Hi Henry ,

Whenever you will create (DDS)'Decision-Data-Store' [Designer-Studio>Decisioning>Infrastructure>Services>Decision Data Store| |Add node]  your node will be added in the Cassandra cluster and there will be directory called Cassandra created in your application server root directory .

By default Cassandra logs placed inside PRPCTemp folder .

If you want to change the path of the Cassandra logs you can follow below steps

1)open the logback.xml file from  F:\Application Servers\apache-tomcat-PRPC73\cassandra\conf directory .

2)Change the file name pattern to the desired path in below appender .

      <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">

    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

      <fileNamePattern>${CASSANDRA_LOGDIR}/Cassandra-%d{yyyy-MMM-dd}.log.%i</fileNamePattern>

      <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

        <maxFileSize>2MB</maxFileSize>

      </timeBasedFileNamingAndTriggeringPolicy>

    </rollingPolicy>

    <encoder>

      <pattern>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n</pattern>

      <!-- old-style log format

      <pattern>%5level [%thread] %date{ISO8601} %F (line %L) %msg%n</pattern>

      -->

    </encoder>

  </appender>

 you can check the Cassandra logs location always  from (Designer Studio>System>Operations>Logs) .

Thanks,

Arun