Regarding: org.onap.cps.spi.impl.CpsDataPersistenceServiceImpl#deleteDataNodes(java.lang.String, java.lang.String, java.util.Collection<java.lang.String>)

The plural deleteDataNodes method is faster at deleting even individual data nodes than singular deleteDataNode. It should be changed so that deleteDataNode calls deleteDataNodes with a singletonList(xpath). Much complex code for individual deletion can then be removed.

However, some consideration is required on how to handle methods such as deleteListDataNode.