1、启动 HttpServer
this.server=new HttpServer("task",httpBindAddress, httpPort,
httpPort == 0, conf, aclsManager.getAdminsAcl());
server.start();
2、生成 DefaultTaskController
taskController= (TaskController)ReflectionUtils.newInstance(taskControllerClass,fConf);
3.JvmManager
this.jvmManager=new JvmManager(this);
4、TaskUmbilicalProtocol的实现
//set the numhandlers to max*2 since canCommit may wait for theduration
//of aheartbeat RPC
this.taskReportServer = RPC.getServer(this,bindAddress,
tmpPort, 2 * max, false, this.fConf, this.jobTokenSecretManager);
this.taskReportServer.start();
5.TrackerDistributedCacheManager
// InitializeDistributedCache
this.distributedCacheManager=new TrackerDistributedCacheManager(
this.fConf,taskController);
this.distributedCacheManager.startCleanupThread();
6、InterTrackerProtocol的客户端
this.jobClient = (InterTrackerProtocol)
UserGroupInformation.getLoginUser().doAs(
new PrivilegedExceptionAction＜Object＞(){
public Object run() throws IOException{
return RPC.waitForProxy(InterTrackerProtocol.class,
InterTrackerProtocol.versionID,
jobTrackAddr,fConf);
}
});
7、MapEventsFetcherThread
// start thethread that will fetch map task completion events
this.mapEventsFetcher = new MapEventsFetcherThread();
。。。
mapEventsFetcher.start();
8、TaskLauncher
mapLauncher = new TaskLauncher(TaskType.MAP, maxMapSlots);
reduceLauncher = new TaskLauncher(TaskType.REDUCE, maxReduceSlots);
mapLauncher.start();
reduceLauncher.start();
9、Heartbeat
// Send theheartbeat and process the jobtracker's directives
HeartbeatResponse heartbeatResponse = transmitHeartBeat(now);
通过DF命令得到FreeSpace，通过/proc/stat、/proc/meminfo、/proc/cpuinfo得到CPU、内存等信息。
通过调用 InterTrackerProtocol.heartbeat(。。。)传送到JobTracker
TaskTracker的RPC请求：heartbeatfrom 10.1.1.103
返回：LaunchTaskAction（Set[0],attempt_201404230054_0001_m_000004_0）
处理：startNewTask(tip)
启动JVM，命令:
bash -c/tmp/hadoop-admin/mapred/local/ttprivate/taskTracker/admin/jobcache/job_201404230054_0001/attempt_201404230054_0001_m_000004_0/taskjvm.sh
其中taskjvm.sh内容：
[/opt/jdk1.7.0_07/jre/bin/java,-Djava.library.path=/opt/hadoop-1.0.0/libexec/../lib/native/Linux-amd64-64:/tmp/hadoop-admin/mapred/local/taskTracker/admin/jobcache/job_201404230054_0001/attempt_201404230054_0001_r_000003_0/work,-Xmx200m, -Djava.net.preferIPv4Stack=true,-Dhadoop.metrics.log.level=WARN,-Djava.io.tmpdir=/tmp/hadoop-admin/mapred/local/taskTracker/admin/jobcache/job_201404230054_0001/attempt_201404230054_0001_r_000003_0/work/tmp,-classpath,/opt/hadoop-1.0.0/libexec/../conf:/opt/jdk1.7.0_07/lib/tools.jar:/opt/hadoop-1.0.0/libexec/..:/opt/hadoop-1.0.0/libexec/../hadoop-core-1.0.0.jar:/opt/hadoop-1.0.0/libexec/../lib/asm-3.2.jar:/opt/hadoop-1.0.0/libexec/../lib/aspectjrt-1.6.5.jar:/opt/hadoop-1.0.0/libexec/../lib/aspectjtools-1.6.5.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-beanutils-1.7.0.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-beanutils-core-1.8.0.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-cli-1.2.