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Maven 3.9.x offers a new dependency resolver, HttpClient, which allows downloading project dependencies in parallel. This patch bumps the Maven version installed by bootstrap_system.sh to v3.9.2, and adds the flags enabling the new resolver to download dependencies (including POM files) in parallel. Parallelism is set to 10 threads. The flags are added to a project-specific Maven setting file in the newly created java/.mvn directory. The settings file is added to the RAT exclusion list in bin/rat_exclude_files.txt. The --show-version flag is added for debugging purposes. The same flags are added to the JAMM subproject as well. The new resolver in Maven 3.9 has also changed the warning message emitted for missing component checksums, so the new warning string is added to the filter in bin/mvn-quiet.sh Unfortunately Maven 3.9 has also changed the way it responds to missing checksum files: the resolver now emits a stack trace when checksums cannot be determined, and missing checksums are not explicitly ignored. Detailed documentation for the new Maven resolver in Maven 3.9.0+ is located at: https://maven.apache.org/guides/mini/guide-resolver-transport.html resolver configuration reference: https://maven.apache.org/resolver/configuration.html Tests: - verified in a core-mode test run with Maven 3.9.2 installed - verified in a local build using an earlier version of Maven to verify that the new default setting does not cause regressions with the old dependency resolver. Change-Id: I75d05215effc724f5bd471646fb352f37443e185 Reviewed-on: http://gerrit.cloudera.org:8080/20142 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Michael Smith <michael.smith@cloudera.com>