2004-07-06 19:26:17 +00:00
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<html>
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<head>
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<title>LLADD Home Page</title>
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2004-10-27 01:40:09 +00:00
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<link href="site/lladd.css" title="normal-page" type="text/css" rel="Stylesheet" media="screen"></head>
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2004-07-06 19:26:17 +00:00
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</head>
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<body>
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2004-10-27 01:40:09 +00:00
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<div class="titlebar">
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<div class="pagename">
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LLADD - <small><i>(/yaahd/)</i></small> - Lightweight Library for Atomicity and Data Durability
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</div>
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</div>
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<p></p>
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<div class="sidebar">
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<div class="menu">
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<ul class="menusection">
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<li><a href="index.html">About</a></li>
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<li>Documentation</li>
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<ul class="menuitem">
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<li><a href="api/html/index.html">User Guide (API)</a></li>
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<li><a href="developers/html/index.html">Internals</a></li>
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2004-10-27 01:56:23 +00:00
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<!-- <li><a href="coverage/index.html">Unit Tests</a></li> -->
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2004-10-27 01:40:09 +00:00
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</ul>
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<li>Download</li>
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<ul class="menuitem">
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<li><a href="http://sourceforge.net/cvs/?group_id=121526">CVS</a></li>
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</ul>
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<li>Development</li>
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<ul class="menuitem">
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<li><a href="http://sourceforge.net/projects/lladd/">Sourceforge Site</a></li>
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</ul>
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</ul>
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</div>
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</div>
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<div class="mainbar">
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<div class="bodytext">
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<h1>Introduction</h1>
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2004-10-27 02:01:00 +00:00
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<p>LLADD is an extensible implementation of the ARIES algorithm, a
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2004-10-27 01:40:09 +00:00
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write-ahead-logging system that provides reliable transactional
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storage.</p>
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<p>Traditionally, write-ahead-logging schemes have been closely
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coupled to a relational database or other high-level system, making
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if difficult to make full use of their functionality without making
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significant changes to complex and tightly coupled code.</p>
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<p>LLADD allows application developers to make such changes easily,
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2004-10-27 03:49:02 +00:00
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by providing clean interfaces between its subsystems and by
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exporting enough of its functionality to application developers to
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allow custom, application-specific transactional storage
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mechanisms to be developed easily.</p>
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2004-07-06 19:26:17 +00:00
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2004-10-27 03:49:02 +00:00
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<h1>Features</h1>
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2004-10-27 01:40:09 +00:00
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<p>LLADD is still under heavy development, and we anticipate changes to
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a number of the API's that it exports. Here is a list of some of
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the features that we would like to include in the future.</p>
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2004-07-06 19:26:17 +00:00
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2004-10-27 01:40:09 +00:00
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<p>Implemented and in-progress features are marked with a
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"<sup>*</sup>":</p>
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<ul>
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<li>Extensibility</li>
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<ul>
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<li>Custom log entries<sup>*</sup></li>
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<li>Buffer manager API<sup>*</sup></li>
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<li>Page layout customization<sup>*</sup></li>
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<li>Collections of records<sup>*</sup></li>
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<li>Application specific locking policies</li>
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</ul>
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<li>Crash Recovery</li>
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<ul>
