Comment 1 for bug 1673737

status of the controller where kafka is down:

● kafka.service - Apache Kafka server (broker)
   Loaded: loaded (/lib/systemd/system/kafka.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2017-03-17 10:40:11 UTC; 2min 55s ago
     Docs: http://kafka.apache.org/documentation.html
  Process: 8425 ExecStart=/opt/kafka/bin/kafka-server-start.sh /opt/kafka/config/server.properties (code=exited, status=1/FAILURE)
 Main PID: 8425 (code=exited, status=1/FAILURE)

trace from kafka/server.log:

[2017-03-17 10:40:11,574] FATAL Fatal error during KafkaServerStartable startup. Prepare to shutdown (kafka.server.KafkaServerStartable)
org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 6000
        at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:1232)
        at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:156)
        at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:130)
        at kafka.utils.ZkUtils$.createZkClientAndConnection(ZkUtils.scala:75)
        at kafka.utils.ZkUtils$.apply(ZkUtils.scala:57)
        at kafka.server.KafkaServer.initZk(KafkaServer.scala:294)
        at kafka.server.KafkaServer.startup(KafkaServer.scala:180)
        at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:37)
        at kafka.Kafka$.main(Kafka.scala:67)
        at kafka.Kafka.main(Kafka.scala)
[2017-03-17 10:40:11,576] INFO shutting down (kafka.server.KafkaServer)