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(Updated May 4, 2016, 12:30 a.m.) Review request for samza, Boris Shkolnik, Navina Ramesh, Jagadish Venkatraman, and Yi Pan (Data Infrastructure). Bugs: SAMZA-943 https://issues.apache.org/jira/browse/SAMZA-943 Repository: samza Description ------- SAMZA-943 Occasional test failure: TestStreamPartitionCountMonitor.testStartStopBehavior * Rewrote the monitor in Java following the pattern of the PollingScanDiskSpaceMonitor in SAMZA-924 ** The main difference is that it uses a ScheduledExecutorService to cleanly run the monitor in a loop and provide determinism around startup and shutdown * Got rid of the sleep() in the unit test * Added a unit test to verify the scheduler calls the monitor method * Enforced that the monitor isn't restarted (which is a problem for the scheduler service) ** This required that the reference to the monitor not be static (defined in the JobCoordinator object) and instead instantiated whenever the JobCoordinator is instantiated. Diffs (updated) ----- checkstyle/import-control.xml c15b8e74de8e5aac5ac83278c52ab3dba1630e50 samza-core/src/main/java/org/apache/samza/coordinator/StreamPartitionCountMonitor.java PRE-CREATION samza-core/src/main/scala/org/apache/samza/coordinator/JobCoordinator.scala 384b2e777c73fc1e4bc8a29312c9ea5372162ca1 samza-core/src/main/scala/org/apache/samza/coordinator/StreamPartitionCountMonitor.scala 6aeff5787a0018ca2cae7d901c25537fbc7dea23 samza-core/src/test/scala/org/apache/samza/coordinator/TestStreamPartitionCountMonitor.scala f47f8189bd92c4071ae76ae323e066823f3a6f61 Diff: https://reviews.apache.org/r/46856/diff/ Testing ------- Added a test. Ran check-all.sh Thanks, Jake Maes