Use a separate executor service for the concurrent Hive test #67
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This PR introduces a separate executor service for
HiveTablesTest$testConcurrentFastAppends.Right now, the test depends on the size of the worker pool. If the size is less 3, the test will not complete as the same worker pool is used in
SnapshotUpdate$apply(because manifest lists are now enabled and it requires at least one thread).The executor service does not use a custom
ThreadFactory. Threads will be non-daemon, but shouldn't be a problem as the result is wrapped intoMoreExecutors.getExitingExecutorService.