hadoop常见错误
错误⼀：本地运⾏Java 代码时出出现：孔子拜师歇后语下一句
2018-09-14 19:45:07,266 DEBUG org.apache.hadoop.util.Shell.checkHadoopHome() - Failed to detect a valid hadoop home directory
java.io.IOException: HADOOP_HOME or hadoop.home.dir are not t.
2018-09-14 19:45:07,275 ERROR org.apache.hadoop.WinUtilsPath() - Failed to locate the winutils binary in the hadoop binary path
java.io.IOException: Could not locate executable null\ in the Hadoop binaries.
解决：把hadoop安装⽬录下的hadoop.dll考到system32⽬录下
错误⼆：运⾏mapreduce
Job job_1536830416611_0021 failed with state FAILED due to: Application application_1536830416611_0021 failed 2 times due to Error launching appattempt_1536830416611_0021_000002. Got exception:
门简笔画
org.apache.ptions.YarnException: Unauthorized request to start container.
This token is expired. current time is 1536878358609 found 1536837804741
Note: System times on machines may be out of sync. Check system time and time zones.
没有同步时间
解决：狗狗打呼噜正常吗
在namenode 和datanode所在的服务器上都输⼊：
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
p 进⾏时间同步苹果核简笔画
如果在p 时 出现 the NTP socket is in u, exiting
⽤ ps -ef|grep ntp 查出进程后 杀死
错误三：
离园活动有哪些启动zookeeper 服务时
zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.10/bin/../conf/zoo.cfg
Error contacting rvice. It is probably not running.恋爱动机
删除 /etc/hosts 中的 127.0.0.0拿⼀⾏
错误四：
linux的shell脚本运⾏出现失败
shell 脚本在/usr/local/bin 下 不管在哪执⾏都可以不⽤写路径快乐男生主题曲
-bash: /usr/local/bin/xcall.sh: /bin/bash^M: bad interpreter:
在⾏末模式下输⼊t ff回车，查看当前的模式，如果时doc就通过t fileformat=unix修改成unix
错误五：
Connection refud
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at keeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at keeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
18/09/19 19:41:53 INFO ipc.Client: Retrying connect to rver: hadoop03/192.168.136.130:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)(所有journalnode都得开启，才能format namenode)
错误六：
2018-09-19 20:22:04,275 FATAL org.apache.hadoop.ha.ZKFailoverController: Unable to start failover controller. Parent znode does not exist.欧洲亚洲
Run with -formatZK flag to initialize ZooKeeper.
（要保证所有设置的zookeper集群的zookeeper服务都开启 才能 格式化 ）
