JingGe commented on a change in pull request #17458:
URL: https://github.com/apache/flink/pull/17458#discussion_r727793607



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File path: docs/content/docs/flinkDev/building.md
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@@ -52,11 +52,19 @@ mvn clean install -DskipTests
 
 This instructs [Maven](http://maven.apache.org) (`mvn`) to first remove all 
existing builds (`clean`) and then create a new Flink binary (`install`).
 
-To speed up the build you can skip tests, QA plugins, and JavaDocs:
+To speed up the build you can:
+- use the build-in "fast" maven profile which will skip unit tests, 
integration tests, QA plugins, and JavaDocs.
+- active maven parallel build, e.g. "mvn -T 1C" means 1 thread per cpu core.
 
+The build script will be:
 ```bash
-mvn clean install -DskipTests -Dfast
+mvn clean install -DskipTests -Dfast -T 1C

Review comment:
       Your consideration is great! Thanks. I would suggest to point out the 
risk in the documentation and let user make the choice, since on one hand I did 
not find any another place that is better to tell people who do know maven 
about this improvement hint and on the other hand info about building Flink 
should be kept at one place for people with different background.




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