1 #####################################
2 Major Changes between 1.4.x and ...
3 -------------------------------------
8 * GRAD element for graph, it acts more or less like an AREA,
9 except you can specify a second color and a height which is used to
10 create a gradient from one color to the next
13 * RRDcached awareness. Instead of just flushing the file, data can now
14 be pulled in from remote RRDcached instances.
18 * New FETCH command allowing rrd_fetch to operate through the daemon and
19 thus work remotely. By Florian Forster
24 #####################################
25 Major Changes between 1.3.x and 1.4.x
26 -------------------------------------
28 RRD Caching Daemon (rrdcached)
29 ------------------------------
30 by Florian Forster and Kevin Brintnall
32 The RRD Caching Daemon can dramatically improve the 'update' performance
33 of your system. Due to file handling overheads, the time it takes todo one
34 update is virtually the same as to doing two updates in a row.
36 The Cache Daemon intercepts rrdtool update calls, assembling multiple
37 updates before writing them to the actual rrd file. When calling rrdtool
38 graph in such a setup, the command will tell the daemon to flush out all
39 pending updates for the rrd files, required to draw the graph.
41 See rrdcached documentation.
43 RRD Dumping and Restoring (rrdtool dump/restore)
44 ------------------------------------------------
47 The output of rrdtool dump has been adjusted to be simpler to parse by
50 The restore core has been completely re-written yet again and is now relying
51 on an incremental xml parser. This has the advantage that the memory
52 consumption while restoring xml files is only slightly larger than the
53 resulting rrd file. Which is much less than the requirements of the 1.3 and
56 RRD Graphing functions (rrdtool graph)
57 --------------------------------------
60 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
62 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
63 data prediction without the need to modify existing rrd files as it is
64 required for HoltWinters.
66 * LibDBI integration provides a path to read data directly of a supported
67 SQL database into rrdtool graph. See rrdgraph_libdbi documentation.
71 * graph legends can now be placed left, right or above the graph with the
72 new --legend-direction and --legend-positon placement options.
75 * switched to using automake 1.11 which provides a 'silent' build process,
76 causing errors and warnings to stand out much more than before.
79 * switched from intltoolize to autopoint for the i18n configuration.
82 * new graph option --grid-dash on:off to configure the dash length
83 in the grid painted over the graph by Tobi Oetiker
85 * lua bindings for rrdtool
88 * various improvements to rrd_open functions and mmap handling
91 * allow the HW smoothing window size to be set to 0 with rrdtool tune
94 * new graph option --border to set the 3d border width
95 by Bernhard Reutner-Fischer
97 * draw different color markers (enable with --dynamic-labels) depending on the
98 type of element in the graph by Loïc Tortay
100 for more detail see the CHANGES file.
102 #####################################
103 Major Changes between 1.2.x and 1.3.x
104 -------------------------------------
106 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
107 ----------------------------
108 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
110 * implemented full mmap-based file access with madvise hints for
111 improved scalability, much reduced memory-footprint and much less
112 blocking while accessing the disk
114 * implemented optional full file-descriptor access instead of FILE*
117 NEW Graphing (Tobi Oetiker)
119 * libart has been replaced by cairo/pango
121 * pango markup is supported (--pango-markup)
125 * --graph-render-mode=mono for non anti aliased graphing
127 * --font-render-mode=mono for non anti aliased fonts
129 * fonts come through fontconfig, use the Pango font naming scheme
130 -> 'Times 20' ... it is not possible to use true-type fonts
133 * Tabs are position independent.
135 * TRENDNAN filter that ignores NAN values while calculating the
136 TREND data. (Timo Stripf)
138 * --full-size-mode to specify the outer border of the image and not
139 just of the graphing canvas (Matthew Chambers)
141 * TEXTALIGN command to alter default text alignment behavior
143 * C API in-memory graphing with rrd_graph_v (Evan Miller)
145 * draw dashed lines in graphs (Thomas Gutzler)
147 * new interface graphv which returns information using the rrd_info
148 interface (Tobi Oetiker and Mark Plaksin)
150 * improved horizontal grid. Have a bit more grid lines and y-axis
151 labels while keeping them far enough apart to not run into each
154 NEW Forecasting (Evan Miller)
156 * the new MHWPREDICT consolidation function uses a variation of the
157 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
158 and is better suited for data whose seasonal variations grow or
159 shrink in proportion to the average.
161 * If you create an RRD with the new MHWPREDICT function, the
162 resulting rrd file will be version 0004 and can only be used in
167 * rrd_restore now uses libxml for parsing which makes things much
168 more tolerant towards xml variations. The old code could mostly
169 just parse the XML as it was output by rrdtool dump. See also:
170 the note at the bottom of this document. (by Florian octo
173 * rrd_update rewritten to make it more modular. Fixed two
174 longstanding HW bugs in the process (Evan Miller)
176 Internationalization (Takao Fujiwara and Tobi Oetiker)
178 * The help output by rrdtool has been internationalized. There are
179 no real translations included with rrdtool yet, contributions are
182 * The internationalization will only be compiled if libintl and
183 friends are available on your system. Use the configure option
184 --disable-libintl if you want to disable this feature
188 * ruby rrd_fetch will return step as a last property -- Mike Perham
190 RRDtool dump / restore incompatibility
191 --------------------------------------
192 * rrdtool dump 1.3 does emit completely legal XML. Basically this
193 means that it contains an XML header and a DOCTYPE definition.
194 Unfortunately this causes older versions of rrdtool restore to be
197 * To restore a new dump with an old rrdtool restore version, either
198 remove the XML header and the doctype by hand (both on the first
199 line of the dump) or use rrdtool dump --no-header.
202 ######################################################################################
203 Major Changes between 1.0.x and 1.2.x
204 ======================================================================================
208 * rewritten graphics generation based on libart.
209 - anti-aliased output
210 - alpha transparency support
213 * additional graphics formats: EPS, PDF, SVG
215 * extended multi-part documentation
217 * VDEF support; define and use variables. Find, and use, the
218 maximum rate seen by rrdtool; compute and show the average
220 * Sliding window (trend) analysis
221 Compute a smoother average, for instance over the last 6 CDPs
223 * percentile (95th or other)
224 Remove peaks, 95 percent of all rates are at or below the
229 * a second logging interface: rrdtool updatev
230 Verbose updating of the database; show CPDs being created
232 * Aberrant Behavior Detection with Holt-Winters Forecasting
233 Compare current data with expected data, detect and log when
234 the rates are outside expected levels
236 * COMPUTE data type for artificial data-sources calculating their
237 input using RPN math and data from the other data-sources.
241 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
243 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
244 without functionality.
246 * In pipe mode, rrdtool answers with OK only if it was successful with the
247 command. Otherwhise the answer will be ERROR...
252 * In order to support Holt-Winters and Calculated Datasources,
253 the rrdtool data format has changed. While the new version of rrdtool can
254 read files created with rrdtool 1.0.x. It is not possible to read files
255 created by rrdtool-1.2.x with rrdtool-1.0.x
257 * External libraries are not included with rrdtool anymore. This is in line
258 with todays trend of using shared libraries everywhere. With the exception
259 of the cgi library most things required by rrdtool will be found on every recent
262 * Memory Mapped IO support for faster logging.