.bytes = 1 send.buffer.bytes = 131072 value.deserializer = class org.apache.kafka.common.serialization. ByteArrayDeserializer group.id = test retry.backoff.ms = 100 sasl.kerberos.kinit.cmd = /usr/bin/kinit sasl.kerberos.service.name = null sasl.kerberos.ticket.renew.jitter = 0.05 ssl.trustmanager.algorithm = PKIX ssl.key.password = null fetch.max.wait.ms = 500 sasl.kerberos.min.time.before.relogin = 60000 connections.max.idle.ms = 540000 session.timeout.ms = 30000 metrics.num.samples = 2 key.deserializer = class org.apache.kafka.common.serialization. ByteArrayDeserializer ssl.protocol = TLS ssl.provider = null ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1] ssl.keystore.location = null ssl.cipher.suites = null security.protocol = PLAINTEXT ssl.keymanager.algorithm = SunX509 metrics.sample.window.ms = 30000 auto.offset.reset = latest 2017-02-07 09:53:38,524 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Sending heartbeat to JobManager 2017-02-07 09:53:38,731 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Triggering checkpoint 12 @ 1486486418731 2017-02-07 09:53:38,731 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver TriggerCheckpoint 12@1486486418731 for cfe59bc4aadc96e5a2235581460e9f3d. 2017-02-07 09:53:38,731 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Trigger for Source: Custom Source -> Sink: Unnamed (1/4) (cfe59bc4aadc96e5a2235581460e9f3d). on task Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver TriggerCheckpoint 12@1486486418731 for 5611d20817d9a49680117c9ab000116c. 2017-02-07 09:53:38,732 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Trigger for Source: Custom Source -> Sink: Unnamed (2/4) (5611d20817d9a49680117c9ab000116c). on task Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver TriggerCheckpoint 12@1486486418731 for 58e5bc1040fc99f8d3f0a32c2bd524b6. 2017-02-07 09:53:38,732 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Trigger for Source: Custom Source -> Sink: Unnamed (3/4) (58e5bc1040fc99f8d3f0a32c2bd524b6). on task Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,732 INFO org.apache.flink.core.fs.FileSystem - Created new CloseableRegistry org.apache.flink.core.fs. SafetyNetCloseableRegistry@26590268 for Async calls on Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Starting checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver TriggerCheckpoint 12@1486486418731 for 95ad7256919d3296b37d17693cd0ba71. 2017-02-07 09:53:38,732 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Trigger for Source: Custom Source -> Sink: Unnamed (4/4) (95ad7256919d3296b37d17693cd0ba71). on task Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,732 INFO org.apache.flink.core.fs.FileSystem - Created new CloseableRegistry org.apache.flink.core.fs. SafetyNetCloseableRegistry@2b3c1766 for Async calls on Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Starting checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,732 INFO org.apache.flink.core.fs.FileSystem - Created new CloseableRegistry org.apache.flink.core.fs. SafetyNetCloseableRegistry@2c4eb75a for Async calls on Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Starting checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Finished synchronous checkpoints for checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (2/4) - finished synchronous part of checkpoint 12.Alignment duration: 0 ms, snapshot duration 0 ms 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Finished synchronous checkpoints for checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,732 INFO org.apache.flink.core.fs.FileSystem - Ensuring all FileSystem streams are closed for Async calls on Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,732 INFO org.apache.flink.core.fs.FileSystem - Created new CloseableRegistry org.apache.flink.core.fs. SafetyNetCloseableRegistry@b0b9bf0 for Async calls on Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Starting checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (1/4) - finished asynchronous part of checkpoint 12. Asynchronous duration: 0 ms 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Finished synchronous checkpoints for checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Finished synchronous checkpoints for checkpoint 12 on task Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (3/4) - finished synchronous part of checkpoint 12.Alignment duration: 0 ms, snapshot duration 0 ms 2017-02-07 09:53:38,733 INFO org.apache.flink.core.fs.FileSystem - Ensuring all FileSystem streams are closed for Async calls on Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (2/4) - finished asynchronous part of checkpoint 12. Asynchronous duration: 0 ms 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (3/4) - finished asynchronous part of checkpoint 12. Asynchronous duration: 0 ms 2017-02-07 09:53:38,732 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (1/4) - finished synchronous part of checkpoint 12.Alignment duration: 0 ms, snapshot duration 0 ms 2017-02-07 09:53:38,733 INFO org.apache.flink.core.fs.FileSystem - Ensuring all FileSystem streams are closed for Async calls on Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (4/4) - finished asynchronous part of checkpoint 12. Asynchronous duration: 0 ms 2017-02-07 09:53:38,733 DEBUG org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Received acknowledge message for checkpoint 12 from task 5611d20817d9a49680117c9ab000116c of job ef5998a3d1cbba24cb1790564f3037bf. 2017-02-07 09:53:38,733 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Source: Custom Source -> Sink: Unnamed (4/4) - finished synchronous part of checkpoint 12.Alignment duration: 0 ms, snapshot duration 0 ms 2017-02-07 09:53:38,734 INFO org.apache.flink.core.fs.FileSystem - Ensuring all FileSystem streams are closed for Async calls on Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Received acknowledge message for checkpoint 12 from task 58e5bc1040fc99f8d3f0a32c2bd524b6 of job ef5998a3d1cbba24cb1790564f3037bf. 