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Configuration Description

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Help Center/ MapReduce Service/ Component Operation Guide (LTS)/ Using Flink/ Flink Configuration Management/ HA

HA

Updated on 2022-11-18 GMT+08:00

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Scenarios

The Flink HA mode depends on ZooKeeper. Therefore, ZooKeeper-related configuration items must be set.

Configuration Description

Configuration items include the ZooKeeper address, path, and security certificate.

**Table 1** Parameters
Parameter	Description	Default Value	Mandatory
high-availability	Whether HA is enabled. Only the following two modes are supported currently: none: Only a single JobManager is running. The checkpoint is disabled for JobManager. ZooKeeper: In non-Yarn mode, multiple JobManagers are supported and the leader JobManager is elected. In Yarn mode, only one JobManager exists.	zookeeper	No
high-availability.zookeeper.quorum	ZooKeeper quorum address.	Automatic configuration	No
high-availability.zookeeper.path.root	Root directory that Flink creates on ZooKeeper, storing metadata required in HA mode.	/flink	No
high-availability.storageDir	Directory for storing JobManager metadata of state backend. ZooKeeper stores only pointers to actual data.	hdfs:///flink/recovery	No
high-availability.zookeeper.client.session-timeout	Session timeout duration on the ZooKeeper client. The unit is millisecond.	60000	No
high-availability.zookeeper.client.connection-timeout	Connection timeout duration on the ZooKeeper client. The unit is millisecond.	15000	No
high-availability.zookeeper.client.retry-wait	Retry waiting time on the ZooKeeper client. The unit is millisecond.	5000	No
high-availability.zookeeper.client.max-retry-attempts	Maximum retry times on the ZooKeeper client.	3	No
high-availability.job.delay	Delay of job restart when JobManager recovers.	The default value is the same as the value of akka.ask.timeout.	No
high-availability.zookeeper.client.acl	ACL (open creator) of the ZooKeeper node.	This parameter is configured automatically according to the cluster installation mode. Security mode: The default value is creator. Non-security mode: The default value is open.	Yes
zookeeper.sasl.disable	Simple authentication and security layer (SASL)-based certificate enable switch.	This parameter is configured automatically according to the cluster installation mode. Security mode: The default value is false. Non-security mode: The default value is true.	Yes
zookeeper.sasl.service-name	If the ZooKeeper server configures a service whose name is different from ZooKeeper, this configuration item can be set. If service names on the client and server are inconsistent, authentication fails.	zookeeper	Yes

Parent topic: Flink Configuration Management

Previous topic: Kerberos-based Security

Next topic: Environment

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