Zookeeper fails at launch - strimzi20

[pashafirdous]

Hi ,

when we launch Kafka-strimzi20, we observe an error as below.

the issue is observed randomly does self heal.

could you please advice why does the leader election fail at the first place.

2021-02-12 13:49:35,370 WARN Failed to resolve address: my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc (org.apache.zookeeper.server.quorum.QuorumPeer) [my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888]
java.net.UnknownHostException: my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc
        at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797)
        at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1505)
        at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1364)
        at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1298)
        at java.base/java.net.InetAddress.getByName(InetAddress.java:1248)
        at org.apache.zookeeper.server.quorum.QuorumPeer$QuorumServer.recreateSocketAddresses(QuorumPeer.java:197)
        at org.apache.zookeeper.server.quorum.QuorumPeer.recreateSocketAddresses(QuorumPeer.java:756)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager$Listener.run(QuorumCnxManager.java:926)
2021-02-12 13:49:35,370 INFO 2 is accepting connections now, my election bind port: my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888 (org.apache.zookeeper.server.quorum.QuorumCnxManager) [my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888]
2021-02-12 13:49:35,370 ERROR Exception while listening (org.apache.zookeeper.server.quorum.QuorumCnxManager) [my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888]
java.net.SocketException: Unresolved address
        at java.base/java.net.ServerSocket.bind(ServerSocket.java:388)
        at java.base/java.net.ServerSocket.bind(ServerSocket.java:349)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager$Listener.run(QuorumCnxManager.java:931)
2021-02-12 13:49:36,370 INFO Leaving listener (org.apache.zookeeper.server.quorum.QuorumCnxManager) [my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888]
2021-02-12 13:49:36,371 ERROR As I'm leaving the listener thread after 3 errors. I won't be able to participate in leader election any longer: my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888. Use zookeeper.electionPortBindRetry property to increase retry count. (org.apache.zookeeper.server.quorum.QuorumCnxManager) [my-cluster-zookeeper-1.my-cluster-zookeeper-nodes.strimzi20.svc:3888]

[scholzj]

UnknownHostException normally suggests issues with your DNS. The self-healing would probably correspond with that as well.