private int getHandlerCount(Configuration conf) {
    int handlerCount = conf.getInt("hbase.hstore.flusher.count", 2);
    if (handlerCount < 1) {
      LOG.warn(
        "hbase.hstore.flusher.count was configed to {} which is less than 1, " + "corrected to 1",
        handlerCount);
      handlerCount = 1;
    }
    return handlerCount;
  }
@param when When to expire, when to come up out of the queue. Specify in milliseconds. This
            method adds EnvironmentEdgeManager.currentTime() to whatever you pass.
@return This.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java