bharathv commented on issue #1039: HBASE-23647: Make MasterRegistry the default impl. URL: https://github.com/apache/hbase/pull/1039#issuecomment-577427617 Reposting from the jira comment: @apurtell TestFromClientSide was known to be flaky (even before this patch). So I'm fairly certain it has nothing to do with the current jira. One thing @ndimiduk and I noticed here is that switching to JUnit 4.13 (HBASE-23664) has exacerbated the problem. Based on some initial debugging it looks like it has something to do with leaking FileSystem/DFSClient objects in the HBase code and restarting the minicluster in the same JUnit test runner JVM (what TestFromClientSide does) causes a leak of hdfs lease renewer threads. Some how Junit 4.12 was masking the problem.
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