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https://issues.apache.org/jira/browse/HADOOP-17891?focusedWorklogId=648403&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-648403
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ASF GitHub Bot logged work on HADOOP-17891:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 09/Sep/21 06:10
Start Date: 09/Sep/21 06:10
Worklog Time Spent: 10m
Work Description: viirya commented on a change in pull request #3385:
URL: https://github.com/apache/hadoop/pull/3385#discussion_r704994380
##########
File path: hadoop-client-modules/hadoop-client-integration-tests/pom.xml
##########
@@ -57,6 +57,11 @@
<artifactId>lz4-java</artifactId>
<scope>test</scope>
</dependency>
+ <dependency>
+ <groupId>org.xerial.snappy</groupId>
+ <artifactId>snappy-java</artifactId>
+ <scope>test</scope>
Review comment:
Because we exclude it from the uber jar, we don't include the artifact
of snappy-java in client libraries like hadoop-client-runtime. Note that both
hadoop-client-runtime and hadoop-client-api make hadoop-client as optional. So
it won't count hadoop-client as transitive dependency of these client libraries.
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Issue Time Tracking
-------------------
Worklog Id: (was: 648403)
Time Spent: 10h 20m (was: 10h 10m)
> 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: 10h 20m
> 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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