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<li>ARIES style Analysis/Full Redo/Partial Undo<sup>*</sup></li>
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<li>Fuzzy Checkpointing (for online backups)</li>
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<li>Log Truncation</li>
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</ul>
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<li>Storage features</li>
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<ul>
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<li>Storage of variable length records<sup>*</sup></li>
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<li>Expandable, on-disk arrays of records<sup>*</sup></li>
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<li>Linear Hash Table <sup>*</sup></li>
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<li>B-Tree indices</li>
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<li>Simple interface for definition of new storage mechanisms<sup>*</sup></sup></sub></li>
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</ul>
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<li>Concurrency</li>
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<ul>
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<li>Multi-Threaded<sup>*</sup></li>
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<li>Lock manager to allow transactions to run at varying degrees of consistency</li>
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<li>Networking support (for clusters of computers)</li>
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</ul>
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<li>Transactions</li>
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<ul>
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<li>Abort / Commit<sup>*</sup></li>
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<li>Prepare (for two phase commit implementations)<sup>*</sup></li>
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<li>Savepoints (To allow applications to partially rollback transactions)</li>
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</ul>
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</ul>
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<p>A design goal of our library is to avoid imposing any unnecessary
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structure upon the applications that make use of it. Therefore, the
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2004-10-27 03:49:02 +00:00
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storage structures listed above can be used as starting points
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for application specific storage mechanisms, although they are also
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2004-10-27 01:40:09 +00:00
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designed to be useful "out of the box".</p>
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</div>
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</div>
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<div class="version">
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<hr size="0">
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merge in changes from svn[r1572..r1601]
------------------------------------------------------------------------
r1601 | sears.russell@gmail.com | 2012-03-20 18:43:00 -0400 (Tue, 20
Mar 2012) | 1 line
commit bLSM bloom filter to stasis/util, which is where it really
belongs
------------------------------------------------------------------------
r1600 | sears.russell@gmail.com | 2012-03-04 01:58:38 -0500 (Sun, 04
Mar 2012) | 1 line
fix memory leak in skiplist unit test (now it is valgrind clean)
------------------------------------------------------------------------
r1599 | sears.russell@gmail.com | 2012-03-04 01:58:05 -0500 (Sun, 04
Mar 2012) | 1 line
fix typo in finalize type
------------------------------------------------------------------------
r1598 | sears.russell@gmail.com | 2012-03-04 00:59:59 -0500 (Sun, 04
Mar 2012) | 1 line
add comparator and finalizer parameters to skiplist constructor
------------------------------------------------------------------------
r1597 | sears.russell@gmail.com | 2012-03-03 18:23:16 -0500 (Sat, 03
Mar 2012) | 1 line
bugfixes for skiplist
------------------------------------------------------------------------
r1596 | sears.russell@gmail.com | 2012-03-02 15:05:07 -0500 (Fri, 02
Mar 2012) | 1 line
updated concurrentSkipList. Seeing strange crashes
------------------------------------------------------------------------
r1595 | sears.russell@gmail.com | 2012-03-01 16:51:59 -0500 (Thu, 01
Mar 2012) | 1 line
add progress reports
------------------------------------------------------------------------
r1594 | sears.russell@gmail.com | 2012-02-28 13:17:05 -0500 (Tue, 28
Feb 2012) | 1 line
experimental support for automatic logfile preallocation
------------------------------------------------------------------------
r1593 | sears.russell@gmail.com | 2012-02-28 12:10:01 -0500 (Tue, 28
Feb 2012) | 1 line
add histogram reporting to rawIOPS benchmark
------------------------------------------------------------------------
r1592 | sears.russell@gmail.com | 2012-02-24 16:31:36 -0500 (Fri, 24
Feb 2012) | 1 line
userspace raid 0 implementation
------------------------------------------------------------------------
r1591 | sears.russell@gmail.com | 2012-02-12 01:47:25 -0500 (Sun, 12
Feb 2012) | 1 line
add skiplist unit test, fix compile warnings
------------------------------------------------------------------------
r1590 | sears.russell@gmail.com | 2012-02-12 00:52:52 -0500 (Sun, 12
Feb 2012) | 1 line
fix compile error
------------------------------------------------------------------------
r1589 | sears.russell@gmail.com | 2012-02-12 00:50:21 -0500 (Sun, 12
Feb 2012) | 1 line
fix some bugs in hazard.h surrounding thread list management and
overruns of R under high contention
------------------------------------------------------------------------
r1588 | sears.russell@gmail.com | 2012-02-11 14:23:10 -0500 (Sat, 11
Feb 2012) | 1 line
add hazard pointer for get_lock. It was implicitly blowing away the
hazard pointer protecting y in the caller
------------------------------------------------------------------------
r1587 | sears.russell@gmail.com | 2012-02-10 18:51:25 -0500 (Fri, 10
Feb 2012) | 1 line
fix null pointer bug
------------------------------------------------------------------------
r1586 | sears.russell@gmail.com | 2012-02-10 18:03:39 -0500 (Fri, 10
Feb 2012) | 1 line
add simple refcounting scheme to concurrentSkipList. This solves the
problem where a deleted node points to another deleted node, and we
only have a hazard pointer for the first node.
