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https://issues.apache.org/jira/browse/IMPALA-8529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved IMPALA-8529.
---------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 3.3.0

Seems this works now after we upgraded to CMake 3.14, even without changes to 
CMakeFiles (at least when I run ninja -v I see ccache in use)

> ccache is ignored when using ninja generator
> --------------------------------------------
>
>                 Key: IMPALA-8529
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8529
>             Project: IMPALA
>          Issue Type: Task
>            Reporter: Todd Lipcon
>            Priority: Major
>             Fix For: Impala 3.3.0
>
>
> The CMakeLists.txt sets up ccache by using RULE_LAUNCH_PREFIX, which is only 
> respected by the Makefile generator. So, if we use ninja (which is generally 
> better at parallelism) then ccache won't kick in. Newer versions of cmake 
> have more explicit support for ccache that ought to also work with the ninja 
> generator.



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