[ 
https://issues.apache.org/jira/browse/HADOOP-17891?focusedWorklogId=647663&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-647663
 ]

ASF GitHub Bot logged work on HADOOP-17891:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 08/Sep/21 02:04
            Start Date: 08/Sep/21 02:04
    Worklog Time Spent: 10m 
      Work Description: sunchao commented on pull request #3385:
URL: https://github.com/apache/hadoop/pull/3385#issuecomment-914820708


   @viirya hmm I think you can just reuse the `shadedclient` test case but just 
add one more test after the shaded test, e.g.:
   ```bash
     big_console_header "Checking client artifacts on ${repostatus} with shaded 
client"
   
     echo_and_redirect "${logfile}" \
       "${MAVEN}" "${MAVEN_ARGS[@]}" verify -fae --batch-mode -am \
         "${modules[@]}" \
         -Dtest=NoUnitTests -Dmaven.javadoc.skip=true -Dcheckstyle.skip=true 
-Dspotbugs.skip=true
   
     big_console_header "Checking client artifacts on ${repostatus} with 
non-shaded client"
   
     echo_and_redirect "${logfile}" \
       "${MAVEN}" "${MAVEN_ARGS[@]}" verify -fae --batch-mode -am \
         "${modules[@]}" \
         -Pnoshade -Dtest=NoUnitTests -Dmaven.javadoc.skip=true 
-Dcheckstyle.skip=true -Dspotbugs.skip=true
   ```
   


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 647663)
    Time Spent: 3h  (was: 2h 50m)

> 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
>            Reporter: L. C. Hsieh
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 3h
>  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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