Hadoop 3.3.0问题解决汇总

启动 HDFS

[zhangbin@hadoop102 hadoop-3.3.0]$  sbin/start-dfs.sh

异常信息：

hadoop102: ERROR: Cannot set priority of namenode process 35346

解决方法：

　切换到hadoop日志目录：

　[zhangbin@hadoop102 hadoop-3.3.0]$ cd logs/

   查看日志信息：

    [zhangbin@hadoop102 logs]$ cat hadoop-zhangbin-namenode-hadoop102.log

    异常信息大体为这样：

2021-04-05 10:21:36,656 INFO org.apache.hadoop.http.HttpServer2: HttpServer.start() threw a non Bind IOException
java.net.BindException: Port in use: hadoop102:9870
at org.apache.hadoop.http.HttpServer2.constructBindException(HttpServer2.java:1292)
at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1314)
at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1373)
at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:1223)
at org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:170)
at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:946)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:757)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:1014)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:987)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1756)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1821)
Caused by: java.io.IOException: Failed to bind to hadoop102/192.168.10.102:9870
at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:346)
at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:307)
at org.apache.hadoop.http.HttpServer2.bindListener(HttpServer2.java:1279)
at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1310)
... 9 more
Caused by: java.net.BindException: 地址已在使用
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:342)
... 12 more

解决方法：找到到占用端口，并杀死

[zhangbin@hadoop102 logs]$ lsof -i:9870 -P

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 22003 zhangbin 289u IPv4 89125 0t0 TCP hadoop102:9870 (LISTEN)

[zhangbin@hadoop102 logs]$ kill -9 22003

重新启动即可

DataNode和NameNode进程同时只能有一个工作(启动集群之后，DataNode无法启动)

 

原因->借用一张图(分析原因)：

解决办法：

　　停止所有hadoop节点的所有服务

　　删除每个服务节点（服务器）中的DataNode里面的信息（默认在/tmp，我的在DataNode信息配置在了hadoop项目根目录的data中， 并且删除hadoop下的logs目录，删除这两个目录里的所有文件）

　　重新格式化hadoop：指令：

　　　　　　　　　　　　hdfs namenode -format

       启动hadoop服务即可