ERROR [main] 2019-04-03 15:34:23,376 CassandraDaemon.java:706 - Exception encountered during startup

ERROR [main] 2019-04-03 15:34:23,376 CassandraDaemon.java:706 - Exception encountered during startup

Error Message:

ERROR [main] 2019-04-03 15:34:23,376 CassandraDaemon.java:706 - Exception encountered during startup
java.lang.RuntimeException: A node with address /10.142.0.7 already exists, cancelling join. Use cassandra.replace_address if you want to replace this node.
        at org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:557) ~[apache-cassandra-3.11.0.jar:3.11.0]
        at org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:801) ~[apache-cassandra-3.11.0.jar:3.11.0]
        at org.apache.cassandra.service.StorageService.initServer(StorageService.java:666) ~[apache-cassandra-3.11.0.jar:3.11.0]
        at org.apache.cassandra.service.StorageService.initServer(StorageService.java:612) ~[apache-cassandra-3.11.0.jar:3.11.0]
        at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:393) [apache-cassandra-3.11.0.jar:3.11.0]
        at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:600) [apache-cassandra-3.11.0.jar:3.11.0]
        at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:689) [apache-cassandra-3.11.0.jar:3.11.0]
INFO  [StorageServiceShutdownHook] 2019-04-03 15:34:23,417 HintsService.java:220 - Paused hints dispatch
WARN  [StorageServiceShutdownHook] 2019-04-03 15:34:23,419 Gossiper.java:1538 - No local state, state is in silent shutdown, or node hasn't joined, not announcing shutdown
INFO  [StorageServiceShutdownHook] 2019-04-03 15:34:23,421 MessagingService.java:984 - Waiting for messaging service to quiesce
INFO  [ACCEPT-/10.142.0.7] 2019-04-03 15:34:23,422 MessagingService.java:1338 - MessagingService has terminated the accept() thread

INFO  [StorageServiceShutdownHook] 2019-04-03 15:34:23,810 HintsService.java:220 - Paused hints dispatch


Solution:
Remove Node from cluster by using nodetool removenode, then Start the Cassandra on that particular node.

Step-1 :Check the status of node by using below command
root@node1:~/cassandra/apache-cassandra-3.11.0/bin# ./nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address     Load       Tokens       Owns    Host ID                               Rack
DN  10.142.0.9  75.02 KiB  256          ?       901bc4ca-0936-4c4a-9c76-9dfda2b0906c  rack1
UN  10.142.0.6  205.25 KiB  256          ?       967507db-2a28-4657-81ad-c0b965479466  rack1
DN  10.142.0.7  240.03 KiB  256          ?       fd2066b5-6ed3-4724-bdd5-c243c8748aa4  rack1

Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless

Step-2 :Remove the down node by using nodetool remove command
root@node1:~/cassandra/apache-cassandra-3.11.0/bin# ./nodetool removenode fd2066b5-6ed3-4724-bdd5-c243c8748aa4

root@node1:~/cassandra/apache-cassandra-3.11.0/bin#
root@node1:~/cassandra/apache-cassandra-3.11.0/bin# ./nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address     Load       Tokens       Owns    Host ID                               Rack
DN  10.142.0.9  75.02 KiB  256          ?       901bc4ca-0936-4c4a-9c76-9dfda2b0906c  rack1
UN  10.142.0.6  191.2 KiB  256          ?       967507db-2a28-4657-81ad-c0b965479466  rack1

Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless

root@node1:~/cassandra/apache-cassandra-3.11.0/bin#

Step-3 : Start the Cassandra process on particular node.

root@node1:~/cassandra/apache-cassandra-3.11.0/bin# start cassandra