Help Center/ MapReduce Service/ Component Operation Guide (Paris Region)/ Using Storm/ Storm Common Parameters
Updated on 2022-12-14 GMT+08:00
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Storm Common Parameters

This section applies to MRS 3.x or later.

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For details about how to set parameters, see Modifying Cluster Service Configuration Parameters.

Parameter Description

Table 1 Parameter description

Parameter

Description

Default Value

supervisor.slots.ports

Specifies the list of ports that can run workers on the supervisor. Each worker occupies a port, and each port runs only one worker. This parameter is used to set the number of workers that can run on each server. Ports range from 1024 to 65535, and ports are separated by commas (,).

6700,6701,6702,6703

WORKER_GC_OPTS

Specifies the JVM option used for supervisor to start worker. It is recommended that you set this parameter based on memory usage of a service. For simple service processing, the recommended value is -Xmx1G. If window cache is used, the value of this parameter is calculated based on the following formula: Size of each record x Period x 2

-Xms1G -Xmx1G -XX:+UseG1GC -XX:+PrintGCDetails -Xloggc:artifacts/gc.log -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=1M -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=artifacts/heapdump

default.schedule.mode

Specifies the default scheduling mode of the scheduler. Options are as follows:

  • AVERAGE: indicates that the scheduling mechanism that uses the number of idle slots as the priority is used.
  • RATE: indicates that the scheduling mechanism that uses the rate of idle slots as the priority is used.

AVERAGE

nimbus.thrift.threads

Set the maximum number of connection threads when the active Nimbus externally provides services. If the Storm cluster is large and the number of Supervisor instances is large, increase connection threads.

512
Parent topic: Using Storm