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IMPALA-13279 upgraded gcovr to 7.2 and moved it from python 2 to python 3.8. gcovr has several dependencies that require native compilation, and this increased the cost of initializing the Python 3 virtualenv substantially: Without gcovr: 1m43.279s With gcovr and deps: 6m35.107s This moves gcovr to its own requirements file and only installs gcovr if this is a coverage build (detected from the .cmake_buid_type file). Testing: - Verified that a coverage build does install gcovr and produce a report Change-Id: I1d0fd6d21273053aaf2acee39fcb83d9093d49a2 Reviewed-on: http://gerrit.cloudera.org:8080/21849 Reviewed-by: Laszlo Gaal <laszlo.gaal@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
To install new packages: 1) Add your package to deps/requirements.txt, or deps/compiled-requirements.txt if the the package needs a C/C++ compiler to build . You should specify the version number using the "foo == x.y.z" notation so future upgrades can be done automatically. 2) Run deps/download_requirements, it will download the package to the deps dir. 3) Run the "impala-python" command, this should detect that requirements.txt changed and automatically rebuild the virtualenv. 4) Now in the python prompt, you should be able to import the new module. To upgrade a package: 1) Edit deps/requirement.txt to use the version you need. 2) Go to step 2 above.