zjffdu opened a new pull request #3346: [ZEPPELIN-4066]. Introduce ProcessLauncher to encapsulate process launch URL: https://github.com/apache/zeppelin/pull/3346 ### What is this PR for? This PR introduce ProcessLauncher to encapsulate process launch. ProcessLauncher will do most of the process launching stuff but also allow for customization. E.g. how to check the process is started properly. And when error happens, ProcessLauncher will capture the necessary error output for further diagnose. ### What type of PR is it? [ Improvement | Refactoring] ### Todos * [ ] - Task ### What is the Jira issue? * https://jira.apache.org/jira/browse/ZEPPELIN-4066 ### How should this be tested? * Ci pass ### 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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