liuxunorg opened a new pull request #3322: [ZEPPELIN-4039] Fix restart interpreter process throws ConcurrentModificationException URL: https://github.com/apache/zeppelin/pull/3322 ### What is this PR for? 1. Set in zeppelin-env.sh `export ZEPPELIN_FORCE_STOP=true` 2. Create an interpreter process container in the remote YARN. 3. When restart this interpreter, The interpreter process container will have a ConcurrentModificationException and will not exit properly. The reason for this BUG is: When `export ZEPPELIN_FORCE_STOP=true`, Restart the interpreter process, the zeppelin server will execute the session that closes the process. At the same time, the `shutdown()` and `close()` will be remote call. In the RemoteInterpreterServer, the `shutdown()` and `close()` functions do not have concurrency control on the interpreterGroup, Causes an exception. ### What type of PR is it? [Bug Fix] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4039 ### How should this be tested? * Set in zeppelin-env.sh `export ZEPPELIN_FORCE_STOP=true` * Create an interpreter process container in the remote YARN. * Restart this interpreter. ### Screenshots (if appropriate)  [CI pass](https://travis-ci.org/liuxunorg/zeppelin/builds/503097844) ### 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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