------------------------------------------------------------------------
r1585 | sears.russell@gmail.com | 2012-02-10 14:19:14 -0500 (Fri, 10
Feb 2012) | 1 line
add hazard pointers for update using the smallest free slot first. The
old method left a race condition, since hazard_scan stops at the first
null pointer.
------------------------------------------------------------------------
r1584 | sears.russell@gmail.com | 2012-02-10 02:45:30 -0500 (Fri, 10
Feb 2012) | 1 line
add hazard pointers for update array
------------------------------------------------------------------------
r1583 | sears.russell@gmail.com | 2012-02-10 00:04:50 -0500 (Fri, 10
Feb 2012) | 1 line
skiplist update: concurrent, but broken
------------------------------------------------------------------------
r1582 | sears.russell@gmail.com | 2012-02-09 17:44:27 -0500 (Thu, 09
Feb 2012) | 1 line
skip list implementation. Not concurrent yet.
------------------------------------------------------------------------
r1581 | sears.russell@gmail.com | 2012-02-08 13:33:29 -0500 (Wed, 08
Feb 2012) | 1 line
Commit of a bunch of new, unused code: KISS random number generator,
Hazard Pointers, SUX latches (untested) and bit twiddling for
concurrent b-tree
------------------------------------------------------------------------
r1580 | sears.russell@gmail.com | 2012-01-17 19:17:37 -0500 (Tue, 17
Jan 2012) | 1 line
fix typo
------------------------------------------------------------------------
r1579 | sears.russell@gmail.com | 2012-01-11 18:33:31 -0500 (Wed, 11
Jan 2012) | 1 line
static build fixes for linux. hopefully these do not break macos...
------------------------------------------------------------------------
r1578 | sears.russell@gmail.com | 2012-01-09 19:13:34 -0500 (Mon, 09
Jan 2012) | 1 line
fix cmake under linux
------------------------------------------------------------------------
r1577 | sears.russell@gmail.com | 2012-01-09 18:37:15 -0500 (Mon, 09
Jan 2012) | 1 line
fix linux static binary compilation bugs
------------------------------------------------------------------------
r1576 | sears.russell | 2012-01-09 18:00:08 -0500 (Mon, 09 Jan 2012) |
1 line
port to macos x
------------------------------------------------------------------------
r1575 | sears.russell | 2012-01-09 17:39:43 -0500 (Mon, 09 Jan 2012) |
1 line
add missing _ from sync call name
------------------------------------------------------------------------
r1574 | sears.russell@gmail.com | 2012-01-09 14:26:31 -0500 (Mon, 09
Jan 2012) | 1 line
add -rt flag to static builds
------------------------------------------------------------------------
r1573 | sears.russell@gmail.com | 2011-12-20 23:38:29 -0500 (Tue, 20
Dec 2011) | 1 line
Simple makefile geared toward building libstasis.so and libstasis.a
(and nothing else)
------------------------------------------------------------------------
r1572 | sears.russell@gmail.com | 2011-12-20 22:37:54 -0500 (Tue, 20
Dec 2011) | 1 line
add some missing #include<config.h> lines
2012-04-21 16:52:31 +00:00
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<small><i>$Id: index.html 96 2004-10-27 03:49:02Z sears $</i></small>
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2004-10-27 01:40:09 +00:00
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</div>
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2004-07-06 19:26:17 +00:00
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</body>
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</html>
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