Examples with LAST_LEADER_ELECTION_ELAPSED_TIME org.apache.ratis.server.metrics.LeaderElectionMetrics.LAST_LEADER_ELECTION_ELAPSED_TIME used on opensource projects

Example 1 with LAST_LEADER_ELECTION_ELAPSED_TIME

use of org.apache.ratis.server.metrics.LeaderElectionMetrics.LAST_LEADER_ELECTION_ELAPSED_TIME in project incubator-ratis by apache.

the class LeaderElectionTests method testLeaderElectionMetrics.

@Test
public void testLeaderElectionMetrics() throws IOException, InterruptedException {
    Timestamp timestamp = Timestamp.currentTime();
    final MiniRaftCluster cluster = newCluster(3);
    cluster.start();
    final RaftServer.Division leaderServer = waitForLeader(cluster);
    final RatisMetricRegistry ratisMetricRegistry = LeaderElectionMetrics.getMetricRegistryForLeaderElection(leaderServer.getMemberId());
    // Verify each metric individually.
    long numLeaderElections = ratisMetricRegistry.counter(LEADER_ELECTION_COUNT_METRIC).getCount();
    assertTrue(numLeaderElections > 0);
    long numLeaderElectionTimeout = ratisMetricRegistry.counter(LEADER_ELECTION_TIMEOUT_COUNT_METRIC).getCount();
    assertTrue(numLeaderElectionTimeout > 0);
    Timer timer = ratisMetricRegistry.timer(LEADER_ELECTION_TIME_TAKEN);
    double meanTimeNs = timer.getSnapshot().getMean();
    long elapsedNs = timestamp.elapsedTime().toLong(TimeUnit.NANOSECONDS);
    assertTrue(timer.getCount() > 0 && meanTimeNs < elapsedNs);
    Long leaderElectionLatency = (Long) ratisMetricRegistry.getGauges((s, metric) -> s.contains(LAST_LEADER_ELECTION_ELAPSED_TIME)).values().iterator().next().getValue();
    assertTrue(leaderElectionLatency > 0L);
}