Why Does Hadoop Show 'Unable to Load Native-Hadoop Library' and How Can I Fix It?

Hadoop Warning: "Unable to Load Native-Hadoop Library for Your Platform"

When configuring Hadoop on a CentOS server, users may encounter the following error when running start-dfs.sh or stop-dfs.sh:

WARN util.NativeCodeLoader: Unable to load native-hadoop library for
your platform... using builtin-java classes where applicable

This warning, commonly encountered with Hadoop 2.2.0, primarily stems from a mismatch between the native Hadoop library and the platform architecture. In this specific case, the native library may have been compiled for a 32-bit system while the server is running on a 64-bit architecture.

Although the warning indicates a potential issue, it typically does not affect Hadoop's functionality. However, if you wish to resolve the warning, you can consider the following steps:

1. Verify that you are running Hadoop on a 64-bit CentOS system.
2. Recompile the Hadoop source code on a 64-bit system. This will create a 64-bit version of the native Hadoop library.
3. Replace the existing 32-bit library ($HADOOP_HOME/lib/native/libhadoop.so.1.0.0) with the newly compiled 64-bit library.
4. Repeat these steps for all Hadoop components that require native libraries (e.g., YARN, HDFS).

Detailed instructions for recompiling Hadoop on Ubuntu can be found at:

• http://www.ercoppa.org/Linux-Compile-Hadoop-220-fix-Unable-to-load-native-hadoop-library.htm

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