What is the correct way of changing a partitioner?

Mon, 18 Oct 2010 22:09:36 -0700 

Hi,
I deleted all the data (programmatically). Then I changed the partitioner
from RandomPartitioner to OrderPreservingPartitioner and when I started
Cassandra - I get the following error. What is the correct way of changing
the partitioner and how can I get past this error?

ERROR 17:28:28,985 Fatal exception during initialization
java.io.IOException: Found system table files, but they couldn't be loaded.
Did you change the partitioner?
        at
org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:154)
        at
org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:94)
        at
org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:211)

Thanks!

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