ALM-43013 JDBCServer GC Time Exceeds the Threshold (For MRS 2.x or Earlier)

Description

The system checks the GC time of the JDBCServer process every 60 seconds. This alarm is generated when the detected GC time exceeds the threshold (12 seconds) for three consecutive times. You can change the threshold by choosing System > Threshold Configuration > Service > Spark > JDBCServer GC Time > Total JDBCServer GC Time. This alarm is cleared when the JDBCServer GC time is shorter than or equal to the threshold.

Attribute

Parameters

Impact on the System

If the GC time exceeds the threshold, JDBCServer may run in low performance.

Possible Causes

The heap memory of the JDBCServer process is overused or inappropriately allocated, causing frequent GC.

Procedure

1. Check the GC time.
   1. Go to the cluster details page and choose Alarms.
   2. Select the alarm whose Alarm ID is 43013 and view the IP address and role name of the instance in Location.
   3. Choose Components > Spark > Instance > JDBCServer (IP address of the instance for which the alarm is generated) > Customize > GC Time of the JDBCServer Process. Click OK to view the GC time.
   4. Check whether the GC time of the JDBCServer process is longer than 12 seconds.
      • If yes, go to 1.e.
      • If no, go to 2.
   5. Choose Components > Spark > Service Configuration. Set Type to All and choose JDBCServer > Tuning. Increase the value of the SPARK_DRIVER_MEMORY parameter as required.
   6. Check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 2.

2. Collect fault information.
   1. On MRS Manager, choose System > Export Log.
   2. Contact the O&M engineers and send the collected logs.

Reference

None