- QuorumPeerMain
This is zookeeper start classes and services, which provides a main () method is used to start the service zookeeper, as follows:
public static void main(String[] args) {
QuorumPeerMain main = new QuorumPeerMain();
try {
main.initializeAndRun(args);
} catch (IllegalArgumentException e) {
LOG.error("Invalid arguments, exiting abnormally", e);
LOG.info(USAGE);
System.err.println(USAGE);
System.exit(ExitCode.INVALID_INVOCATION.getValue());
} catch (ConfigException e) {
LOG.error("Invalid config, exiting abnormally", e);
System.err.println("Invalid config, exiting abnormally");
System.exit(ExitCode.INVALID_INVOCATION.getValue());
} catch (DatadirException e) {
LOG.error("Unable to access datadir, exiting abnormally", e);
System.err.println("Unable to access datadir, exiting abnormally");
System.exit(ExitCode.UNABLE_TO_ACCESS_DATADIR.getValue());
} catch (AdminServerException e) {
LOG.error("Unable to start AdminServer, exiting abnormally", e);
System.err.println("Unable to start AdminServer, exiting abnormally");
System.exit(ExitCode.ERROR_STARTING_ADMIN_SERVER.getValue());
} catch (Exception e) {
LOG.error("Unexpected exception, exiting abnormally", e);
System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
}
LOG.info("Exiting normally");
System.exit(ExitCode.EXECUTION_FINISHED.getValue());
}
It does two things, one: initialize QuorumPeerMain, two: initializeAndRun (args) to start the service then look at initializeAndRun (args) This method:
protected void initializeAndRun(String[] args)
throws ConfigException, IOException, AdminServerException
{
QuorumPeerConfig config = new QuorumPeerConfig();
if (args.length == 1) {
config.parse(args[0]);
}
// Start and schedule the the purge task
DatadirCleanupManager purgeMgr = new DatadirCleanupManager(config
.getDataDir(), config.getDataLogDir(), config
.getSnapRetainCount(), config.getPurgeInterval());
purgeMgr.start();
if (args.length == 1 && config.isDistributed()) {
runFromConfig(config);
} else {
LOG.warn("Either no config or no quorum defined in config, running "
+ " in standalone mode");
// there is only server in the quorum -- run as standalone
ZooKeeperServerMain.main(args);
}
}
Here to do three things:
1. resolve zookeeper's profile
2. Create a data file and start the clean-up manager (including snapshots and transaction log files)
3. judge stand-alone or distributed deployment to start zookeeper
Cluster model will be called runFromConfig (config) method to start this service zookeeper
public void runFromConfig(QuorumPeerConfig config)
throws IOException, AdminServerException
{
try {
ManagedUtil.registerLog4jMBeans();
} catch (JMException e) {
LOG.warn("Unable to register log4j JMX control", e);
}
LOG.info("Starting quorum peer");
MetricsProvider metricsProvider;
try {
metricsProvider = MetricsProviderBootstrap
.startMetricsProvider(config.getMetricsProviderClassName(),
config.getMetricsProviderConfiguration());
} catch (MetricsProviderLifeCycleException error) {
throw new IOException("Cannot boot MetricsProvider " + config.getMetricsProviderClassName(),
error);
}
try {
ServerMetrics.metricsProviderInitialized(metricsProvider);
ServerCnxnFactory cnxnFactory = null;
ServerCnxnFactory secureCnxnFactory = null;
if (config.getClientPortAddress() != null) {
cnxnFactory = ServerCnxnFactory.createFactory();
cnxnFactory.configure(config.getClientPortAddress(),
config.getMaxClientCnxns(),
config.getClientPortListenBacklog(), false);
}
if (config.getSecureClientPortAddress() != null) {
secureCnxnFactory = ServerCnxnFactory.createFactory();
secureCnxnFactory.configure(config.getSecureClientPortAddress(),
config.getMaxClientCnxns(),
config.getClientPortListenBacklog(), true);
}
quorumPeer = getQuorumPeer();
quorumPeer.setTxnFactory(new FileTxnSnapLog(
config.getDataLogDir(),
config.getDataDir()));
quorumPeer.enableLocalSessions(config.areLocalSessionsEnabled());
quorumPeer.enableLocalSessionsUpgrading(
config.isLocalSessionsUpgradingEnabled());
//quorumPeer.setQuorumPeers(config.getAllMembers());
quorumPeer.setElectionType(config.getElectionAlg());
quorumPeer.setMyid(config.getServerId());
quorumPeer.setTickTime(config.getTickTime());
quorumPeer.setMinSessionTimeout(config.getMinSessionTimeout());
quorumPeer.setMaxSessionTimeout(config.getMaxSessionTimeout());
quorumPeer.setInitLimit(config.getInitLimit());
quorumPeer.setSyncLimit(config.getSyncLimit());
quorumPeer.setObserverMasterPort(config.getObserverMasterPort());
quorumPeer.setConfigFileName(config.getConfigFilename());
quorumPeer.setClientPortListenBacklog(config.getClientPortListenBacklog());
quorumPeer.setZKDatabase(new ZKDatabase(quorumPeer.getTxnFactory()));
quorumPeer.setQuorumVerifier(config.getQuorumVerifier(), false);
if (config.getLastSeenQuorumVerifier()!=null) {
quorumPeer.setLastSeenQuorumVerifier(config.getLastSeenQuorumVerifier(), false);
}
quorumPeer.initConfigInZKDatabase();
quorumPeer.setCnxnFactory(cnxnFactory);
quorumPeer.setSecureCnxnFactory(secureCnxnFactory);
quorumPeer.setSslQuorum(config.isSslQuorum());
quorumPeer.setUsePortUnification(config.shouldUsePortUnification());
quorumPeer.setLearnerType(config.getPeerType());
quorumPeer.setSyncEnabled(config.getSyncEnabled());
quorumPeer.setQuorumListenOnAllIPs(config.getQuorumListenOnAllIPs());
if (config.sslQuorumReloadCertFiles) {
quorumPeer.getX509Util().enableCertFileReloading();
}
// sets quorum sasl authentication configurations
quorumPeer.setQuorumSaslEnabled(config.quorumEnableSasl);
if(quorumPeer.isQuorumSaslAuthEnabled()){
quorumPeer.setQuorumServerSaslRequired(config.quorumServerRequireSasl);
quorumPeer.setQuorumLearnerSaslRequired(config.quorumLearnerRequireSasl);
quorumPeer.setQuorumServicePrincipal(config.quorumServicePrincipal);
quorumPeer.setQuorumServerLoginContext(config.quorumServerLoginContext);
quorumPeer.setQuorumLearnerLoginContext(config.quorumLearnerLoginContext);
}
quorumPeer.setQuorumCnxnThreadsSize(config.quorumCnxnThreadsSize);
quorumPeer.initialize();
if(config.jvmPauseMonitorToRun) {
quorumPeer.setJvmPauseMonitor(new JvmPauseMonitor(config));
}
quorumPeer.start();
quorumPeer.join();
} catch (InterruptedException e) {
// warn, but generally this is ok
LOG.warn("Quorum Peer interrupted", e);
} finally {
if (metricsProvider != null) {
try {
metricsProvider.stop();
} catch (Throwable error) {
LOG.warn("Error while stopping metrics", error);
}
}
}
}
The way to do a few things:
1. Register log4j JMX controls
2. Create performance statistics class MetricsProvider
3. Create a service and client communication factory class ServerCnxnFactory
4. initialize and start this thread QuorumPeer