無法加載類org.slf4j.impl.StaticLoggerBinder和無法加載原生的Hadoop庫

Question

我是新與Hadoop和MapReduce的一個任務過程中，我得到了以下錯誤：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 
SLF4J: Defaulting to no-operation (NOP) logger implementation 
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 
15/09/18 07:31:10 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 

我該如何解決這個？

謝謝！

Answer 1

這裏是你的錯誤，意思是：

對於SLF4J：

SLF4J: **Failed to load class** "org.slf4j.impl.StaticLoggerBinder". 
SLF4J: Defaulting to no-operation (NOP) logger implementation 
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 

正如你所知道的，你沒有相應的類（* 無法加載類*）爲SLF4J工作所以它默認爲不記錄（（NOP）記錄器實現）。繼建議link你可以看到這種情況的解決辦法是：

Placing one (and only one) of slf4j-nop.jar , slf4j-simple.jar , slf4j-log4j12.jar , slf4j-jdk14.jar or logback-classic.jar on the class path should solve the problem

Hadoop的：

15/09/18 07:31:10 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 

這只是意味着本機庫不能被發現，但一般不影響道路Hadoop功能。至於本機庫：

The native library just contains implementations of certain components for performance reasons and for non-availability of Java implementations. These components are available in a single, dynamically-linked native library called the native hadoop library. On the *nix platforms the library is named libhadoop.so.

無論如何，如果你真的想擺脫的警告，您可以按照提供here的衆多解決方案之一。