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See Tips for Faster Impala Builds for more tips on how to do incremental builds.
FAQ
Q: The build is stuck at 100% progress for a while (as the screenshot shows). What's going on there?
A: Usually the FE compilation is still running. Maven downloads a lot of artifacts. So you will see slow progress there if your internet connection is slow. You can check the logs at ${IMPALA_HOME}/logs/mvn/mvn.log