Examples with ZKMBeanInfo org.apache.zookeeper.jmx.ZKMBeanInfo used on opensource projects

Example 1 with ZKMBeanInfo

use of org.apache.zookeeper.jmx.ZKMBeanInfo in project zookeeper by apache.

the class QuorumPeer method run.

@Override
public void run() {
    updateThreadName();
    LOG.debug("Starting quorum peer");
    try {
        jmxQuorumBean = new QuorumBean(this);
        MBeanRegistry.getInstance().register(jmxQuorumBean, null);
        for (QuorumServer s : getView().values()) {
            ZKMBeanInfo p;
            if (getId() == s.id) {
                p = jmxLocalPeerBean = new LocalPeerBean(this);
                try {
                    MBeanRegistry.getInstance().register(p, jmxQuorumBean);
                } catch (Exception e) {
                    LOG.warn("Failed to register with JMX", e);
                    jmxLocalPeerBean = null;
                }
            } else {
                RemotePeerBean rBean = new RemotePeerBean(s);
                try {
                    MBeanRegistry.getInstance().register(rBean, jmxQuorumBean);
                    jmxRemotePeerBean.put(s.id, rBean);
                } catch (Exception e) {
                    LOG.warn("Failed to register with JMX", e);
                }
            }
        }
    } catch (Exception e) {
        LOG.warn("Failed to register with JMX", e);
        jmxQuorumBean = null;
    }
    try {
        /*
             * Main loop
             */
        while (running) {
            switch(getPeerState()) {
                case LOOKING:
                    LOG.info("LOOKING");
                    if (Boolean.getBoolean("readonlymode.enabled")) {
                        LOG.info("Attempting to start ReadOnlyZooKeeperServer");
                        // Create read-only server but don't start it immediately
                        final ReadOnlyZooKeeperServer roZk = new ReadOnlyZooKeeperServer(logFactory, this, this.zkDb);
                        // Instead of starting roZk immediately, wait some grace
                        // period before we decide we're partitioned.
                        //
                        // Thread is used here because otherwise it would require
                        // changes in each of election strategy classes which is
                        // unnecessary code coupling.
                        Thread roZkMgr = new Thread() {

                            public void run() {
                                try {
                                    // lower-bound grace period to 2 secs
                                    sleep(Math.max(2000, tickTime));
                                    if (ServerState.LOOKING.equals(getPeerState())) {
                                        roZk.startup();
                                    }
                                } catch (InterruptedException e) {
                                    LOG.info("Interrupted while attempting to start ReadOnlyZooKeeperServer, not started");
                                } catch (Exception e) {
                                    LOG.error("FAILED to start ReadOnlyZooKeeperServer", e);
                                }
                            }
                        };
                        try {
                            roZkMgr.start();
                            reconfigFlagClear();
                            if (shuttingDownLE) {
                                shuttingDownLE = false;
                                startLeaderElection();
                            }
                            setCurrentVote(makeLEStrategy().lookForLeader());
                        } catch (Exception e) {
                            LOG.warn("Unexpected exception", e);
                            setPeerState(ServerState.LOOKING);
                        } finally {
                            // If the thread is in the the grace period, interrupt
                            // to come out of waiting.
                            roZkMgr.interrupt();
                            roZk.shutdown();
                        }
                    } else {
                        try {
                            reconfigFlagClear();
                            if (shuttingDownLE) {
                                shuttingDownLE = false;
                                startLeaderElection();
                            }
                            setCurrentVote(makeLEStrategy().lookForLeader());
                        } catch (Exception e) {
                            LOG.warn("Unexpected exception", e);
                            setPeerState(ServerState.LOOKING);
                        }
                    }
                    break;
                case OBSERVING:
                    try {
                        LOG.info("OBSERVING");
                        setObserver(makeObserver(logFactory));
                        observer.observeLeader();
                    } catch (Exception e) {
                        LOG.warn("Unexpected exception", e);
                    } finally {
                        observer.shutdown();
                        setObserver(null);
                        updateServerState();
                    }
                    break;
                case FOLLOWING:
                    try {
                        LOG.info("FOLLOWING");
                        setFollower(makeFollower(logFactory));
                        follower.followLeader();
                    } catch (Exception e) {
                        LOG.warn("Unexpected exception", e);
                    } finally {
                        follower.shutdown();
                        setFollower(null);
                        updateServerState();
                    }
                    break;
                case LEADING:
                    LOG.info("LEADING");
                    try {
                        setLeader(makeLeader(logFactory));
                        leader.lead();
                        setLeader(null);
                    } catch (Exception e) {
                        LOG.warn("Unexpected exception", e);
                    } finally {
                        if (leader != null) {
                            leader.shutdown("Forcing shutdown");
                            setLeader(null);
                        }
                        updateServerState();
                    }
                    break;
            }
            start_fle = Time.currentElapsedTime();
        }
    } finally {
        LOG.warn("QuorumPeer main thread exited");
        MBeanRegistry instance = MBeanRegistry.getInstance();
        instance.unregister(jmxQuorumBean);
        instance.unregister(jmxLocalPeerBean);
        for (RemotePeerBean remotePeerBean : jmxRemotePeerBean.values()) {
            instance.unregister(remotePeerBean);
        }
        jmxQuorumBean = null;
        jmxLocalPeerBean = null;
        jmxRemotePeerBean = null;
    }
}