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To make things even more complicated, there's bin/run-all-tests.sh, which invokes run-tests.py (but also "mvn test" and the C++ tests), and buildall.sh, which invokes run-all-tests.sh.

Troubleshooting

1. Test failures due to missing libTestUdfs.so

E    MESSAGE: AnalysisException: Could not load binary: /test-warehouse/libTestUdfs.so
E   Failed to get file info hdfs://localhost:20500/test-warehouse/libTestUdfs.so
E   Error(2): No such file or directory

That file is created and uploaded by testdata/bin/copy-udfs-udas.sh. You can try 

testdata/bin/copy-udfs-udas.sh -build