Minor Description
The new master started by TestSplitTransactionOnCluster#testMasterRestartWhenSplittingIsPartial will enable the CatalogJanitor. Hence, the parent region in SPLIT state will be removed by CatalogJanitor since all reference files of the parent region are removed by previous compaction.
branch-1.3+ aren't in this trouble since HBASE-13082 and HBASE-14970 make the compacted file be archived by a background thread. Before the thread cleans up the compacted files, the parent region in SPLIT state won't be removed as there are file is referenced by its daughter region.