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I've place cassandra software in /home/user
All Log files should be placed in /data/log.
Cassandra has the file conf/logback.xml which includes parameters for determining of file log paths.
For instance:
${cassandra.logdir}/system.log
What is the bay way to set or change only cassandra.logdir somewhere?
The typical way is to set it as a system property using
-Dcassandra.logdir=/data/log. A number of cassandra properties are set in this manner, typically in cassandra-env.sh - you'll see they're configured by appending to the JVM_OPTS variable: