RRDTOOL NEWS
============
+#####################################
+Major Changes between 1.2.x and 1.3.x
+-------------------------------------
-In this file I am noting the Major changes to rrdtool
-for details check the cvs ChangeLog
-
-2002/03/26 Peter Speck <speck@ruc.dk>
- Contribution of an svg output routine for the new gfx graphing part
-
-2002/03/23 Alex van den Bogaerdt <alex@ergens.op.Het.Net>
- Several visible changes made to rrd_graph
- * Pie chart support workable
- * Elements that are not used do not take up space on the img
- * Hack for the missing rotated text (see --vertical-label)
- * Tiny boxes in front of labels now scale with the text
-
-2002/01/15 Tobias Oetiker <tobi@oetiker.ch>
- The BIG graph update
- * Replace libgd with libart
- * Added freetype
- * Updated zlib and libpng
- * rrd_gfx.c intrduced as libart wrapper
- * LINE takes now a float as argument
- * rrdtool uses truetype for fonts
- * thanks to libart there is now full alpha transparenc
- and antialiasing.
- * the new option --font lets customize the font
- and size for various graph elements
- * Updated to -> libtool 1.4.2 automake 2.12 autoconf 2.52
- * new --zoom commandline option for zoom ans shrinking
- ---- Still missing is rotatet text for the yaxis description
- ---- Still missing is tab support in the text rendere
- ---- Still missing is autoconf support for a default truetype font
-
-2001/07/26 Alex van den Bogaerdt <alex@ergens.op.Het.Net>
- Added TOTAL to the VDEF functions.
-
-2001/07/19 Alex van den Bogaerdt <alex@ergens.op.Het.Net>
- VDEF support. This is a variable containing one value
- and a time component. This type of variable can hold
- the result of a function over a complete time series
- of data (DEF or CDEF) such as the maximum seen, and when.
-
-2001/03/10 Jake Brutlag <jakeb@corp.webtv.net>
- Support for COMPUTE data sources (CDEF data sources). Removes the RPN
- parser and calculator from rrd_graph and puts then in a new file,
- rrd_rpncalc.c. Changes to core files rrd_create and rrd_update. Some
- clean-up of aberrant behavior stuff, including a bug fix.
- Documentation update (rrdcreate.pod, rrdupdate.pod). Change xml format.
-
-2001/03/07 Tobias Oetiker <oetiker@ee.ethz.ch>
- Integrated complete rewrite
- of rrdgraph documentation by Alex van den Bogaerdt
- <alex@ergens.op.Het.Net>. This also contains info on his planned
- changes to the rrdgraph module
-
-2001/03/02 Tobias Oetiker <oetiker@ee.ethz.ch>
- Added Aberrant Patch from Jake Brutlag <jakeb@microsoft.com>
- From now one, new rrd files use version tag 0002. They can
- NOT be read by the old 1.0.x rrdtools.
+NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
+----------------------------
+* introduced file-accessor functions rrd_read/rrd_seek/rrd_write
+
+* implemented full mmap-based file access with madvise hints for
+ improved scalability, much reduced memory-footprint and much less
+ blocking while accessing the disk
+
+* implemented optional full file-descriptor access instead of FILE*
+ access
+
+NEW Graphing (Tobi Oetiker)
+------------
+* libart has been replaced by cairo/pango
+
+* pango markup is supported (--pango-markup)
+
+* full grid fitting
+
+* --graph-render-mode=mono for non anti aliased graphing
+
+* --font-render-mode=mono for non anti aliased fonts
+
+* fonts come through fontconfig, use the Pango font nameing scheme
+ -> 'Times 20' ... it is not possible to use truetype fonts
+ directly anymore.
+
+* Tabs are position independent.
+
+* TRENDNAN filter that ignores NAN values while calculating the
+ TREND data. (Timo Stripf)
+
+* --full-size-mode to specify the outer border of the image and not
+ just of the graphing canvas (Matthew Chambers)
+
+* TEXTALIGN command to alter default text alignment behavior
+
+* C API in-memory graphing with rrd_graph_v (Evan Miller)
+
+* draw dashed lines in graphs (Thomas Gutzler)
+
+* new interface graphv which returns information using the rrd_info
+ interface (Tobi Oetiker and Mark Plaksin)
+
+* improved horizontal grid. Have a bit more grid lines and y-axis
+ labels while keeping them far enough apart to not run into each
+ other.
