AyWa opened a new pull request #3336: [ZEPPELIN-4078] Fix concurrent autocomplete and execute for Ipython URL: https://github.com/apache/zeppelin/pull/3336 ### What is this PR for? The pr is to fix a bug that will make the **ipython** `execute_interactive` hang forever if a auto `complete` call is make at the same time. (see unit test for example that is failing on master). For now the fix is to synchronize those method : `execute` / `complete`. It will not bring regression because anyway, the kernel does not support concurrent execute and auto complete (see https://github.com/jupyter/notebook/issues/3763) ### What type of PR is it? Bug Fix ### Todos * [x] - unit test failing in master / succeed on this branch * [x] - fix with lock ### What is the Jira issue? It is one part of the jira issue. Other fix will come soon https://issues.apache.org/jira/browse/ZEPPELIN-4078 ### How should this be tested? * First time? Setup Travis CI as described on https://zeppelin.apache.org/contribution/contributions.html#continuous-integration * Strongly recommended: add automated unit tests for any new or changed behavior * Outline any manual steps to test the PR here. ### 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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