[AMBARI-25601] Ambari with AMS HA unable to change metrics collector for metrics providing on collector fail

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.5
• Fix Version/s: 2.8.0, 2.7.6
• Component/s: ambari-server
• Assignee: Dmytro Grinenko
• Reporter: Dmytro Vitiuk
• Created: 10/Dec/20 09:46
• Updated: 22/Nov/22 09:23
• Resolved: 16/Dec/20 10:19

Description

It is expected that ambari server should select another available metrics collector for metrics retrieval on current collector fail. But actually we have the next numerous exceptions. Of course in this case metrics are unavailable via ambari API.

2020-12-10 08:41:44,402 ERROR [pool-3-thread-1] ambari-event-bus:232 - Exception thrown by subscriber method onMetricsCollectorHostDownEvent(org.apache.ambari.server.events.MetricsCollectorHostDownEvent) on subscriber org.apache.ambari.server.controller.metrics.MetricsCollectorHAManager@470dea54 when dispatching event: MetricsCollectorHostDownEvent{eventType=METRICS_COLLECTOR_HOST_DOWN}
java.lang.NullPointerException
        at org.apache.ambari.server.controller.metrics.CollectorHostDownRefreshCounter.testRefreshCounter(CollectorHostDownRefreshCounter.java:33)
        at org.apache.ambari.server.controller.metrics.MetricsCollectorHAClusterState.onCollectorHostDown(MetricsCollectorHAClusterState.java:117)
        at org.apache.ambari.server.controller.metrics.MetricsCollectorHAManager.onMetricsCollectorHostDownEvent(MetricsCollectorHAManager.java:126)
        at sun.reflect.GeneratedMethodAccessor569.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:87)
        at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:144)
        at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:72)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

Issue Links

• links to: GitHub PR#3274
• links to: GitHub PR#3556