default void postFlush(ObserverContext<? extends RegionCoprocessorEnvironment> c, Store store,
    StoreFile resultFile, FlushLifeCycleTracker tracker) throws IOException {
  }
Called after a Store's memstore is flushed to disk.
@param c          the environment provided by the region server
@param store      the store being flushed
@param resultFile the new store file written out during compaction
@param tracker    tracker used to track the life cycle of a flush
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java