Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/15553
Thanks for the link to 'skip' - will test it out !
About test compilation :
For example, in common/network-shuffle/pom.xml, we have
```
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-network-common_${scala.binary.version}</artifactId>
<version>${project.version}</version>
<type>test-jar</type>
<scope>test</scope>
</dependency>
```
Since we are skipping compilation of test classes via maven's
maven.test.skip=true , the testjar is never build - which causes the subsequent
resolution in network-shuffle to fail since, the resolution of artifacts is not
related to these flags (so even if test compile is disabled, the artifacts will
still be resolved).
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