+
+NEW Forecasting (Evan Miller)
+---------------
+* the new MHWPREDICT consolidation function uses a variation of the
+ Holt-Winters method. It is a drop-in replacement for HWPREDICT,
+ and is better suited for data whose seasonal variations grow or
+ shrink in proportion to the average.
+
+* If you create an RRD with the new MHWPREDICT function, the
+ resulting rrd file will be version 0004 and can only be used in
+ rrdtool 1.3.
+
+Rewrites
+--------
+* rrd_restore now uses libxml for parsing which makes things much
+ more tolerant towards xml variations. The old code could mostly
+ just parse the XML as it was output by rrdtool dump. See also:
+ the note at the bottom of this document. (by Florian octo
+ Forster)
+
+* rrd_update rewritten to make it more modular. Fixed two
+ longstanding HW bugs in the process (Evan Miller)
+
+Internationalization (Takao Fujiwara and Tobi Oetiker)
+--------------------
+* The help output by rrdtool has been internationalized. There are
+ no real translations included with rrdtool yet, contributions are
+ welcome.
+
+* The internationalization will only be compiled if libintl and
+ friends are available on your system. Use the configure option
+ --disable-libintl if you want to disable this feature
+
+Language Bindings
+-----------------
+* ruby rrd_fetch will return step as a last property -- Mike Perham
+
+RRDtool dump / restore incompatibility
+--------------------------------------
+* rrdtool dump 1.3 does emit completely legal XML. Basically this
+ means that it contains an XML header and a DOCTYPE definition.
+ Unfortunately this causes older versions of rrdtool restore to be
+ unhappy.
+
+* To restore a new dump with an old rrdtool restore version, either
+ remove the XML header and the doctype by hand (both on the first
+ line of the dump) or use rrdtool dump --no-header.
+
+
+######################################################################################
+Major Changes between 1.0.x and 1.2.x
+======================================================================================
+Graphing
+--------
+
+* rewritten graphics generation based on libart.
+ - anti-aliased output
+ - alpha transparency support
+ - truetype fonts
- Jake:
- Aberrant Behavior Detection support. A brief overview added to
- rrdtool.pod. Major updates to rrd_update.c, rrd_create.c. Minor update to
- other core files. Updated documentation: rrdcreate.pod, rrdgraph.pod,
- rrdtune.pod. This is backwards compatible (i.e. new tool can read and will
- leave the binary header unchanged for old files).
- See http://cricket.sourceforge.net/aberrant/rrd_hw.htm
+* additional graphics formats: EPS, PDF, SVG
+
+* extended multi-part documentation
+
+* VDEF support; define and use variables. Find, and use, the
+ maximum rate seen by rrdtool; compute and show the average
+
+* Sliding window (trend) analysis
+ Compute a smoother average, for instance over the last 6 CDPs
+
+* percentile (95th or other)
+ Remove peaks, 95 percent of all rates are at or below the
+ returned value
+
+Logging
+-------
+* a second logging interface: rrdtool updatev
+ Verbose updating of the database; show CPDs being created
+
+* Aberrant Behavior Detection with Holt-Winters Forecasting
+ Compare current data with expected data, detect and log when
+ the rates are outside expected levels
+
+* COMPUTE data type for artificial data-sources calculating their
+ input using RPN math and data from the other data-sources.
+
+Incompatibilities
+-----------------
+* Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
+
+* the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
+ without functionality.
+
+* In pipe mode, rrdtool answers with OK only if it was successful with the
+ command. Otherwhise the answer will be ERROR...
+
+
+Behind the Scenes
+-----------------
+* In order to support Holt-Winters and Calculated Datasources,
+ the rrdtool data format has changed. While the new version of rrdtool can
+ read files created with rrdtool 1.0.x. It is not possible to read files
+ created by rrdtool-1.2.x with rrdtool-1.0.x
+
+* External libraries are not included with rrdtool anymore. This is in line
+ with todays trend of using shared libraries everywhere. With the exception
+ of the cgi library most things required by rrdtool will be found on every recent
+ system.
+
+* Memory Mapped IO support for faster logging.
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