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Received acknowledge message for checkpoint 12 from task 95ad7256919d3296b37d17693cd0ba71 of job ef5998a3d1cbba24cb1790564f3037bf. 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Received acknowledge message for checkpoint 12 from task cfe59bc4aadc96e5a2235581460e9f3d of job ef5998a3d1cbba24cb1790564f3037bf. 2017-02-07 09:53:38,734 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Completed checkpoint 12 (4490 bytes in 3 ms). 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Checkpoint state: TaskState(jobVertexID: cbc357ccb763df2852fee8c4fc7d55f2, parallelism: 4, sub task states: 4, total size (bytes): 4490) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver ConfirmCheckpoint 12@1486486418731 for cfe59bc4aadc96e5a2235581460e9f3d. 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Confirmation for Source: Custom Source -> Sink: Unnamed (1/4) on task Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver ConfirmCheckpoint 12@1486486418731 for 5611d20817d9a49680117c9ab000116c. 2017-02-07 09:53:38,734 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Notification of complete checkpoint for task Source: Custom Source -> Sink: Unnamed (1/4) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Confirmation for Source: Custom Source -> Sink: Unnamed (2/4) on task Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Committing offsets to Kafka/ZooKeeper for checkpoint 12 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver ConfirmCheckpoint 12@1486486418731 for 58e5bc1040fc99f8d3f0a32c2bd524b6. 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Confirmation for Source: Custom Source -> Sink: Unnamed (3/4) on task Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Notification of complete checkpoint for task Source: Custom Source -> Sink: Unnamed (2/4) 2017-02-07 09:53:38,734 DEBUG org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Committing offsets to Kafka/ZooKeeper for checkpoint 12 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Notification of complete checkpoint for task Source: Custom Source -> Sink: Unnamed (3/4) 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Committing offsets to Kafka/ZooKeeper for checkpoint 12 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming. connectors.kafka.internal.Kafka09Fetcher - Sending async offset commit request to Kafka broker 2017-02-07 09:53:38,734 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Receiver ConfirmCheckpoint 12@1486486418731 for 95ad7256919d3296b37d17693cd0ba71. 2017-02-07 09:53:38,735 DEBUG org.apache.flink.runtime.taskmanager.Task - Invoking async call Checkpoint Confirmation for Source: Custom Source -> Sink: Unnamed (4/4) on task Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,735 DEBUG org.apache.kafka.clients.consumer.KafkaConsumer - Committing offsets: {testIn1-1=OffsetAndMetadata{offset=17421, metadata=''}, testIn1-5=OffsetAndMetadata{offset=0, metadata=''}, testIn1-9=OffsetAndMetadata{offset=17493, metadata=''}} 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming.runtime.tasks.StreamTask - Notification of complete checkpoint for task Source: Custom Source -> Sink: Unnamed (4/4) 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Committing offsets to Kafka/ZooKeeper for checkpoint 12 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming. connectors.kafka.internal.Kafka09Fetcher - Sending async offset commit request to Kafka broker 2017-02-07 09:53:38,735 DEBUG org.apache.kafka.clients.consumer.KafkaConsumer - Committing offsets: {testIn1-0=OffsetAndMetadata{offset=34926, metadata=''}, testIn1-4=OffsetAndMetadata{offset=17325, metadata=''}, testIn1-8=OffsetAndMetadata{offset=17564, metadata=''}} 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming. connectors.kafka.internal.Kafka09Fetcher - Sending async offset commit request to Kafka broker 2017-02-07 09:53:38,736 DEBUG org.apache.kafka.clients.consumer.KafkaConsumer - Committing offsets: {testIn1-3=OffsetAndMetadata{offset=52292, metadata=''}, testIn1-7=OffsetAndMetadata{offset=0, metadata=''}} 2017-02-07 09:53:38,735 DEBUG org.apache.flink.streaming. connectors.kafka.internal.Kafka09Fetcher - Sending async offset commit request to Kafka broker 2017-02-07 09:53:38,736 DEBUG org.apache.kafka.clients.consumer.KafkaConsumer - Committing offsets: {testIn1-2=OffsetAndMetadata{offset=0, metadata=''}, testIn1-6=OffsetAndMetadata{offset=17438, metadata=''}} 2017-02-07 09:53:38,737 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 0 for partition testIn1-5 2017-02-07 09:53:38,737 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 17493 for partition testIn1-9 2017-02-07 09:53:38,737 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 17421 for partition testIn1-1 2017-02-07 09:53:38,737 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 17325 for partition testIn1-4 2017-02-07 09:53:38,738 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 17564 for partition testIn1-8 2017-02-07 09:53:38,738 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 34926 for partition testIn1-0 2017-02-07 09:53:38,738 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 0 for partition testIn1-7 2017-02-07 09:53:38,738 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 52292 for partition testIn1-3 2017-02-07 09:53:38,738 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 17438 for partition testIn1-6 2017-02-07 09:53:38,738 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Group test committed offset 0 for partition testIn1-2 2017-02-07 09:53:43,524 DEBUG org.apache.flink.runtime.taskmanager.TaskManager - Sending heartbeat to JobManager 2017-02-07 09:53:43,730 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Triggering checkpoint 13 @ 1486486423730 -- Mahesh Kumar Ravindranathan Data Streaming Engineer Oracle Marketing Cloud - Social Platform Contact No:+1(720)492-4445
