[jira] [Created] (FLINK-21980) ZooKeeperRunningJobsRegistry creates an empty znode

[Shang Yuanchun (Jira)]

Ricky Burnett created FLINK-21980:
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             Summary: ZooKeeperRunningJobsRegistry creates an empty znode
                 Key: FLINK-21980
                 URL: https://issues.apache.org/jira/browse/FLINK-21980
             Project: Flink
          Issue Type: Bug
          Components: Client / Job Submission
    Affects Versions: 1.12.2
            Reporter: Ricky Burnett


ZooKeeperRunningJobsRegistry#writeEnumToZooKeeper calls
{code:java}
this.client.newNamespaceAwareEnsurePath(zkPath).ensure(client.getZookeeperClient());{code}
This creates an empty znode in zookeeper.  If the job manager is interrupted at this point the job manager cannot recover.  When trying to restore jobs on a restarted job manager, ZooKeeperRunningJobsRegistry#getJobSchedulingStatus will throw an exception due to the empty znode. 

Behavior was verified in a test environment where the job manager was interrupted at that point in execution leaving ZK in the following state:
{code:java}
zk: localhost:2181(CONNECTED) 2] ls /flink/default
[checkpoint-counter, checkpoints, jobgraphs, leader, leaderlatch, running_job_registry]
[zk: localhost:2181(CONNECTED) 3] ls /flink/default/running_job_registry
[c982053dd0b9100967e6a9d89202f2a5]
[zk: localhost:2181(CONNECTED) 4] get /flink/default/running_job_registry/c982053dd0b9100967e6a9d89202f2a5

[zk: localhost:2181(CONNECTED) 5]
{code}



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