Hadoop Native Library Loading Error: Ignore or Recompile?

Hadoop Library Loading Error: Resolving "Unable to Load Native-Hadoop Library" Warning

When executing Hadoop commands like start-dfs.sh or stop-dfs.sh, a user may encounter the warning:

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

This issue arises due to a mismatch between the Hadoop native library and the platform's architecture. In the case of CentOS, the native library included in Hadoop 2.2.0 was likely compiled for a 32-bit system, while your server is running a 64-bit version of CentOS.

To address this warning, one can opt for two courses of action:

1. Ignore the Warning:
   The warning poses no critical impact on Hadoop's functionality and can be ignored without affecting its operations.

2. Recompile the Native Library:
   To eliminate the warning, you can recompile the Hadoop source code to generate a native library specifically for your 64-bit CentOS system. Detailed instructions on how to do this can be found at the following link:

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

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