<configuration scan="true">

  <jmxConfigurator />

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

    <file>${cassandra.logdir}/system.log</file>

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

      <fileNamePattern>${cassandra.logdir}/system.log.%i.zip</fileNamePattern>

      <minIndex>1</minIndex>

      <maxIndex>20</maxIndex>

    </rollingPolicy>

    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">

      <maxFileSize>20MB</maxFileSize>

    </triggeringPolicy>

    <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>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">

    <encoder>

      <pattern>%-5level %date{HH:mm:ss,SSS} %msg%n</pattern>

    </encoder>

  </appender>

  <root level="INFO">

    <appender-ref ref="FILE" />

    <appender-ref ref="STDOUT" />

  </root>

  <logger name="com.thinkaurelius.thrift" level="ERROR"/>

</configuration>

$ nodetool setlogginglevel org.apache.cassandra.db DEBUG

rs.remove("1.1.1.1:27017")

rs.add("1.1.1.2:27017")

cfg = rs.conf()

cfg.members = [cfg.members[0]]

rs.reconfig(cfg, {force : true})

{ "ok" : 1 }

scala>   val a = List(1,2,3)

a: List[Int] = List(1, 2, 3)

scala>   val b = List(0.1, 0.2, 0.3)

b: List[Double] = List(0.1, 0.2, 0.3)

scala>   val c = a :: b

c: List[Any] = List(List(1, 2, 3), 0.1, 0.2, 0.3)

scala>   val c = a ::: b

c: List[AnyVal] = List(1, 2, 3, 0.1, 0.2, 0.3)

scala> List.concat(a, b)

res0: List[AnyVal] = List(1, 2, 3, 0.1, 0.2, 0.3)

scala> a ++ b

res2: List[AnyVal] = List(1, 2, 3, 0.1, 0.2, 0.3)

scala> List(a, b)

res3: List[List[AnyVal]] = List(List(1, 2, 3), List(0.1, 0.2, 0.3))

scala> a zip b

res4: List[(Int, Double)] = List((1,0.1), (2,0.2), (3,0.3))