Help Center > > User Guide> MRS Manager Operation Guide> Alarm Reference> ALM-43012 Direct Memory Usage of the JDBCServer Process Exceeds the Threshold

ALM-43012 Direct Memory Usage of the JDBCServer Process Exceeds the Threshold

Updated at: Dec 31, 2019 GMT+08:00

Description

The system checks the direct memory usage of the JDBCServer process every 30 seconds. The alarm is generated when the direct memory usage of the JDBCServer process exceeds the threshold (90% of the maximum memory).

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

43012

Major

Yes

Parameters

Parameter

Description

ServiceName

Specifies the service for which the alarm is generated.

RoleName

Specifies the role for which the alarm is generated.

HostName

Specifies the host for which the alarm is generated.

Impact on the System

Overhigh direct memory usage of the JDBCServer process deteriorates JDBCServer running performance or even causes OOM, which results in unavailable JDBCServer process.

Possible Causes

The direct memory of the JDBCServer process is overused or inappropriately allocated.

Procedure

  1. Check direct memory usage.

    1. On MRS Manager, click Alarms and select the alarm whose Alarm ID is 43012. Then check the IP address and role name of the instance in Location.
    2. On MRS Manager, choose Services > Spark > Instance and click the JDBCServer for which the alarm is generated to enter the Instance Status page. Then choose Customize > Direct Memory of JDBCServer and click OK.
    3. Check whether the used direct memory of the JDBCServer process reaches 90% of the maximum direct memory specified for JDBCServer.
      • If yes, go to 1.d
      • If no, go to 2.
    4. On MRS Manager, choose Services > Spark > Service Configuration, and set Type to All. Choose JDBCServer > Tuning. Increase the value of -XX:MaxDirectMemorySize in spark.driver.extraJavaOptions as required.
    5. 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. Select Spark from the Service drop-down list and click OK.
    3. Set Start Time for log collection to 10 minutes ahead of the alarm generation time and End Time to 10 minutes behind the alarm generation time, and click Download.
    4. Contact the O&M personnel and send the collected log information.

Related Information

N/A

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