private void startHeapMemoryManager() {
    if (this.blockCache != null) {
      this.hMemManager =
        new HeapMemoryManager(this.blockCache, this.cacheFlusher, this, regionServerAccounting);
      this.hMemManager.start(getChoreService());
    }
  }
Run init. Sets up wal and starts up all server threads.
@param c Extra configuration.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java