[GitHub] [incubator-iotdb] jixuan1989 opened a new pull request #239: [Jenkins-master-128]fix bugs in performacne stats module; add new functions in its MBean

[GitBox]

jixuan1989 opened a new pull request #239: [Jenkins-master-128]fix bugs in 
performacne stats module; add new functions in its MBean
URL: https://github.com/apache/incubator-iotdb/pull/239
 
 
   Now MeasurementMBean has the following functions:
   ```java
   /**
      * start calculating the statistic.
      */
     void startStatistics();
   
     /**
      * start display performance statistic every interval of 
displayIntervalInMs.
      */
     void startContinuousPrintStatistics();
   
     /**
      * start display performance statistic after interval of 
displayIntervalInMs.
      */
     void startPrintStatisticsOnce();
   
     /**
      * stop display performance statistic.
      */
     void stopPrintStatistic();
   
     /**
      * clear current stat result, reset statistical state.
      */
     void clearStatisticalState();
   ```

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