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Re: Leader Retrieval Timeout with HA Job Manager


Hi Jason,

sorry for the late response. The logs look indeed strange because both JMs are granted leadership without the other getting its leadership revoked. What would be interesting is to take a look at the Znode under `/flink/flink-ha/leader/00000000000000000000000000000000/job_manager_lock` in your ZooKeeper cluster. You should be able to take a look at the Znodes with `bin/zkCli.sh -server <SERVER_ADDRESS>`. One of the TMs retrieves the leader address and the other is not notified about the leader change. It is as if the ZooKeeper cluster does not notify Flink about the changes.

Cheers,
Till

On Tue, May 15, 2018 at 5:33 PM, Jason Kania <jason.kania@xxxxxxxxx> wrote:
Thanks for your help. The job manager launch on two nodes of the cluster is provided as well as the logs for the task managers, one that worked and one that could not seem to find the find an address which I am assuming is for the job manager. The logs are from nodes aaa-1 and aaa-2.

Thanks,

Jason

On Tuesday, May 15, 2018, 9:59:58 a.m. EDT, Timo Walther <twalthr@xxxxxxxxxx> wrote:


Can you change the log level to DEBUG and share the logs with us? Maybe Till (in CC) has some idea?

Regards,
Timo


Am 15.05.18 um 15:18 schrieb Jason Kania:
Hi Timo,

Thanks for the response.

Yes, we are running with a cloud provider, a cloud system provided by our national government for R&D purposes. The thing is that we also have Kafka and Cassandra on the same nodes and they have no issues in this environment, it is just Flink in an HA configuration that has problems so it is strange.

Is there any additional logging available for analysis of these sorts of scenarios? The details in the current logs are insufficient to know what is happening.

Thanks,

Jason

On Tuesday, May 15, 2018, 7:51:40 a.m. EDT, Timo Walther <twalthr@xxxxxxxxxx> wrote:


Hi Jason,

this sounds more like a network connection/firewall issue to me. Can you tell us a bit more about your environment? Are you running your Flink cluster on a cloud provider?

Regards,
Timo


Am 15.05.18 um 05:15 schrieb Jason Kania:
Hi,

I am using the 1.4.2 release on ubuntu and attempting to make use of an HA Job Manager, but unfortunately using HA functionality prevents job submission with the following error:

java.lang.RuntimeException: Failed to retrieve JobManager address
        at org.apache.flink.client.program.ClusterClient.getJobManagerAddress(ClusterClient.java:308)
        at org.apache.flink.client.program.StandaloneClusterClient.getClusterIdentifier(StandaloneClusterClient.java:86)
        at org.apache.flink.client.CliFrontend.createClient(CliFrontend.java:921)
        at org.apache.flink.client.CliFrontend.run(CliFrontend.java:264)
        at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1054)
        at org.apache.flink.client.CliFrontend$1.call(CliFrontend.java:1101)
        at org.apache.flink.client.CliFrontend$1.call(CliFrontend.java:1098)
        at org.apache.flink.runtime.security.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30)
        at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1098)
Caused by: org.apache.flink.runtime.leaderretrieval.LeaderRetrievalException: Could not retrieve the leader address and leader session ID.
        at org.apache.flink.runtime.util.LeaderRetrievalUtils.retrieveLeaderConnectionInfo(LeaderRetrievalUtils.java:113)
        at org.apache.flink.client.program.ClusterClient.getJobManagerAddress(ClusterClient.java:302)
        ... 8 more
Caused by: java.util.concurrent.TimeoutException: Futures timed out after [60000 milliseconds]
        at scala.concurrent.impl.Promise$DefaultPromise.ready(Promise.scala:223)
        at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:227)
        at scala.concurrent.Await$$anonfun$result$1.apply(package.scala:190)
        at scala.concurrent.BlockContext$DefaultBlockContext$.blockOn(BlockContext.scala:53)
        at scala.concurrent.Await$.result(package.scala:190)
        at scala.concurrent.Await.result(package.scala)
        at org.apache.flink.runtime.util.LeaderRetrievalUtils.retrieveLeaderConnectionInfo(LeaderRetrievalUtils.java:111)
        ... 9 more

This seems to also be tied to problems in having the TaskManager register. I have to repeatedly restart the TaskManager until it finally connects to the Job Manager. Most times it doesn't connect and doesn't complain making the determination of the root cause more difficult. The cluster is not busy and I have tried both with IP addresses and host names to determine if name resolution issues were the cause, but both situations are the same.

I have also noticed that if 2 job managers are launched on different nodes in the same cluster, they both come back with logging indicating that they are the leader so they are not talking to each other effectively and the logging is not even indicating that they are even attempting to talk with one another.

Lastly, the error "Could not retrieve the leader address and leader session ID." is a very poor error because it does not tell where it is attempting to get the information from.

Any suggestions would be appreciated.

Thanks,

Jason