记录Hadoop native libraries无法load的问题

今天遇到一个错误，在本地往Hadoop写文件的时候报了一个错误:

SequenceFile doesn't work with GzipCodec without native-hadoop code!

SequenceFile有个判断会抛出这个exception

 private static Writer
    createWriter(Configuration conf, FSDataOutputStream out, 
                 Class keyClass, Class valClass, boolean compress, boolean blockCompress,
                 CompressionCodec codec, Metadata metadata)
    throws IOException {
    if (codec != null && (codec instanceof GzipCodec) && 
        !NativeCodeLoader.isNativeCodeLoaded() && 
        !ZlibFactory.isNativeZlibLoaded(conf)) {
      throw new IllegalArgumentException("SequenceFile doesn't work with " +
                                         "GzipCodec without native-hadoop code!");
    }

通过这段代码可以测试这个错误。

import org.apache.hadoop.io.compress.zlib.ZlibCompressor;

public class MyTester {

	public static void main(String[] args) {
		new ZlibCompressor();
	}
}

如何避免？

有两种解决方案：

1. 把hadoop.native.lib设置为false

2. 把/duitang/dist/sys/hadoop-1.2.1/lib/native/Linux-amd64-64/*下的so文件copy到/duitang/dist/sys/java/jre/lib/amd64