HBASE-24150 Allow module tests run in parallel (#1464)

Pass --threads=2 to mvn when yetus runs so some parallelism
when dependencies allow.

Signed-off-by: Nick Dimiduk <ndimiduk@apache.org>
Signed-off-by: Viraj Jasani <vjasani@apache.org>

dev-support/hbase-personality.sh

@@ -137,7 +137,10 @@ function personality_modules
 
   clear_personality_queue
 
-  extra="-DHBasePatchProcess"
+  # At a few points, hbase modules can run build, test, etc. in parallel
+  # Let it happen. Means we'll use more CPU but should be for short bursts.
+  # https://cwiki.apache.org/confluence/display/MAVEN/Parallel+builds+in+Maven+3
+  extra="--threads=2 -DHBasePatchProcess"
   if [[ "${PATCH_BRANCH}" = branch-1* ]]; then
     extra="${extra} -Dhttps.protocols=TLSv1.2"
   fi

dev-support/hbase_nightly_source-artifact.sh

@@ -172,7 +172,7 @@ fi
 
 cd "${unpack_dir}"
 echo "Follow the ref guide section on making a RC: Step 8 Build the binary tarball."
-if mvn -DskipTests -Prelease --batch-mode -Dmaven.repo.local="${m2_tarbuild}" clean install \
+if mvn --threads=2 -DskipTests -Prelease --batch-mode -Dmaven.repo.local="${m2_tarbuild}" clean install \
     assembly:single >"${working_dir}/srctarball_install.log" 2>&1; then
   for artifact in "${unpack_dir}"/hbase-assembly/target/hbase-*-bin.tar.gz; do
     if [ -f "${artifact}" ]; then