public final void transitionWriteItem() {
    Operation op = removeCurrentWriteOp();
    assert op != null : "There is no write item to transition";
    getLogger().debug("Finished writing %s", op);
  }
Represents a node with the memcached cluster, along with buffering and
operation queues.
src/main/java/net/spy/memcached/protocol/TCPMemcachedNodeImpl.java