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https://issues.apache.org/jira/browse/HADOOP-17891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17415242#comment-17415242
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Eric Badger commented on HADOOP-17891:
--------------------------------------
{noformat}
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.1:testCompile
(default-testCompile) on project hadoop-client-integration-tests: Compilation
failure: Compilation failure:
[ERROR]
/home/ebadger/apachehadoop/hadoop-client-modules/hadoop-client-integration-tests/src/test/java/org/apache/hadoop/example/ITUseHadoopCodecs.java:[34,28]
cannot find symbol
[ERROR] symbol: class RandomDatum
[ERROR] location: package org.apache.hadoop.io
[ERROR]
/home/ebadger/apachehadoop/hadoop-client-modules/hadoop-client-integration-tests/src/test/java/org/apache/hadoop/example/ITUseHadoopCodecs.java:[100,16]
package RandomDatum does not exist
[ERROR]
/home/ebadger/apachehadoop/hadoop-client-modules/hadoop-client-integration-tests/src/test/java/org/apache/hadoop/example/ITUseHadoopCodecs.java:[100,54]
package RandomDatum does not exist
[ERROR]
/home/ebadger/apachehadoop/hadoop-client-modules/hadoop-client-integration-tests/src/test/java/org/apache/hadoop/example/ITUseHadoopCodecs.java:[103,7]
cannot find symbol
[ERROR] symbol: class RandomDatum
[ERROR] location: class org.apache.hadoop.example.ITUseHadoopCodecs
[ERROR]
/home/ebadger/apachehadoop/hadoop-client-modules/hadoop-client-integration-tests/src/test/java/org/apache/hadoop/example/ITUseHadoopCodecs.java:[104,7]
cannot find symbol
[ERROR] symbol: class RandomDatum
[ERROR] location: class org.apache.hadoop.example.ITUseHadoopCodecs
{noformat}
[~viirya], this PR broke compilation for me on trunk. Reverting the patch
locally has allowed me to compile
> lz4-java and snappy-java should be excluded from relocation in shaded Hadoop
> libraries
> --------------------------------------------------------------------------------------
>
> Key: HADOOP-17891
> URL: https://issues.apache.org/jira/browse/HADOOP-17891
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.3.1
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.2
>
> Time Spent: 14h
> Remaining Estimate: 0h
>
> lz4-java is a provided dependency. So in the shaded Hadoop libraries, e.g.
> hadoop-client-api, if we don't exclude lz4 dependency, the downstream will
> still see the exception even they include lz4 dependency.
> {code:java}
> [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)
> {code}
> Currently snappy-java is included and relocated in Hadoop shaded client
> libraries. But as it includes native methods, it should not be relocated too
> due to JNI method resolution. The downstream will see the exception:
> {code}
> [info] Cause: java.lang.UnsatisfiedLinkError:
> org.apache.hadoop.shaded.org.xerial.snappy.SnappyNative.rawCompress(Ljava/nio/ByteBuffer;IILjava/nio/ByteBuffer;I)I
> [info] at
> org.apache.hadoop.shaded.org.xerial.snappy.SnappyNative.rawCompress(Native
> Method)
>
> [info] at
> org.apache.hadoop.shaded.org.xerial.snappy.Snappy.compress(Snappy.java:151)
>
>
> [info] at
> org.apache.hadoop.io.compress.snappy.SnappyCompressor.compressDirectBuf(SnappyCompressor.java:282)
> [info] at
> org.apache.hadoop.io.compress.snappy.SnappyCompressor.compress(SnappyCompressor.java:210)
> {code}
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