标签：false 私钥 upd status site ges inf out java
本贴记录学习hadoop中遇到的各种异常, 包括推荐系统分类下的和本分类下的, 持续更新
经检查, 配置文件错误, 私钥配置 root 前没加 /
插件版本 hadoop-eclipse-plugin-2.6.0
查看error.log为: "Map/Reduce location status updater".java.lang.NullPointerException
最后查看博客: http://blog.csdn.net/taoli1986/article/details/52892934, 因为没有在hdfs中建立根目录导致
解决: 在nameNode上新建根目录:
hdfs dfs -mkdir -p ~/first
后又出现权限问题, 修改hdfs-site.xml中权限认证
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/wenbronk/mapreduce/RunMapReduce : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at org.apache.hadoop.util.RunJar.main(RunJar.java:205)
原因: java版本不对, 代码编写使用jdk8, hadoop集群使用jdk7, 更换客户端jdk后解决
17/04/03 05:26:06 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.NoRouteToHostException: No route to host at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529) at org.apache.hadoop.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1526) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1328) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1281) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:526) 17/04/03 05:26:06 INFO hdfs.DFSClient: Abandoning BP-1159285863-192.168.208.106-1491149429179:blk_1073741826_1002 17/04/03 05:26:06 INFO hdfs.DFSClient: Excluding datanode 192.168.208.107:50010
原因: centos6.5 防火墙阻拦, 关掉防火墙后正常
标签：false 私钥 upd status site ges inf out java
原文地址：http://www.cnblogs.com/wenbronk/p/6661733.html
