public boolean queueIncrement(TIncrement inc) {
    if (!canQueue()) {
      failedIncrements.increment();
      return false;
    }
    return internalQueueTincrement(inc);
  }
Used to identify a cell that will be incremented.
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/IncrementCoalescer.java