Reamer opened a new pull request #3718: [ZEPPELIN-4727] Fix HDFS Credentials storage URL: https://github.com/apache/zeppelin/pull/3718 ### What is this PR for? With this PR we are switching to the abstract class `ConfigStorage` to save/load Credentials. We have child classes of `ConfigStorage` which are able to save to disc or HDFS. NOTE: Cluster communication with changed user credentials is very simple. The `credential.json` content change is the only communication between cluster members. This leads to many rereads. ### What type of PR is it? Bug Fix ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4727 ### How should this be tested? * **Travis-CI**: https://travis-ci.org/github/Reamer/zeppelin/builds/671605072 ### 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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