錯誤一：本地運(yùn)行Java 代碼時出出現(xiàn)：
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 set.
2018-09-14 19:45:07,275 ERROR org.apache.hadoop.util.Shell.getWinUtilsPath() - Failed to locate the winutils binary in the hadoop binary path
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.
解決：把hadoop安裝目錄下的hadoop.dll考到system32目錄下
錯誤二：運(yùn)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: org.apache.hadoop.yarn.exceptions.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.
沒有同步時間
解決：
在namenode 和datanode所在的服務(wù)器上都輸入：
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
ntpdate pool.ntp.org? 進(jìn)行時間同步
如果在ntpdate pool.ntp.org? 時 出現(xiàn)? the NTP socket is in use, exiting
用 ps -ef|grep ntp 查出進(jìn)程后 殺死
錯誤三：
啟動zookeeper 服務(wù)時
zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.10/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
刪除 /etc/hosts 中的 127.0.0.0拿一行
錯誤四：
linux的shell腳本運(yùn)行出現(xiàn)失敗
shell 腳本在/usr/local/bin 下 不管在哪執(zhí)行都可以不用寫路徑
-bash: /usr/local/bin/xcall.sh: /bin/bash^M: bad interpreter:
在行末模式下輸入set ff回車塘匣，查看當(dāng)前的模式冯痢，如果時doc就通過set fileformat=unix修改成unix
錯誤五：
Connection refused
? at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
? at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
? at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
? at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
18/09/19 19:41:53 INFO ipc.Client: Retrying connect to server: hadoop03/192.168.136.130:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)(所有journalnode都得開啟，才能format namenode)
錯誤六：
2018-09-19 20:22:04,275 FATAL org.apache.hadoop.ha.ZKFailoverController: Unable to start failover controller. Parent znode does not exist.
Run with -formatZK flag to initialize ZooKeeper.
（要保證所有設(shè)置的zookeper集群的zookeeper服務(wù)都開啟 才能 格式化 ）
