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Impala 4 moved to using CDP versions for components, which involves adopting Hive 3. This removes the old code supporting CDH components and Hive 2. Specifically, it does the following: 1. Remove USE_CDP_HIVE and default to the values from USE_CDP_HIVE=true. USE_CDP_HIVE now has no effect on the Impala environment. This also means that bin/jenkins/build-all-flag-combinations.sh no longer include USE_CDP_HIVE=false as a configuration. 2. Remove USE_CDH_KUDU and default to getting Impala from the native toolchain. 3. Ban IMPALA_HIVE_MAJOR_VERSION<3 and remove related code, including the IMPALA_HIVE_MAJOR_VERSION=2 maven profile in fe/pom.xml. There is a fair amount of code that still references the Hive major version. Upstream Hive is now working on Hive 4, so there is a high likelihood that we'll need some code to deal with that transition. This leaves some code (such as maven profiles) and test logic in place. Change-Id: Id85e849beaf4e19dda4092874185462abd2ec608 Reviewed-on: http://gerrit.cloudera.org:8080/15869 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>