Uses of Class org.apache.hadoop.hdfs.server.federation.router.PeriodicService (Apache Hadoop HDFS-RBF 3.5.0 API)
Description: use: package: org.apache.hadoop.hdfs.server.federation.router, class: PeriodicService

# Uses of Class
org.apache.hadoop.hdfs.server.federation.router.PeriodicService

Packages that use PeriodicService
Package
Description
org.apache.hadoop.hdfs.server.federation.router
The router package includes the core services for a HDFS federation router.
org.apache.hadoop.hdfs.server.federation.store
The federation state store tracks persistent values that are shared between multiple routers.

- ## Uses of PeriodicService in org.apache.hadoop.hdfs.server.federation.router

  Subclasses of PeriodicService in org.apache.hadoop.hdfs.server.federation.router
  Modifier and Type
  Class
  Description
  `class`
  `NamenodeHeartbeatService`
  The `Router` periodically checks the state of a Namenode (usually on the same server) and reports their high availability (HA) state and load/space status to the `StateStoreService` .
  `class`
  `RouterHeartbeatService`
  Service to periodically update the Router current state in the State Store.
  `class`
  `RouterQuotaUpdateService`
  Service to periodically update the `RouterQuotaUsage` cached information in the `Router`.
  `class`
  `RouterSafemodeService`
  Service to periodically check if the `StateStoreService` cached information in the `Router` is up to date.

- ## Uses of PeriodicService in org.apache.hadoop.hdfs.server.federation.store

  Subclasses of PeriodicService in org.apache.hadoop.hdfs.server.federation.store
  Modifier and Type
  Class
  Description
  `class`
  `StateStoreCacheUpdateService`
  Service to periodically update the `StateStoreService` cached information in the `Router`.
  `class`
  `StateStoreConnectionMonitorService`
  Service to periodically monitor the connection of the StateStore `StateStoreService` data store and to re-open the connection to the data store if required.