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https://issues.apache.org/jira/browse/FLINK-18733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165787#comment-17165787
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Leonid Ilyevsky commented on FLINK-18733:
-----------------------------------------
[~trohrmann] please see two logs from that run, and also modified config file
that I used.
Actually both jobmanager and taskmanager had this error.
Before submitting this report, I did some little research, looking at Flink
code. To me it seems like it is related to SASL; it tries to do something with
Zookeeper cluster host addresses as if it has security enabled. In my case I
don't have any security on Zookeeper, so your Zookeeper client should not even
go there.
I tried to explicitly disable it by setting 'zookeeper.sasl.disable' to 'true',
but it did not help.
I believe you can easily reproduce this issue; it is not even important whether
you have Zookeeper cluster running, because the client didn't even get to the
point of actual connection.
Please see if there is any workaround.
> Jobmanager cannot start in HA mode with Zookeeper
> -------------------------------------------------
>
> Key: FLINK-18733
> URL: https://issues.apache.org/jira/browse/FLINK-18733
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.11.1
> Reporter: Leonid Ilyevsky
> Priority: Major
> Attachments: flink-conf.yaml,
> flink-liquidnt-standalonesession-0-nj1dvloglab01.liquidnet.biz.log,
> flink-liquidnt-taskexecutor-0-nj1dvloglab01.liquidnet.biz.log
>
>
> When configured in HA mode, the Jobmanager cannot start at all. First, it
> issues warnings like this:
> {quote}{{2020-07-27 08:58:23,197 WARN
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.ClientCnxn [] -
> Session 0x0 for server *nj1dvloglab01.liquidnet.biz/<unresolved>:2181*,
> unexpected error, closing socket connection and attempting reconnect}}
> {{java.lang.IllegalArgumentException: *Unable to canonicalize address*
> nj1dvloglab01.liquidnet.biz/<unresolved>:2181 because it's not resolvable}}
> {{ at
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.SaslServerPrincipal.getServerPrincipal(SaslServerPrincipal.java:65)
> ~[flink-shaded-zookeeper-3.4.14.jar:3.4.14-11.0]}}
> {{ at
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.SaslServerPrincipal.getServerPrincipal(SaslServerPrincipal.java:41)
> ~[flink-shaded-zookeeper-3.4.14.jar:3.4.14-11.0]}}
> {{ at
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1001)
> ~[flink-shaded-zookeeper-3.4.14.jar:3.4.14-11.0]}}
> {{ at
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1060)
> [flink-shaded-zookeeper-3.4.14.jar:3.4.14-11.0]}}
> {quote}
> After few attempts connecting to Zookeeper, it finally fails:
> {quote}2020-07-27 08:59:35,055 ERROR
> org.apache.flink.runtime.entrypoint.ClusterEntrypoint [] - Fatal error
> occurred in the cluster entrypoint.
> org.apache.flink.util.FlinkException: Unhandled error in
> ZooKeeperLeaderElectionService: Ensure path threw exception
> at
> org.apache.flink.runtime.leaderelection.ZooKeeperLeaderElectionService.unhandledError(ZooKeeperLeaderElectionService.java:430)
> ~[flink-dist_2.12-1.11.1.jar:1.11.1]
> {quote}
>
> The same HA configuration works fine for me in Flink 1.10.0.
>
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