hadoop 常见错误(遇到补充)

name 文件夹不存在

• 错误描述：Directory /usr/local/src/hadoop/tmp/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible.
• 处理方法：创建name文件 重新格式化 再次启动
  

namenode 无法启动

• 错误描述：当把 hadoop 停止之后，再次启动 没有namenode节点
• 处理方法：清空临时目录tmp里面的data下的东西,再次启动
  

namenode 处于安全模式

• 错误描述Name node is in safe mode. Name node处于安全模式
• 处理方式：
  • 关闭安全模式 hadoop dfsadmin -safemode leave
  • 进入安全模式 hadoop dfsadmin -safemode enter

Hive 无法跑MR任务

• 错误描述

Task with the most failures(4): 
-----
Task ID:
  task_1594519690907_0001_m_000000

URL:
  http://0.0.0.0:8088/taskdetails.jsp?jobid=job_1594519690907_0001&tipid=task_1594519690907_0001_m_000000
-----
Diagnostic Messages for this Task:
Container launch failed for container_1594519690907_0002_01_000005 : org.apache.hadoop.yarn.exceptions.InvalidAuxServiceException: The auxService:mapreduce_shuffle does not exist
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.hadoop.yarn.api.records.impl.pb.SerializedExceptionPBImpl.instantiateExceptionImpl(SerializedExceptionPBImpl.java:171)
    at org.apache.hadoop.yarn.api.records.impl.pb.SerializedExceptionPBImpl.instantiateException(SerializedExceptionPBImpl.java:182)
    at org.apache.hadoop.yarn.api.records.impl.pb.SerializedExceptionPBImpl.deSerialize(SerializedExceptionPBImpl.java:106)
    at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl$Container.launch(ContainerLauncherImpl.java:162)
    at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl$EventProcessor.run(ContainerLauncherImpl.java:393)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
MapReduce Jobs Launched: 
Stage-Stage-1: Map: 1  Reduce: 1   HDFS Read: 0 HDFS Write: 0 FAIL
Total MapReduce CPU Time Spent: 0 msec

• 处理方式：

# 确认 yarn-site.xml 的配置是否正确

<!--NodeManager获取数据的方式-->
<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
</property>

# 然后重启 Hadoop