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This article mainly explains "how to solve the problem of Hadoop2.7 startup newspaper WARN util.NativeCodeLoader". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "how to solve the problem of Hadoop2.7 startup newspaper WARN util.NativeCodeLoader"!

Configuration environment: ubutun14.04 64-bit

Hadoop2.7

Launch hadoop2.7 today and report WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... The problem follows the using builtin-java classes where applicable.

After searching for the results, the following solutions are common on the Internet:

Add a local library statement to .bashr or / etc/profile:

Export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native

Export HADOOP_OPTS= "- Djava.library.path=$HADOOP_HOME/lib"

But this method does not apply to me. So I looked for other ways, and later I carefully read the introduction of the local library on the official website (http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/NativeLibraries.html) and online materials (http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/NativeLibraries.html)), only to find that it was the util.NativeCodeLoader problem. See http://grepcode.com/file/repo1.maven.org/maven2/com.ning/metrics.action/0.2.6/org/apache/hadoop/util/NativeCodeLoader.java/ for the code.

So according to the introduction, open log4j.properties in the $Hadoop_home/etc/hadoop/ directory, add a statement: log4j.logger.org.apache.hadoop.util.NativeCodeLoader=DEBUG, start and report an error

DEBUG util.NativeCodeLoader: Failed to load native-hadoop with error: java.lang.UnsatisfiedLinkError: / opt/hadoop/lib/native/libhadoop.so.1.0.0: / lib64/libc.so.6: version `GLIBC_2.14' not found (required by / opt/hadoop/lib/native/libhadoop.so.1.0.0).

After changing it to log4j.logger.org.apache.hadoop.util.NativeCodeLoader=ERROR, the startup does not report an error, and the result is as follows

The reason for this revision can be carefully pondered by yourself.

Main reference:

Http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/NativeLibraries.html

Http://stackoverflow.com/questions/19943766/hadoop-unable-to-load-native-hadoop-library-for-your-platform-warning

At this point, I believe you have a deeper understanding of "how to solve the problem of Hadoop2.7 startup newspaper WARN util.NativeCodeLoader". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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