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https://issues.apache.org/jira/browse/FLINK-18733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166429#comment-17166429
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Till Rohrmann commented on FLINK-18733:
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Hi [~lilyevsky], I tried Flink's ZooKeeper support locally. At first it worked
w/o problems. However, once I've configured the system with an unresolvable
{{high-availability.zookeeper.quorum}} address, I could reproduce what you are
describing. Hence, could you verify that the node on which you start the Flink
processes can actually resolve any of
{{nj1dvloglab01.liquidnet.biz:2181,nj1dvloglab02.liquidnet.biz:2181,nj1dvloglab03.liquidnet.biz:2181}}?
If the system cannot resolve the address name, then the ZooKeeper client is
not able to connect to the ZooKeeper quorum.
> 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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