Example usage for org.apache.cassandra.concurrent Stage GOSSIP

Introduction

In this page you can find the example usage for org.apache.cassandra.concurrent Stage GOSSIP.

Prototype

Stage GOSSIP

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Usage

From source file:org.wildfly.extension.cassandra.WildflyCassandraDaemon.java

License:Apache License

private void waitForGossipToSettle() {
    int forceAfter = Integer.getInteger("cassandra.skip_wait_for_gossip_to_settle", -1);
    if (forceAfter == 0) {
        return;//from  ww w .j  a  va  2  s.com
    }
    final int GOSSIP_SETTLE_MIN_WAIT_MS = 5000;
    final int GOSSIP_SETTLE_POLL_INTERVAL_MS = 1000;
    final int GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED = 3;

    CassandraLogger.LOGGER.infof("Waiting for gossip to settle before accepting client requests...");
    Uninterruptibles.sleepUninterruptibly(GOSSIP_SETTLE_MIN_WAIT_MS, TimeUnit.MILLISECONDS);
    int totalPolls = 0;
    int numOkay = 0;
    JMXEnabledThreadPoolExecutor gossipStage = (JMXEnabledThreadPoolExecutor) StageManager
            .getStage(Stage.GOSSIP);
    while (numOkay < GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED) {
        Uninterruptibles.sleepUninterruptibly(GOSSIP_SETTLE_POLL_INTERVAL_MS, TimeUnit.MILLISECONDS);
        long completed = gossipStage.getCompletedTasks();
        long active = gossipStage.getActiveCount();
        long pending = gossipStage.getPendingTasks();
        totalPolls++;
        if (active == 0 && pending == 0) {
            CassandraLogger.LOGGER.debugf("Gossip looks settled. CompletedTasks: {}", completed);
            numOkay++;
        } else {
            CassandraLogger.LOGGER.infof(
                    "Gossip not settled after {} polls. Gossip Stage active/pending/completed: {}/{}/{}",
                    totalPolls, active, pending, completed);
            numOkay = 0;
        }
        if (forceAfter > 0 && totalPolls > forceAfter) {
            CassandraLogger.LOGGER.warnf(
                    "Gossip not settled but startup forced by cassandra.skip_wait_for_gossip_to_settle. Gossip Stage total/active/pending/completed: {}/{}/{}/{}",
                    totalPolls, active, pending, completed);
            break;
        }
    }
    if (totalPolls > GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED)
        CassandraLogger.LOGGER.infof("Gossip settled after {} extra polls; proceeding",
                totalPolls - GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED);
    else
        CassandraLogger.LOGGER.infof("No gossip backlog; proceeding");
}

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