zjffdu opened a new pull request #3520: [ZEPPELIN-4443]. Unclear message when R is not installed URL: https://github.com/apache/zeppelin/pull/3520 ### What is this PR for? This PR utilize ProcessLauncher to launch R process and capture the error output when it fails to launch R process. ### What type of PR is it? [Improvement ] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4443 ### How should this be tested? * Unit test is added ### Screenshots (if appropriate) ### Questions: * Does the licenses files need update? No * Is there breaking changes for older versions? No * Does this needs documentation? No
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