hadoop2.x常用端口、定义方法及默认端口、hadoop1.X端口对比

怼烎@ 2022-05-31 12:58 195阅读 0赞

问题导读：

1.DataNode的http服务的端口、ipc服务的端口分别是哪个？

2.NameNode的http服务的端口、ipc服务的端口分别是哪个？

3.journalnode的http服务的端口、ipc服务的端口分别是哪个？

4.ResourceManager的http服务端口是哪个？

5.NodeManager的http服务端口是哪个？

6.Master的http服务的端口、ipc服务的端口分别是哪个？

7.3888是谁的端口，用来做什么？

扩展：

hadoop1.X对应端口是哪个？

9000、9001分别对应是hadoop2.X的那个端口？

Hadoop集群的各部分一般都会使用到多个端口，有些是daemon之间进行交互之用，有些是用于RPC访问以及HTTP访问。而随着Hadoop周边组件的增多，完全记不住哪个端口对应哪个应用，特收集记录如此，以便查询。

这里包含我们使用到的组件：HDFS, YARN, HBase, Hive, ZooKeeper:

<table style="margin:0px;padding:0px;border-spacing:0px;border:1px solid #C0C0C0;color:rgb(0,0,0);font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;background-color:rgb(238,238,238);"> 
 <tbody style="margin:0px;padding:0px;"> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">组件</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">节点</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">默认端口</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">配置</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">用途说明</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">DataNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">50010</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.datanode.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">datanode服务端口，用于数据传输</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">DataNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">50075</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.datanode.http.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">DataNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">50475</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.datanode.https.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">https服务的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">DataNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">50020</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.datanode.ipc.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ipc服务的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NameNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">50070</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.namenode.http-address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NameNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">50470</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.namenode.https-address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">https服务的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NameNode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8020</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">fs.defaultFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">接收Client连接的RPC端口，用于获取文件系统metadata信息。</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">journalnode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8485</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.journalnode.rpc-address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">RPC服务</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">journalnode</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8480</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.journalnode.http-address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HTTP服务</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HDFS</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ZKFC</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8019</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">dfs.ha.zkfc.port</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ZooKeeper FailoverController，用于NN HA</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ResourceManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8032</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.resourcemanager.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">RM的applications manager(ASM)端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ResourceManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8030</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.resourcemanager.scheduler.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">scheduler组件的IPC端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ResourceManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8031</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.resourcemanager.resource-tracker.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">IPC</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ResourceManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8033</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.resourcemanager.admin.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">IPC</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ResourceManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8088</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.resourcemanager.webapp.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NodeManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8040</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.nodemanager.localizer.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">localizer IPC</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NodeManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8042</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.nodemanager.webapp.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NodeManager</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">8041</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">yarn.nodemanager.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">NM中container manager的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">JobHistory Server</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">10020</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">mapreduce.jobhistory.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">IPC</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">YARN</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">JobHistory Server</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">19888</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">mapreduce.jobhistory.webapp.address</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Master</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">60000</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.master.port</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">IPC</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Master</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">60010</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.master.info.port</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">RegionServer</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">60020</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.regionserver.port</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">IPC</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">RegionServer</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">60030</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.regionserver.info.port</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">http服务端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HQuorumPeer</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">2181</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.zookeeper.property.clientPort</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase-managed ZK mode，使用独立的ZooKeeper集群则不会启用该端口。</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HQuorumPeer</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">2888</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.zookeeper.peerport</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase-managed ZK mode，使用独立的ZooKeeper集群则不会启用该端口。</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HQuorumPeer</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">3888</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">hbase.zookeeper.leaderport</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HBase-managed ZK mode，使用独立的ZooKeeper集群则不会启用该端口。</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Hive</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Metastore</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">9083</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">/etc/default/hive-metastore中export PORT=&lt;port&gt;来更新默认端口</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">&nbsp;</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Hive</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">HiveServer</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">10000</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">/etc/hive/conf/hive-env.sh中export HIVE_SERVER2_THRIFT_PORT=&lt;port&gt;来更新默认端口</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">&nbsp;</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ZooKeeper</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Server</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">2181</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">/etc/zookeeper/conf/zoo.cfg中clientPort=&lt;port&gt;</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">对客户端提供服务的端口</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ZooKeeper</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Server</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">2888</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">/etc/zookeeper/conf/zoo.cfg中server.x=[hostname]:nnnnn[:nnnnn]，标蓝部分</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">follower用来连接到leader，只在leader上监听该端口。</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">ZooKeeper</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Server</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">3888</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">/etc/zookeeper/conf/zoo.cfg中server.x=[hostname]:nnnnn[:nnnnn]，标蓝部分</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">用于leader选举的。只在electionAlg是1,2或3(默认)时需要。</td> 
  </tr> 
 </tbody> 
</table>

所有端口协议均基于TCP。

对于存在Web UI（HTTP服务）的所有hadoop daemon，有如下url：

/logs   
日志文件列表，用于下载和查看

/logLevel   
允许你设定log4j的日志记录级别，类似于hadoop daemonlog

/stacks   
所有线程的stack trace，对于debug很有帮助

/jmx   
服务端的Metrics，以JSON格式输出。

/jmx?qry=Hadoop:\*会返回所有hadoop相关指标。   
/jmx?get=MXBeanName::AttributeName 查询指定bean指定属性的值，例如/jmx?get=Hadoop:service=NameNode,name=NameNodeInfo::ClusterId会返回ClusterId。   
这个请求的处理类：org.apache.hadoop.jmx.JMXJsonServlet

而特定的Daemon又有特定的URL路径特定相应信息。

NameNode:http://:50070/

/dfshealth.jsp   
HDFS信息页面，其中有链接可以查看文件系统

/dfsnodelist.jsp?whatNodes=(DEAD|LIVE)   
显示DEAD或LIVE状态的datanode

/fsck   
运行fsck命令，不推荐在集群繁忙时使用！

DataNode:http://:50075/

/blockScannerReport   
每个datanode都会指定间隔验证块信息