regionserver线程启动
/*
* Start maintenance Threads, Server, Worker and lease checker threads.
* Install an UncaughtExceptionHandler that calls abort of RegionServer if we
* get an unhandled exception. We cannot set the handler on all threads.
* Server's internal Listener thread is off limits. For Server, if an OOME, it
* waits a while then retries. Meantime, a flush or a compaction that tries to
* run should trigger same critical condition and the shutdown will run. On
* its way out, this server will shut down Server. Leases are sort of
* inbetween. It has an internal thread that while it inherits from Chore, it
* keeps its own internal stop mechanism so needs to be stopped by this
* hosting server. Worker logs the exception and exits.
*/
private void startServiceThreads() throws IOException {
String n = Thread.currentThread().getName();
// Start executor services
//各种类型的线程池 open_region,close_region,log_replay等线程池
this.service = new ExecutorService(getServerName().toShortString());
this.service.startExecutorService(ExecutorType.RS_OPEN_REGION,
conf.getInt("hbase.regionserver.executor.openregion.threads", 3));
this.service.startExecutorService(ExecutorType.RS_OPEN_META,
conf.getInt("hbase.regionserver.executor.openmeta.threads", 1));
this.service.startExecutorService(ExecutorType.RS_CLOSE_REGION,
conf.getInt("hbase.regionserver.executor.closeregion.threads", 3));
this.service.startExecutorService(ExecutorType.RS_CLOSE_META,
conf.getInt("hbase.regionserver.executor.closemeta.threads", 1));
if (conf.getBoolean(StoreScanner.STORESCANNER_PARALLEL_SEEK_ENABLE, false)) {
this.service.startExecutorService(ExecutorType.RS_PARALLEL_SEEK,
conf.getInt("hbase.storescanner.parallel.seek.threads", 10));
}
this.service.startExecutorService(ExecutorType.RS_LOG_REPLAY_OPS,
conf.getInt("hbase.regionserver.wal.max.splitters", SplitLogWorker.DEFAULT_MAX_SPLITTERS));
Threads.setDaemonThreadRunning(this.hlogRoller.getThread(), n + ".logRoller",
uncaughtExceptionHandler);//logRoller守护进程，每一个小时生成一个hlog
this.cacheFlusher.start(uncaughtExceptionHandler);
Threads.setDaemonThreadRunning(this.compactionChecker.getThread(), n +
".compactionChecker", uncaughtExceptionHandler);//compact定时进程
Threads.setDaemonThreadRunning(this.periodicFlusher.getThread(), n +
".periodicFlusher", uncaughtExceptionHandler);//memflush定时进程
if (this.healthCheckChore != null) {
Threads.setDaemonThreadRunning(this.healthCheckChore.getThread(), n + ".healthChecker",
uncaughtExceptionHandler);
}
if (this.nonceManagerChore != null) {
Threads.setDaemonThreadRunning(this.nonceManagerChore.getThread(), n + ".nonceCleaner",
uncaughtExceptionHandler);
}
// Leases is not a Thread. Internally it runs a daemon thread. If it gets
// an unhandled exception, it will just exit.
this.leases.setName(n + ".leaseChecker");
this.leases.start();//租期类（公用的租期类，定时发送请求）
//启动replication类
if (this.replicationSourceHandler == this.replicationSinkHandler &&
this.replicationSourceHandler != null) {
this.replicationSourceHandler.startReplicationService();
} else {
if (this.replicationSourceHandler != null) {
this.replicationSourceHandler.startReplicationService();
}
if (this.replicationSinkHandler != null) {
this.replicationSinkHandler.startReplicationService();
}
}
// Start Server. This service is like leases in that it internally runs
// a thread.
this.rpcServer.start();//启动rpc类（listener，responser，handler）
// Create the log splitting worker and start it
// set a smaller retries to fast fail otherwise splitlogworker could be blocked for
// quite a while inside HConnection layer. The worker won't be available for other
// tasks even after current task is preempted after a split task times out.
Configuration sinkConf = HBaseConfiguration.create(conf);
sinkConf.setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER,
conf.getInt("hbase.log.replay.retries.number", 8)); // 8 retries take about 23 seconds
sinkConf.setInt(HConstants.HBASE_RPC_TIMEOUT_KEY,
conf.getInt("hbase.log.replay.rpc.timeout", 30000)); // default 30 seconds
sinkConf.setInt("hbase.client.serverside.retries.multiplier", 1);
this.splitLogWorker = new SplitLogWorker(this.zooKeeper, sinkConf, this, this);
splitLogWorker.start();//启动split work类
}
