QueryDB

  We observed couple of errors / info messages while running Spark Streaming Applications, which might come  handy for debugging in future. Refer below -  1) We noticed that Spark streaming Job was running but consuming nothing. We could see following messages being iteratively printed in logs -  22/11/18 08:13:53 INFO AbstractCoordinator: [Consumer clientId=consumer-1, groupId=difnrt-uat-001] Group coordinator mymachine.com:9093 (id: 601150796 rack: null) is unavailable or invalid, will attempt rediscovery 22/11/18 08:13:53 INFO AbstractCoordinator: [Consumer clientId=consumer-1, groupId=difnrt-uat-001] Discovered group coordinator mymachine.com:9093 (id: 601150796 rack: null) 22/11/18 08:13:53 INFO AbstractCoordinator: [Consumer clientId=consumer-1, groupId=difnrt-uat-001] (Re-)joining group Possible Causes / Fixes -  May be due to Kafka Coordinator service. Try restarting Kafka it may fix the issue.  In our case, we couldn't get help from Admin Team. So, we changed "group.i

  While Running Spark Streaming application, we observed following exception -  Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 7.0 failed 4 times, most recent failure: Lost task 0.3 in stage 7.0 (TID 410, mymachine.com, executor 2): org.apache.kafka.clients.consumer.OffsetOutOfRangeException: Offsets out of range with no configured reset policy for partitions: {mygrouidid=233318826} at org.apache.kafka.clients.consumer.internals.Fetcher.initializeCompletedFetch(Fetcher.java:1260) at org.apache.kafka.clients.consumer.internals.Fetcher.fetchedRecords(Fetcher.java:607) at org.apache.kafka.clients.consumer.KafkaConsumer.pollForFetches(KafkaConsumer.java:1313) at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1240) at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1168) at org.apache.spark.streaming.kafka010.InternalKafkaConsumer.poll(KafkaDataConsumer.scala:200) at org.apache.spark.streaming.ka