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https://issues.apache.org/jira/browse/HDFS-13480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853217#comment-16853217
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Íñigo Goiri commented on HDFS-13480:
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+1 on [^HDFS-13480-HDFS-13891-08.patch].
> RBF: Separate namenodeHeartbeat and routerHeartbeat to different config key
> ---------------------------------------------------------------------------
>
> Key: HDFS-13480
> URL: https://issues.apache.org/jira/browse/HDFS-13480
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: maobaolong
> Assignee: maobaolong
> Priority: Major
> Attachments: HDFS-13480-HDFS-13891-05.patch,
> HDFS-13480-HDFS-13891-06.patch, HDFS-13480-HDFS-13891-07.patch,
> HDFS-13480-HDFS-13891-08.patch, HDFS-13480.001.patch, HDFS-13480.002.patch,
> HDFS-13480.002.patch, HDFS-13480.003.patch, HDFS-13480.004.patch
>
>
> Now, if i enable the heartbeat.enable, but i do not want to monitor any
> namenode, i get an ERROR log like:
> {code:java}
> [2018-04-19T14:00:03.057+08:00] [ERROR]
> federation.router.Router.serviceInit(Router.java 214) [main] : Heartbeat is
> enabled but there are no namenodes to monitor
> {code}
> and if i disable the heartbeat.enable, we cannot get any mounttable update,
> because the following logic in Router.java：
> {code:java}
> if (conf.getBoolean(
> RBFConfigKeys.DFS_ROUTER_HEARTBEAT_ENABLE,
> RBFConfigKeys.DFS_ROUTER_HEARTBEAT_ENABLE_DEFAULT)) {
> // Create status updater for each monitored Namenode
> this.namenodeHeartbeatServices = createNamenodeHeartbeatServices();
> for (NamenodeHeartbeatService hearbeatService :
> this.namenodeHeartbeatServices) {
> addService(hearbeatService);
> }
> if (this.namenodeHeartbeatServices.isEmpty()) {
> LOG.error("Heartbeat is enabled but there are no namenodes to
> monitor");
> }
> // Periodically update the router state
> this.routerHeartbeatService = new RouterHeartbeatService(this);
> addService(this.routerHeartbeatService);
> }
> {code}
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