hadoop官方文档学习笔记(1)——resourcemanagerHA

resource manager HA是hadoop自从2.4之后推出的功能,以Active/Standby的方式提供冗余,目的是为了消除单点失败的风险。

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1、总体架构:

hadoop官方文档学习笔记(1)——resource manager HA

2、故障切换:有自动和手动两种形式。

手动:如果以手动形式切换,使用yarn haadmin命令首先将Active节点转为standby,再将standby节点转为active。

自动:RM有基于zookeeper的节点选举机制决定哪一个是活动节点。不需要像HDFS一样部署一个zkfc守护进程,因为RM内嵌了这样的功能。

做了rm的HA之后,所有节点和客户端都要列出所有RM节点,连接时会用轮询的方式遍历,直到找到一个active的节点。如果活动节点down了,它们会继续轮询。这一动作被实现为org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider类。可以通过重新实现该类,并在yarn.client.failover-proxy-provider 配置项中指定新的类名来改写这一行为逻辑。


3、配置

Configuration PropertiesDescription
yarn.resourcemanager.zk-addressAddress of the ZK-quorum. Used both for the state-store and embedded leader-election.
yarn.resourcemanager.ha.enabledEnable RM HA.
yarn.resourcemanager.ha.rm-idsList of logical IDs for the RMs. e.g., “rm1,rm2”.
yarn.resourcemanager.hostname.rm-idFor each rm-id, specify the hostname the RM corresponds to. Alternately, one could set each of the RM’s service addresses.
yarn.resourcemanager.address.rm-idFor each rm-id, specify host:port for clients to submit jobs. If set, overrides the hostname set in yarn.resourcemanager.hostname.rm-id.
yarn.resourcemanager.scheduler.address.rm-idFor each rm-id, specify scheduler host:port for ApplicationMasters to obtain resources. If set, overrides the hostname set in yarn.resourcemanager.hostname.rm-id.
yarn.resourcemanager.resource-tracker.address.rm-idFor each rm-id, specify host:port for NodeManagers to connect. If set, overrides the hostname set in yarn.resourcemanager.hostname.rm-id.
yarn.resourcemanager.admin.address.rm-idFor each rm-id, specify host:port for administrative commands. If set, overrides the hostname set in yarn.resourcemanager.hostname.rm-id.
yarn.resourcemanager.webapp.address.rm-idFor each rm-id, specify host:port of the RM web application corresponds to. You do not need this if you set yarn.http.policy to HTTPS_ONLY. If set, overrides the hostname set in yarn.resourcemanager.hostname.rm-id.
yarn.resourcemanager.webapp.https.address.rm-idFor each rm-id, specify host:port of the RM https web application corresponds to. You do not need this if you set yarn.http.policy to HTTP_ONLY. If set, overrides the hostname set in yarn.resourcemanager.hostname.rm-id.
yarn.resourcemanager.ha.idIdentifies the RM in the ensemble. This is optional; however, if set, admins have to ensure that all the RMs have their own IDs in the config.
yarn.resourcemanager.ha.automatic-failover.enabledEnable automatic failover; By default, it is enabled only when HA is enabled.
yarn.resourcemanager.ha.automatic-failover.embeddedUse embedded leader-elector to pick the Active RM, when automatic failover is enabled. By default, it is enabled only when HA is enabled.
yarn.resourcemanager.cluster-idIdentifies the cluster. Used by the elector to ensure an RM doesn’t take over as Active for another cluster.
yarn.client.failover-proxy-providerThe class to be used by Clients, AMs and NMs to failover to the Active RM.
yarn.client.failover-max-attemptsThe max number of times FailoverProxyProvider should attempt failover.
yarn.client.failover-sleep-base-msThe sleep base (in milliseconds) to be used for calculating the exponential delay between failovers.
yarn.client.failover-sleep-max-msThe maximum sleep time (in milliseconds) between failovers.
yarn.client.failover-retriesThe number of retries per attempt to connect to a ResourceManager.
yarn.client.failover-retries-on-socket-timeoutsThe number of retries per attempt to connect to a ResourceManager on socket timeouts.

4、示例(最小配置)


 yarn.resourcemanager.ha.enabled
 true


 yarn.resourcemanager.cluster-id
 cluster1


 yarn.resourcemanager.ha.rm-ids
 rm1,rm2


 yarn.resourcemanager.hostname.rm1
 master1


 yarn.resourcemanager.hostname.rm2
 master2


 yarn.resourcemanager.webapp.address.rm1
 master1:8088


 yarn.resourcemanager.webapp.address.rm2
 master2:8088


 yarn.resourcemanager.zk-address
 zk1:2181,zk2:2181,zk3:2181

5、管理命令


查看节点状态:
$ yarn rmadmin -getServiceState rm1
active

$ yarn rmadmin -getServiceState rm2
standby

故障切换:

 $ yarn rmadmin -transitionToStandby rm1
$ yarn rmadmin -transitionToActive rm2

注意:
 开启自动故障切换后,系统为防止造成脑裂或其它不一致的状态,会拒绝人为管理HA状态。如果非常清楚自己的行为,可以在切换命令中指定-forcemanual选项。

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