hadoop jconsole监控

	Installation
   Hadoop-cacti-jtg gathers data by accessing JMX information. JMX support is
   fairly easy to enable with hadoop.
   Hadoop
     conf/hadoop-metrics.properties
       Setup all metrics objects to use NullContextWithUpdateThread. The period
       must match the period of your polling. For example my monitoring station
       polls at 5 minute intervals. Thus I have set period to 300(seconds).
  
       dfs.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
       dfs.period=300
        
       jvm.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
       jvm.period=300
   HBase
      HBase provides detailed instructions for JMX:
      http://hadoop.apache.org/hbase/docs/current/metrics.html
      conf/hadoop-metrics.properties
        hbase.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
        hbase.period=300
        jvm.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
        jvm.period=300
        rpc.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
        rpc.period=300
   Enable JMX on Each Hadoop Node
        
        cd /conf
        vi jmxremote.access
        monitorRole   readonly
        controlRole   readwrite
        vi jmxremote.password
        monitorRole     
        controlRole     
        chmod 600 jmxremote.password
        chown $HADOOPUSER jxmremote.password
        vi hadoop.env
        ...
        export HADOOP_JMX_BASE="-Dcom.sun.management.jmxremote.ssl=false"
        export HADOOP_JMX_BASE="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.password.file=/opt/hadoop-0.19.1/conf/jmxremote.password"
        export HADOOP_JMX_BASE="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.access.file=/opt/hadoop-0.19.1/conf/jmxremote.access"
        # Command specific options appended to HADOOP_OPTS when specified
        export HADOOP_NAMENODE_OPTS="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.port=10001"
        export HADOOP_SECONDARYNAMENODE_OPTS="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.port=10002"
        export HADOOP_DATANODE_OPTS="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.port=10003"
        export HADOOP_BALANCER_OPTS="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.port=10004"
        export HADOOP_JOBTRACKER_OPTS="$HADOOP_JMX_BASE -Dcom.sun.management.jmxremote.port=10005"
        ...
        Restart Hadoop. If you have done this correctly you should notice your
        system is now listening on ports 10001-10005. At this point you should
        be able to use jconsole (found in your JDK bin) to connect to these ports
        to test.
  HBase
        The process above is similar for HBase. Each HBase component has its own
        variable like HBASE_REGIONSERVER_OPS inside hbase-env.sh. Change them
        and restart.
 
        Again look here:
        http://hadoop.apache.org/hbase/docs/current/metrics.html
        
    $HBASE_HOME/conf/hbase-env.sh
    Add the lines:
    JMX_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false"
    JMX_OPTS="$JMX_OPTS -Dcom.sun.management.jmxremote.password.file=$HBASE_HOME/conf/jmxremote.passwd"
    JMX_OPTS="$JMX_OPTS -Dcom.sun.management.jmxremote.access.file=$HBASE_HOME/conf/jmxremote.access"
    export HBASE_MASTER_OPTS="$JMX_OPTS -Dcom.sun.management.jmxremote.port=10101"
    export HBASE_REGIONSERVER_OPTS="$JMX_OPTS -Dcom.sun.management.jmxremote.port=10102"




以上配置好之后重启hadoop，就可以利用jconsole远程连接查看相关数据