Hadoop 2.6.0：基本错误“启动MRAppMaster”安装后

问题描述

我刚刚开始使用Hadoop 2。

使用基本配置安装后，我总是无法运行任何示例。有没有人看到这个问题，并请帮助我？

而且错误是类似于

 启动MRAppMaster 
时出错java.lang.RuntimeException：java.lang.reflect.InvocationTargetException 
  

这是日志

  20152015-01-06 11：56：23,194 INFO [main] org.apache。 hadoop.mapreduce.v2.app.MRAppMaster：为应用程序创建MRAppMaster appattempt_1420510526926_0002_000001 
 2015-01-06 11：56：23,362 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster：启动MRAppMaster时出错
 
在org.apache.hadoop.util.ReflectionUtils.newInstance（ReflectionUtils.java:131）
在org中的java.lang.RuntimeException：java.lang.reflect.InvocationTargetException 
 .apache.hadoop.security.Groups。< init>（Groups.java:70）
 at org.apache.hadoop.security.Groups。< init>（Groups.java:66）
 at org.apache.hadoop.security.Groups.getUserToGroupsMappingService（Groups.java:280）
 at org.apac在org.apache.hadoop.security.UserGroupInformation.setConfiguration（UserGroupInformation.java:299）
处使用$ .b $ b $ hellop.security.UserGroupInformation.initialize（UserGroupInformation.java:271）。 mapreduce.v2.app.MRAppMaster.initAndStartAppMaster（MRAppMaster.java:1473）
位于org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main（MRAppMaster.java:1429）
 
导致：java.lang.reflect.InvocationTargetException $ b $在sun.reflect.NativeConstructorAccessorImpl.newInstance0（本地方法）
在sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
在java.lang.reflect.Constructor.newInstance（Constructor.java:408）
在org.apache.hadoop.util.ReflectionUtils .newInstance（ReflectionUtils.java:129）
 ... 7 more 
 
引起：java.lang.UnsatisfiedLinkError：org.apache.hadoop.security.JniBasedUnixGroupsMappi ng.anchorNative（）V 
 at org.apache.hadoop.security.JniBasedUnixGroupsMapping.anchorNative（Native Method）
 at org.apache.hadoop.security.JniBasedUnixGroupsMapping。< clinit>（JniBasedUnixGroupsMapping.java： 49）
 at org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback。< init>（JniBasedUnixGroupsMappingWithFallback.java:39）
 ... 12 more 
 
 2015-01-06 11：56：23,366 INFO [main] org.apache.hadoop.util.ExitUtil：以状态1退出
  

启动MRAppMaster，InvocationTargetException，UnsatisfiedLinkError错误消息

解决方案

根本原因：在类org.apache.hadoop.security.JniBasedUnixGroupsMapping中执行本地函数anchorNative失败

说明：函数anchorNative将调用库libhadoop.so中的函数。这个库的路径由这些环境变量指定：

  export JAVA_LIBRARY_PATH 
 export HADOOP_COMMON_LIB_NATIVE_DIR 
 
 code> 

在Hadoop源代码中，通过

打印java库类路径

<$ System.err.println（（System.getProperty（java.library.path））;

＃result
/ home / maidinh / hadoop2 / build / hadoop-2.6.0-src / hadoop-dist / target / hadoop-2.6.0 / lib / native：
/ usr / java / packages / lib / amd64：
/ usr / lib64：
/ lib64：
/ lib：
/ usr / lib


不同版本的库libhadoop.so可以在这些冲突地点找到。

解决方案： （在hadoop-2.6.0 / lib / native中），删除其他目录中的所有libhadoop.so。

$ b 注释：删除所有相关的hadoop库

  rm -r libhadoop * 
 rm -r libhdfs * 
  

I have just started to work with Hadoop 2.

After installing with basic configs, I always failed to run any examples. Has anyone seen this problem and please help me?

And the error is something like

Error starting MRAppMaster
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

This is the log

20152015-01-06 11:56:23,194 INFO [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Created MRAppMaster for application appattempt_1420510526926_0002_000001
2015-01-06 11:56:23,362 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:131)
at org.apache.hadoop.security.Groups.<init>(Groups.java:70)
at org.apache.hadoop.security.Groups.<init>(Groups.java:66)
at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:280)
at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:271)
at org.apache.hadoop.security.UserGroupInformation.setConfiguration(UserGroupInformation.java:299)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1473)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1429)

Caused by: java.lang.reflect.InvocationTargetException
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:408)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:129)
... 7 more

Caused by: java.lang.UnsatisfiedLinkError: org.apache.hadoop.security.JniBasedUnixGroupsMapping.anchorNative()V
at org.apache.hadoop.security.JniBasedUnixGroupsMapping.anchorNative(Native Method)
at org.apache.hadoop.security.JniBasedUnixGroupsMapping.<clinit>(JniBasedUnixGroupsMapping.java:49)
at org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback.<init>(JniBasedUnixGroupsMappingWithFallback.java:39)
... 12 more

2015-01-06 11:56:23,366 INFO [main] org.apache.hadoop.util.ExitUtil: Exiting with status 1

解决方案

Error messages: "Error starting MRAppMaster", "InvocationTargetException", "UnsatisfiedLinkError"

Root cause: Fail to execute the native function "anchorNative" in the class "org.apache.hadoop.security.JniBasedUnixGroupsMapping"

Description: the function "anchorNative" will call a function in the library "libhadoop.so". The path of this library is specified by these environment variables:

export JAVA_LIBRARY_PATH
export HADOOP_COMMON_LIB_NATIVE_DIR

In the Hadoop source code, print the java library class path by

System.err.println( (System.getProperty("java.library.path") );

# result
/home/maidinh/hadoop2/build/hadoop-2.6.0-src/hadoop-dist/target/hadoop-2.6.0/lib/native:
/usr/java/packages/lib/amd64:
/usr/lib64:
/lib64:
/lib:
/usr/lib

Different versions of the library "libhadoop.so" can be found in these locations that make a conflict.

Solution: Except the right path of native library (in hadoop-2.6.0/lib/native), delete all "libhadoop.so" in other directories.

Notes: delete all related libraries of hadoop

rm -r libhadoop*
rm -r libhdfs*

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