build_and_run.sh

# build
javac -cp '/usr/share/druid/hadoop-dependencies/hadoop-client/2.6.0/*' SnappyNativeTest.java  && jar -cf SnappyNativeTest.jar SnappyNativeTest.class

# run without LD_LIBRARY_PATH
java -cp /usr/share/druid/lib/*:/usr/share/druid/extensions/druid-hdfs-storage/*:/usr/share/druid/hadoop-dependencies/hadoop-client/2.6.0/*:SnappyNativeTest.jar SnappyNativeTest

java.library.path = /usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
:( native hadoop NOT manually loaded: java.lang.UnsatisfiedLinkError: no hadoop in java.library.path
:( native snappy NOT manually loaded: java.lang.UnsatisfiedLinkError: no snappy in java.library.path
2016-05-23T18:41:23,813 WARN [main] org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
:( native hadoop NOT loaded according to Hadoop
Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCodeLoader.buildSupportsSnappy()Z
	at org.apache.hadoop.util.NativeCodeLoader.buildSupportsSnappy(Native Method)
	at SnappyNativeTest.main(SnappyNativeTest.java:40)


ls /usr/lib/hadoop/lib/native
libhadoop.a  libhadooppipes.a  libhadoop.so  libhadoop.so.1.0.0  libhadooputils.a  libhdfs.a  libnativetask.a  libnativetask.so  libnativetask.so.1.0.0  libsnappy.a  libsnappy.so  libsnappy.so.1  libsnappy.so.1.1.3

# run with LD_LIBRARY_PATH
LD_LIBRARY_PATH=/usr/lib/hadoop/lib/native java -cp /usr/share/druid/lib/*:/usr/share/druid/extensions/druid-hdfs-storage/*:/usr/share/druid/hadoop-dependencies/hadoop-client/2.6.0/*:SnappyNativeTest.jar SnappyNativeTest

java.library.path = /usr/lib/hadoop/lib/native:/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
:) native hadoop manually loaded
:) native snappy manually loaded
:) native hadoop loaded according to Hadoop
:) native snappy loaded according to Hadoop
:) native snappy loaded according to Hadoop SnappyCodec

SnappyNativeTest.java

import java.util.Enumeration;
import java.util.Properties;
import org.apache.hadoop.util.NativeCodeLoader;
import org.apache.hadoop.io.compress.SnappyCodec;

public class SnappyNativeTest
{ 
    public static void main(String [] args)
    {
        System.out.println("java.library.path = " + System.getProperty("java.library.path"));

        // Try to manually load hadoop native
        try {
            System.loadLibrary("hadoop");
            System.out.println(":) native hadoop manually loaded");
        } catch (Throwable t) {
            System.out.println(":( native hadoop NOT manually loaded: " + t);
        }


        // Try to manually load snappy native
        try {
            System.loadLibrary("snappy");
            System.out.println(":) native snappy manually loaded");
        } catch (UnsatisfiedLinkError ex) {
            System.out.println(":( native snappy NOT manually loaded: " + ex.toString());
        }


        // Check if Hadoop thinks hadoop native is loaded
        if (NativeCodeLoader.isNativeCodeLoaded()) {
            System.out.println(":) native hadoop loaded according to Hadoop");
        }
        else {
            System.out.println(":( native hadoop NOT loaded according to Hadoop");
        }


        // Check if Hadoop thinks snappy native is loaded
        if (NativeCodeLoader.buildSupportsSnappy()) {
            System.out.println(":) native snappy loaded according to Hadoop");
        }
        else {
            System.out.println(":( native snappy NOT loaded according to Hadoop");
        }


        // Check if Hadoop SnappyCodec thinks snappy native is loaded.
        // This will throw if it is not
        SnappyCodec.checkNativeCodeLoaded();
        System.out.println(":) native snappy loaded according to Hadoop SnappyCodec");
    }
}