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From nifi-san <nairsande...@gmail.com>
Subject Re: Not able to start nifi nodes when clustered
Date Thu, 29 Jun 2017 07:47:13 GMT
I was able to get over this.There was a typo and I can now start the two
clustered Nifi nodes.

However, I keep on getting the below messages on both the nodes when I try
to start them.

2017-06-29 13:03:58,537 WARN [main] o.a.nifi.controller.StandardFlowService
There is currently no Cluster Coordinator. This often happens upon restart
of NiFi when running an embedded ZooKeeper. Will register this node to
become the active Cluster Coordinator and will attempt to connect to cluster
again
2017-06-29 13:03:58,538 INFO [main] o.a.n.c.l.e.CuratorLeaderElectionManager
CuratorLeaderElectionManager[stopped=false] Attempted to register Leader
Election for role 'Cluster Coordinator' but this role is already registered
2017-06-29 13:04:20,867 WARN [main] o.a.nifi.controller.StandardFlowService
There is currently no Cluster Coordinator. This often happens upon restart
of NiFi when running an embedded ZooKeeper. Will register this node to
become the active Cluster Coordinator and will attempt to connect to cluster
again
2017-06-29 13:04:20,867 INFO [main] o.a.n.c.l.e.CuratorLeaderElectionManager
CuratorLeaderElectionManager[stopped=false] Attempted to register Leader
Election for role 'Cluster Coordinator' but this role is already registered
2017-06-29 13:04:28,871 INFO [Curator-Framework-0]
o.a.c.f.state.ConnectionStateManager State change: SUSPENDED
2017-06-29 13:04:28,872 INFO [Curator-ConnectionStateManager-0]
o.a.n.c.l.e.CuratorLeaderElectionManager
org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener@25c5f7c5
Connection State changed to SUSPENDED
2017-06-29 13:04:28,878 ERROR [Curator-Framework-0]
o.a.c.f.imps.CuratorFrameworkImpl Background operation retry gave up
org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss
        at
org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
        at
org.apache.curator.framework.imps.CuratorFrameworkImpl.checkBackgroundRetry(CuratorFrameworkImpl.java:728)
        at
org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:857)
        at
org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:809)
        at
org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:64)
        at
org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:267)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:748)


The above error comes in both the nodes.

I tried to modify the java security file to /dev/urandom on both the nodes
in the cluster but it did not help.
Also modified the properties belwo in nifi.properties on both nodes:-

nifi.cluster.flow.election.max.wait.time=5 mins
nifi.cluster.flow.election.max.candidates=2

Still it does not work.

The only ports established are :-

root@hostname-1:/opt/nifi/nifi-1.3.0/conf# ^C
root@hostname-1:/opt/nifi/nifi-1.3.0/conf# netstat -an |grep 8080
tcp        0      0 127.0.1.1:8080          0.0.0.0:*               LISTEN
root@hostname-1:/opt/nifi/nifi-1.3.0/conf# netstat -an |grep 9999
tcp        0      0 0.0.0.0:9999            0.0.0.0:*               LISTEN
root@hostname-1:/opt/nifi/nifi-1.3.0/conf# netstat -an |grep 9998 --not
running
root@hostname-1:/opt/nifi/nifi-1.3.0/conf# netstat -an |grep 2888  -- not
running
root@hostname-1:/opt/nifi/nifi-1.3.0/conf# netstat -an |grep 3888 
tcp        0      0 127.0.1.1:3888          0.0.0.0:*               LISTEN\

Tried to ping the hostnames from each of the two nodes and they look to be
fine.
Firewall has been disabled.

Any pointers ?










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