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HandlerSocket plugin for MySQL

Copyright (c) 2010 DeNA Co.,Ltd.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of DeNA Co.,Ltd. nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY DeNA Co.,Ltd. "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL DeNA Co.,Ltd. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


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About HandlerSocket

HandlerSocket is a NoSQL plugin for MySQL. It works as a daemon inside the
mysqld process, accept tcp connections, and execute requests from clients.
HandlerSocket does not support SQL queries. Instead, it supports simple CRUD
operations on tables.

Because of the following reasons, HandlerSocket is much faster than the
mysqld/libmysql pair in some circumstances:

  - HandlerSocket manipulates data without parsing SQL, which causes less
    CPU usage.
  - HandlerSocket reads many requests from clients and executes their
    requests in bulk, which causes less CPU and disk usage.
  - HandlerSocket client/server protocol is more compact than the 
    mysql/libmysql pair, which causes less network usage.

The current version of HandlerSocket only works with GNU/Linux. The source
archive of HandlerSocket includes a C++ and a Perl client libraries.
Here is a list of client libraries for other languages:

  - PHP
    http://openpear.org/package/Net_HandlerSocket
    http://github.com/tz-lom/HSPHP
    http://code.google.com/p/php-handlersocket/
  - Java
    http://code.google.com/p/hs4j/
    http://code.google.com/p/handlersocketforjava/
  - Python
    http://pypi.python.org/pypi/python-handler-socket
    https://code.launchpad.net/~songofacandy/+junk/pyhandlersocket
  - Ruby
    https://github.com/winebarrel/ruby-handlersocket
    https://github.com/miyucy/handlersocket
  - JavaScript
    https://github.com/koichik/node-handlersocket
  - Scala
    https://github.com/fujohnwang/hs2client

The home of HandlerSocket is here:
    https://github.com/ahiguti/HandlerSocket-Plugin-for-MySQL

More documents are available in docs-en/ and docs-ja/ directories.