CODEWITHSUNDEEP
cassandra
Mr'Black
Mr'Black

Reputation: 284

Is it possible to change the snitch from Property back to simplesnitch?

Going from SimpleSnitch to PropertyFileSnitch or Gossiping i succeded but the reversed process not.

Ended in this point :

Cannot start node if snitch's data center (datacenter1) differs from previous data center (DC3). Please fix the snitch configuration, decommission and rebootstrap this node or use the flag -Dcassandra.ignore_dc=true.

Tryed to insert into cassandra-env.sh the -Dcassandra.ignore_dc=true also the -Dcassandra.ignore_rack=true Even changed in a desperate attempt the cassandra-topology.properties to look like ip=datacenter1:rack1

All futile.

Is it possible to go back from PropertyFileSnitch to SimpleSnitch (data inserted via property and network topology ) or am i hunting ghosts?

Thanks in advance.

Upvotes: 2

Views: 4710

Answers (1)

Chris Lohfink
Chris Lohfink

Reputation: 16400

cassandra.ignore_dc=true would work:

https://github.com/apache/cassandra/blob/e6168672bc421f0d0f90dd45bf3a991be578b3dc/src/java/org/apache/cassandra/service/StartupChecks.java#L317

Make sure in your cassandra-env.sh you set it in the jvm opts. In the last line of the file set:

JVM_OPTS="$JVM_OPTS -Dcassandra.ignore_dc=true"

Can check its set via cat /proc/<cassanda pid>/cmdline. If using deb should be able to do something like 

cat /proc/`cat /var/run/cassandra.pid`/cmdline

or sudo service cassandra status

Upvotes: 6

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