pitrou commented on code in PR #13379:
URL: https://github.com/apache/arrow/pull/13379#discussion_r898873593


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ci/scripts/ccache_setup.sh:
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@@ -23,4 +23,4 @@ echo "ARROW_USE_CCACHE=ON" >> $GITHUB_ENV
 echo "CCACHE_COMPILERCHECK=content" >> $GITHUB_ENV
 echo "CCACHE_COMPRESS=1" >> $GITHUB_ENV
 echo "CCACHE_COMPRESSLEVEL=6" >> $GITHUB_ENV
-echo "CCACHE_MAXSIZE=500M" >> $GITHUB_ENV
+echo "CCACHE_MAXSIZE=2G" >> $GITHUB_ENV

Review Comment:
   > We seem to have 80G of cache capacity, so we could use some big max-size 
like 20G _BUT_ due to the `actions/cache` issue this would almost guarantee 
that any less used non-ccache caches would be evicted very quickly.
   
   Right. What I'm saying is that, due to the number of builds, we may already 
have this issue with a 2 GB max-size, so we should start with 1 GB.



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