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-codec-1.4.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-collections-3.2.1.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-configuration-1.6.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-daemon-1.0.1.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-digester-1.8.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-el-1.0.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-httpclient-3.0.1.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-lang-2.4.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-logging-1.1.1.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-logging-api-1.0.4.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-math-2.1.jar:/opt/hadoop-1.0.0/libexec/../lib/commons-net-1.4.1.jar:/opt/hadoop-1.0.0/libexec/../lib/core-3.1.1.jar:/opt/hadoop-1.0.0/libexec/../lib/hadoop-capacity-scheduler-1.0.0.jar:/opt/hadoop-1.0.0/libexec/../lib/hadoop-fairscheduler-1.0.0.jar:/opt/hadoop-1.0.0/libexec/../lib/hadoop-thriftfs-1.0.0.jar:/opt/hadoop-1.0.0/libexec/../lib/hsqldb-1.8.0.10.jar:/opt/hadoop-1.0.0/libexec/../lib/jackson-core-asl-1.0.1.jar:/opt/hadoop-1.0.0/libexec/../lib/jackson-mapper-asl-1.0.1.jar:/opt/hadoop-1.0.0/libexec/../lib/jasper-compiler-5.5.12.jar:/opt/hadoop-1.0.0/libexec/../lib/jasper-runtime-5.5.12.jar:/opt/hadoop-1.0.0/libexec/../lib/jdeb-0.8.jar:/opt/hadoop-1.0.0/libexec/../lib/jersey-core-1.8.jar:/opt/hadoop-1.0.0/libexec/../lib/jersey-json-1.8.jar:/opt/hadoop-1.0.0/libexec/../lib/jersey-server-1.8.jar:/opt/hadoop-1.0.0/libexec/../lib/jets3t-0.6.1.jar:/opt/hadoop-1.0.0/libexec/../lib/jetty-6.1.26.jar:/opt/hadoop-1.0.0/libexec/../lib/jetty-util-6.1.26.jar:/opt/hadoop-1.0.0/libexec/../lib/jsch-0.1.42.jar:/opt/hadoop-1.0.0/libexec/../lib/junit-4.5.jar:/opt/hadoop-1.0.0/libexec/../lib/kfs-0.2.2.jar:/opt/hadoop-1.0.0/libexec/../lib/log4j-1.2.15.jar:/opt/hadoop-1.0.0/libexec/../lib/mockito-all-1.8.5.jar:/opt/hadoop-1.0.0/libexec/../lib/oro-2.0.8.jar:/opt/hadoop-1.0.0/libexec/../lib/servlet-api-2.5-20081211.jar:/opt/hadoop-1.0.0/libexec/../lib/slf4j-api-1.4.3.jar:/opt/hadoop-1.0.0/libexec/../lib/slf4j-log4j12-1.4.3.jar:/opt/hadoop-1.0.0/libexec/../lib/xmlenc-0.52.jar:/opt/hadoop-1.0.0/libexec/../lib/jsp-2.1/jsp-2.1.jar:/opt/hadoop-1.0.0/libexec/../lib/jsp-2.1/jsp-api-2.1.jar:/tmp/hadoop-admin/mapred/local/taskTracker/admin/jobcache/job_201404230054_0001/jars/classes:/tmp/hadoop-admin/mapred/local/taskTracker/admin/jobcache/job_201404230054_0001/jars:/tmp/hadoop-admin/mapred/local/taskTracker/admin/jobcache/job_201404230054_0001/attempt_201404230054_0001_r_000003_0/work,-Dhadoop.log.dir=/opt/hadoop-1.0.0/logs,-Dhadoop.root.logger=INFO,TLA,-Dhadoop.tasklog.taskid=attempt_201404230054_0001_r_000003_0,-Dhadoop.tasklog.iscleanup=false,-Dhadoop.tasklog.totalLogFileSize=0, org.apache.hadoop.mapred.Child, 127.0.0.1,48838, attempt_201404230054_0001_r_000003_0,/opt/hadoop-1.0.0/logs/userlogs/job_201404230054_0001/attempt_201404230054_0001_r_000003_0]