bkmgit commented on a change in pull request #11205:
URL: https://github.com/apache/arrow/pull/11205#discussion_r741627611



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File path: docs/source/developers/cpp/building.rst
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@@ -41,6 +41,9 @@ Building requires:
   sufficient. For Windows, at least Visual Studio 2017 is required.
 * CMake 3.5 or higher
 * On Linux and macOS, either ``make`` or ``ninja`` build utilities
+* At least 1GB of RAM for a minimal build, 4GB for a minimal  
+  debug build with tests and 8GB for a full build using
+  :ref:`docker <docker>`.

Review comment:
       This is helpful. It seems that about 8GB is what is needed for most 
options, but that one can often use less. VM's with 1GB are significantly 
cheaper than VMs with 8GB 




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