#riemann-storm-monitor

riemann-storm-monitor is a library that acts as a riemann agent. This library supplies various useful tools for monitoring of storm topologies.

Usage

The main classes of the library are the MonitoredBolt and MonitoredSpout classes. These classes act as wrappers to other bolts and spouts. These classes are used when defining a topology -

TopologyBuilder builder = new TopologyBuilder();
builder.setSpout("testMockSpout",new MonitoredSpout(new MockSpout()), 1);
builder.setBolt("testMockBolt", new MonitoredBolt(new MockBolt()), 1).localOrShuffleGrouping("testMockSpout");

You should pass configuration for latency map. Set the required values when initializing the topology (if not passed, default values will be used): conf.put("topology.monitoring.latencies.map.maxSize", 500); conf.put("topology.monitoring.latencies.map.maxTimeSeconds", 120); conf.put("topology.monitoring.latencies.map.maxConcurrency", 4);

Features

The riemann-storm-monitor supplies various monitoring tools -

• Events and Functions Throughput measuring - the usage of this feature requires the user's bolt/spout classes to implement the interface "EventsAware". The implementation is as such -

  public class MockSpout implements EventsAware {
    private EventSender es;
    
    @Override
    public void setEventSender(EventSender es) {
        this.es = es;
    }
    ...
    private foo() {
      es.sendEvent("sent each time foo is called","foo called",1,"mytag1","mytag2");
    }
  }

• **IEvenSender events (from EventSender.java)

• Bolt / Spout latency monitoring - the usage of this feature is automatic.