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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,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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
 - Haskell
 https://github.com/wuxb45/HandlerSocket-Haskell-Client
The home of HandlerSocket is here:
 https://github.com/DeNA/HandlerSocket-Plugin-for-MySQL
More documents are available in docs-en/ and docs-ja/ directories.