[jira] [Created] (FLINK-22516) ResourceManager cannot establish leadership

["Ricky Burnett (Jira)" <ji...@apache.org>]

Ricky Burnett created FLINK-22516:
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             Summary: ResourceManager cannot establish leadership
                 Key: FLINK-22516
                 URL: https://issues.apache.org/jira/browse/FLINK-22516
             Project: Flink
          Issue Type: Bug
            Reporter: Ricky Burnett
         Attachments: jobmanager_leadership.log

We are running Flink clusters with 2 Jobmanagers in HA mode.  After a Zookeeper restart the two JMs begin leadership election end up in state where they are both trying to start their ResourceManager and until one of them writes to `leader/<jobid>/resource_manager_lock` and the JobMaster proceeds to execute `notifyOfNewResourceManagerLeader` which restarts the ResourceManager.  This in turn writes to `leader/<jobid>/resource_manager_lock` which triggers the other JobMaster to restart it's ResourceManager.  We can see this in the logs from the "ResourceManager leader changed to new address" log, that goes back and forth between the two JMs and the two IP addresses.  This cycle appears to continue indefinitely with outside interruption.  

I've attached combined logs from two JMs in our environment that got into this state.  The logs start with the loss of connection and end with a couple of cycles of back and forth.   The two relevant hosts are "flink-jm-828d4aa2-d4d4-457b-995d-feb56d08c1fb-784cdb9c57-tsxb7" and "flink-jm-828d4aa2-d4d4-457b-995d-feb56d08c1fb-784cdb9c57-mpf9x".

*-tsxb7 appears to be the last host that was granted leadership. 
{code:java}
{"thread":"Curator-Framework-0-EventThread","level":"INFO","loggerName":"org.apache.flink.runtime.jobmaster.JobManagerRunner","message":"JobManager runner for job tenant: ssademo, pipeline: 828d4aa2-d4d4-457b-995d-feb56d08c1fb, name: integration-test-detection (33e12948df69077ab3b33316eacbb5e4) was granted leadership with session id 97992805-9c60-40ba-8260-aaf036694cde at akka.tcp://flink@100.97.92.73:6123/user/jobmanager_3.","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","instant":{"epochSecond":1617129712,"nanoOfSecond":447000000},"contextMap":{},"threadId":152,"threadPriority":5,"source":{"class":"org.apache.flink.runtime.jobmaster.JobManagerRunner","method":"startJobMaster","file":"JobManagerRunner.java","line":313},"service":"streams","time":"2021-03-30T18:41:52.447UTC","hostname":"flink-jm-828d4aa2-d4d4-457b-995d-feb56d08c1fb-784cdb9c57-tsxb7"}
{code}
But  *-mpf9x continues to try to wrestle control back.



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