问题
I am unable to start the solr aspect of DSE search and i get the following exception message when i execute, when i execute bin/dse cassandra start the cassandra service is started but not solr, does anyone have any guidance to offer me i know i have missed something:
bin/dse cassandra -s
message:
Cannot start node if snitch's data center (Solr) differs from previous data center (Cassandra). Please fix the snitch configuration, decommission and rebootstrap this node or use the flag -Dcassandra.ignore_dc=true.
at org.apache.cassandra.db.SystemKeyspace.checkHealth(SystemKeyspace.java:629) ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:290) [cassandra-all-2.1.12.1046.jar:2.1.12.1046]
at com.datastax.bdp.server.DseDaemon.setup(DseDaemon.java:329) [dse-4.7.7.jar:4.7.7]
at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:564) [cassandra-all-2.1.12.1046.jar:2.1.12.1046]
at com.datastax.bdp.DseModule.main(DseModule.java:75) [dse-4.7.7.jar:4.7.7]
回答1:
Recent versions of DataStax Enterprise do not allow you to change the workload of an existing node with existing data. In order to start this node, either remove all data in the data folder (effectively, start clean) or use the -Dcassandra.ignore_dc=true flag (as it says in the error).
回答2:
Clearing the data as a service
Remove all data from a package installation.
Procedure
To clear the data from the default directories:
After stopping the service, run the following command:
$ sudo rm -rf /var/lib/cassandra/*
来源：https://stackoverflow.com/questions/35727475/unable-to-start-solr-aspect-of-dse-search