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

Unable to Load Native Hadoop Library: Resolving the Warning

When configuring Hadoop on CentOS, users may encounter the following warning upon 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 stems from a discrepancy between the compiled architecture of the native Hadoop library, libhadoop.so.1.0.0, and the host system's architecture. Typically, this issue occurs when the library was compiled on a 32-bit system but is being used on a 64-bit system.

While the warning does not affect Hadoop's functionality, it can be eliminated by recompiling libhadoop.so.1.0.0 on a 64-bit system. To do so, download the Hadoop source code, navigate to the native directory, and execute:

make clean
make native

Once recompiled, replace the existing 32-bit libhadoop.so.1.0.0 with the newly compiled 64-bit version. By following these steps, the warning should be resolved and Hadoop can operate optimally.

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