6648d63c9561a76e307651e8ada0fa2b24ec1a64
1 #####################################
2 Major Changes between 1.3.x and 1.4.x
3 -------------------------------------
4 $Id$
6 RRD Caching Daemon (rrdcached)
7 ------------------------------
8 by Florian Forster and Kevin Brintnall
10 The RRD Caching Daemon can dramatically improve the 'update' performance
11 of your system. Due to file handling overheads, the time it takes todo one
12 update is virtually the same as to doing two updates in a row.
14 The Cache Daemon intercepts rrdtool update calls, assembling multiple
15 updates before writing them to the actual rrd file. When calling rrdtool
16 graph in such a setup, the command will tell the daemon to flush out all
17 pending updates for the rrd files, required to draw the graph.
20 RRD Dumping and Restoring (rrdtool dump/restore)
21 ------------------------------------------------
22 by Tobi Oetiker
24 The output of rrdtool dump has been adjusted to be simpler to parse by
25 existing xml parsers.
27 The restore core has been completely re-written yet again and is now relying
28 on an incremental xml parser. This has the advantage that the memory
29 consumption while restoring xml files is only slightly larger than the
30 resulting rrd file. Which is much less than the requirements of the 1.3 and
31 even 1.2
33 RRD Graphing functions (rrdtool graph)
34 --------------------------------------
35 by Martin Sperl
37 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
39 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
40 data prediction without the need to modify existing rrd files as it is
41 required for HoltWinters.
43 * LibDBI integration provides a path to read data directly of a supported
44 SQL database into rrdtool graph.
46 Miscellaneous Changes
47 ---------------------
48 * graph legends can now be placed left, right or above the graph with the
49 new --legend-direction and --legend-positon placement options.
50 by Melchior Rabe
52 * switched to using automake 1.11 which provides a 'silent' build process,
53 causing errors and warnings to stand out much more than before.
54 by Tobi Oetiker
56 * switched from intltoolize to autopoint for the i18n configuration.
57 by Tobi Oetiker
59 * new graph option --grid-dash on:off to configure the dash length
60 in the grid painted over the graph by Tobi Oetiker
62 * lua bindings for rrdtool
63 by Fidelis Assis
65 * various improvements to rrd_open functions and mmap handling
66 by Daniel Pocock
68 * allow the HW smoothing window size to be set to 0 with rrdtool tune
69 by sylvain luiset
71 * new graph option --border to set the 3d border width
72 by Bernhard Reutner-Fischer
74 * draw different color swats depending on the type of line drawn in the
75 graph by Loïc Tortay
77 for more detail see the CHANGES file.
79 #####################################
80 Major Changes between 1.2.x and 1.3.x
81 -------------------------------------
83 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
84 ----------------------------
85 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
87 * implemented full mmap-based file access with madvise hints for
88 improved scalability, much reduced memory-footprint and much less
89 blocking while accessing the disk
91 * implemented optional full file-descriptor access instead of FILE*
92 access
94 NEW Graphing (Tobi Oetiker)
95 ------------
96 * libart has been replaced by cairo/pango
98 * pango markup is supported (--pango-markup)
100 * full grid fitting
102 * --graph-render-mode=mono for non anti aliased graphing
104 * --font-render-mode=mono for non anti aliased fonts
106 * fonts come through fontconfig, use the Pango font naming scheme
107 -> 'Times 20' ... it is not possible to use true-type fonts
108 directly anymore.
110 * Tabs are position independent.
112 * TRENDNAN filter that ignores NAN values while calculating the
113 TREND data. (Timo Stripf)
115 * --full-size-mode to specify the outer border of the image and not
116 just of the graphing canvas (Matthew Chambers)
118 * TEXTALIGN command to alter default text alignment behavior
120 * C API in-memory graphing with rrd_graph_v (Evan Miller)
122 * draw dashed lines in graphs (Thomas Gutzler)
124 * new interface graphv which returns information using the rrd_info
125 interface (Tobi Oetiker and Mark Plaksin)
127 * improved horizontal grid. Have a bit more grid lines and y-axis
128 labels while keeping them far enough apart to not run into each
129 other.
131 NEW Forecasting (Evan Miller)
132 ---------------
133 * the new MHWPREDICT consolidation function uses a variation of the
134 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
135 and is better suited for data whose seasonal variations grow or
136 shrink in proportion to the average.
138 * If you create an RRD with the new MHWPREDICT function, the
139 resulting rrd file will be version 0004 and can only be used in
140 rrdtool 1.3.
142 Rewrites
143 --------
144 * rrd_restore now uses libxml for parsing which makes things much
145 more tolerant towards xml variations. The old code could mostly
146 just parse the XML as it was output by rrdtool dump. See also:
147 the note at the bottom of this document. (by Florian octo
148 Forster)
150 * rrd_update rewritten to make it more modular. Fixed two
151 longstanding HW bugs in the process (Evan Miller)
153 Internationalization (Takao Fujiwara and Tobi Oetiker)
154 --------------------
155 * The help output by rrdtool has been internationalized. There are
156 no real translations included with rrdtool yet, contributions are
157 welcome.
159 * The internationalization will only be compiled if libintl and
160 friends are available on your system. Use the configure option
161 --disable-libintl if you want to disable this feature
163 Language Bindings
164 -----------------
165 * ruby rrd_fetch will return step as a last property -- Mike Perham
167 RRDtool dump / restore incompatibility
168 --------------------------------------
169 * rrdtool dump 1.3 does emit completely legal XML. Basically this
170 means that it contains an XML header and a DOCTYPE definition.
171 Unfortunately this causes older versions of rrdtool restore to be
172 unhappy.
174 * To restore a new dump with an old rrdtool restore version, either
175 remove the XML header and the doctype by hand (both on the first
176 line of the dump) or use rrdtool dump --no-header.
179 ######################################################################################
180 Major Changes between 1.0.x and 1.2.x
181 ======================================================================================
182 Graphing
183 --------
185 * rewritten graphics generation based on libart.
186 - anti-aliased output
187 - alpha transparency support
188 - truetype fonts
190 * additional graphics formats: EPS, PDF, SVG
192 * extended multi-part documentation
194 * VDEF support; define and use variables. Find, and use, the
195 maximum rate seen by rrdtool; compute and show the average
197 * Sliding window (trend) analysis
198 Compute a smoother average, for instance over the last 6 CDPs
200 * percentile (95th or other)
201 Remove peaks, 95 percent of all rates are at or below the
202 returned value
204 Logging
205 -------
206 * a second logging interface: rrdtool updatev
207 Verbose updating of the database; show CPDs being created
209 * Aberrant Behavior Detection with Holt-Winters Forecasting
210 Compare current data with expected data, detect and log when
211 the rates are outside expected levels
213 * COMPUTE data type for artificial data-sources calculating their
214 input using RPN math and data from the other data-sources.
216 Incompatibilities
217 -----------------
218 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
220 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
221 without functionality.
223 * In pipe mode, rrdtool answers with OK only if it was successful with the
224 command. Otherwhise the answer will be ERROR...
227 Behind the Scenes
228 -----------------
229 * In order to support Holt-Winters and Calculated Datasources,
230 the rrdtool data format has changed. While the new version of rrdtool can
231 read files created with rrdtool 1.0.x. It is not possible to read files
232 created by rrdtool-1.2.x with rrdtool-1.0.x
234 * External libraries are not included with rrdtool anymore. This is in line
235 with todays trend of using shared libraries everywhere. With the exception
236 of the cgi library most things required by rrdtool will be found on every recent
237 system.
239 * Memory Mapped IO support for faster logging.