viirya opened a new pull request #3385:
URL: https://github.com/apache/hadoop/pull/3385
Lz4 is a provided dependency. So in the shaded Hadoop libraries, e.g.
hadoop-client-api, if we don't exclude lz4 dependency from relocation, the
downstream will still see the exception even they include lz4 dependency.
```
[info] Cause: java.lang.ClassNotFoundException:
org.apache.hadoop.shaded.net.jpountz.lz4.LZ4Factory
[info] at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
[info] at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
[info] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
[info] at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
[info] at
org.apache.hadoop.io.compress.lz4.Lz4Compressor.<init>(Lz4Compressor.java:66)
[info] at
org.apache.hadoop.io.compress.Lz4Codec.createCompressor(Lz4Codec.java:119)
[info] at
org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:152)
[info] at
org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:168)
```
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