Hello, When I start an oozie workflow, then regardless of action type(sqoop, spark or ssh) it always fails with the same error from syslog: 2019-04-08 14:54:33,393 ERROR [pool-10-thread-1] org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl: Response from the timeline server is not successful, HTTP error code: 500, Server response: {"exception":"WebApplicationException","message":"org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 280 actions: IOException: 280 times, servers with issues: null","javaClassName":"javax.ws.rs.WebApplicationException"} 2019-04-08 14:54:33,394 ERROR [Job ATS Event Dispatcher] org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler: Exception while publishing configs on JOB_SUBMITTED Event  for the job : job_1554726387894_0011 org.apache.hadoop.yarn.exceptions.YarnException: Failed while publishing entity     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl$TimelineEntityDispatcher.dispatchEntities(TimelineV2ClientImpl.java:548)     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl.putEntities(TimelineV2ClientImpl.java:149)     at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.publishConfigsOnJobSubmittedEvent(JobHistoryEventHandler.java:1254)     at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.processEventForNewTimelineService(JobHistoryEventHandler.java:1414)     at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.handleTimelineEvent(JobHistoryEventHandler.java:742)     at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.access$1200(JobHistoryEventHandler.java:93)     at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler$ForwardingEventHandler.handle(JobHistoryEventHandler.java:1795)     at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler$ForwardingEventHandler.handle(JobHistoryEventHandler.java:1791)     at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:197)     at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:126)     at java.lang.Thread.run(Thread.java:748) Caused by: org.apache.hadoop.yarn.exceptions.YarnException: Response from the timeline server is not successful, HTTP error code: 500, Server response: {"exception":"WebApplicationException","message":"org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 280 actions: IOException: 280 times, servers with issues: null","javaClassName":"javax.ws.rs.WebApplicationException"}     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl.putObjects(TimelineV2ClientImpl.java:322)     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl.putObjects(TimelineV2ClientImpl.java:251)     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl$EntitiesHolder$1.call(TimelineV2ClientImpl.java:374)     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl$EntitiesHolder$1.call(TimelineV2ClientImpl.java:367)     at java.util.concurrent.FutureTask.run(FutureTask.java:266)     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl$TimelineEntityDispatcher$1.publishWithoutBlockingOnQueue(TimelineV2ClientImpl.java:478)     at org.apache.hadoop.yarn.client.api.impl.TimelineV2ClientImpl$TimelineEntityDispatcher$1.run(TimelineV2ClientImpl.java:433)     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) What is causing this error? example workflow.xml <workflow-app xmlns = "uri:oozie:workflow:0.4" name="hadoop_main_workflow">     <!-- start -->     <start to = "spark_job"/>     <action name="spark_job" retry-max="5" retry-interval="5">             <spark xmlns="uri:oozie:spark-action:0.2">                     <job-tracker>${resourceManager}</job-tracker>                     <name-node>${nameNode}</name-node>                     <master>yarn</master>                     <mode>client</mode>                     <name>spark_job</name>                     <jar>spark_job.py</jar>                     <spark-opts>                             --master yarn                             --deploy-mode client                             --driver-memory 11288m                             --executor-memory 24GB                             --num-executors 8                             --conf spark.dynamicAllocation.enabled=true                             --conf spark.executor.cores=2                             --conf spark.shuffle.service.enabled=true                             --conf spark.yarn.driver.memoryOverhead=1024                             --conf spark.yarn.executor.memoryOverhead=1024                             --jars /usr/hdp/3.1.0.0-78/hive_warehouse_connector/hive-warehouse-connector-assembly-1.0.0.3.1.0.0-78.jar                             --conf spark.security.credentials.hiveserver2.enabled=false                             --py-files /usr/hdp/3.1.0.0-78/hive_warehouse_connector/pyspark_hwc-1.0.0.3.1.0.0-78.zip                     </spark-opts>                     <file>spark_job.py</file>                     </spark>             <ok to="end"/>             <error to="kill"/>     </action>     <kill name = "kill_job">         <message>Job failed</message>     </kill>     <end name = "end" /> </workflow-app> job.properties: nameNode=hdfs://namenodehost:8020 resourceManager=namenodehost:8050 queueName=${nameNode}/user/oozie/workflows/hadoop_main_workflow oozie.use.system.libpath=true oozie.wf.application.path=${nameNode}/user/oozie/workflows/hadoop_main_workflow oozie.action.sharelib.for.sqoop=sqoop oozie.action.sharelib.for.spark=spark2 Stack: HDP 3.1.0 oozie 4.3.1.3.1.0.0-78 ... 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