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.
16 * VDEF results do now explicitly KNOW when they have no time associated
17 and can behave appropriately. -- Jean-Edouard Babin
21 * New FETCH command allowing rrd_fetch to operate through the daemon and
22 thus work remotely. By Florian Forster
24 * New rrd_client commands INFO, FIRST, LAST, CREATE by Steve Shipway
28 * exported rrd_update_v_r for theadsave rrd_update calls
32 * make rrdfillmissing actually work. The parameter is now in seconds and not
33 in steps for ease of use by Hans Jørgen Jakobsen
37 * dotnet by Chris Larsen of Euphoria Audio
40 #####################################
41 Major Changes between 1.3.x and 1.4.x
42 -------------------------------------
44 RRD Caching Daemon (rrdcached)
45 ------------------------------
46 by Florian Forster and Kevin Brintnall
48 The RRD Caching Daemon can dramatically improve the 'update' performance
49 of your system. Due to file handling overheads, the time it takes todo one
50 update is virtually the same as to doing two updates in a row.
52 The Cache Daemon intercepts rrdtool update calls, assembling multiple
53 updates before writing them to the actual rrd file. When calling rrdtool
54 graph in such a setup, the command will tell the daemon to flush out all
55 pending updates for the rrd files, required to draw the graph.
57 See rrdcached documentation.
59 RRD Dumping and Restoring (rrdtool dump/restore)
60 ------------------------------------------------
63 The output of rrdtool dump has been adjusted to be simpler to parse by
66 The restore core has been completely re-written yet again and is now relying
67 on an incremental xml parser. This has the advantage that the memory
68 consumption while restoring xml files is only slightly larger than the
69 resulting rrd file. Which is much less than the requirements of the 1.3 and
72 RRD Graphing functions (rrdtool graph)
73 --------------------------------------
76 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
78 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
79 data prediction without the need to modify existing rrd files as it is
80 required for HoltWinters.
82 * LibDBI integration provides a path to read data directly of a supported
83 SQL database into rrdtool graph. See rrdgraph_libdbi documentation.
87 * graph legends can now be placed left, right or above the graph with the
88 new --legend-direction and --legend-positon placement options.
91 * switched to using automake 1.11 which provides a 'silent' build process,
92 causing errors and warnings to stand out much more than before.
95 * switched from intltoolize to autopoint for the i18n configuration.
98 * new graph option --grid-dash on:off to configure the dash length
99 in the grid painted over the graph by Tobi Oetiker
101 * lua bindings for rrdtool
104 * various improvements to rrd_open functions and mmap handling
107 * allow the HW smoothing window size to be set to 0 with rrdtool tune
110 * new graph option --border to set the 3d border width
111 by Bernhard Reutner-Fischer
113 * draw different color markers (enable with --dynamic-labels) depending on the
114 type of element in the graph by Loïc Tortay
116 for more detail see the CHANGES file.
118 #####################################
119 Major Changes between 1.2.x and 1.3.x
120 -------------------------------------
122 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
123 ----------------------------
124 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
126 * implemented full mmap-based file access with madvise hints for
127 improved scalability, much reduced memory-footprint and much less
128 blocking while accessing the disk
130 * implemented optional full file-descriptor access instead of FILE*
133 NEW Graphing (Tobi Oetiker)
135 * libart has been replaced by cairo/pango
137 * pango markup is supported (--pango-markup)
141 * --graph-render-mode=mono for non anti aliased graphing
143 * --font-render-mode=mono for non anti aliased fonts
145 * fonts come through fontconfig, use the Pango font naming scheme
146 -> 'Times 20' ... it is not possible to use true-type fonts
149 * Tabs are position independent.
151 * TRENDNAN filter that ignores NAN values while calculating the
152 TREND data. (Timo Stripf)
154 * --full-size-mode to specify the outer border of the image and not
155 just of the graphing canvas (Matthew Chambers)
157 * TEXTALIGN command to alter default text alignment behavior
159 * C API in-memory graphing with rrd_graph_v (Evan Miller)
161 * draw dashed lines in graphs (Thomas Gutzler)
163 * new interface graphv which returns information using the rrd_info
164 interface (Tobi Oetiker and Mark Plaksin)
166 * improved horizontal grid. Have a bit more grid lines and y-axis
167 labels while keeping them far enough apart to not run into each
170 NEW Forecasting (Evan Miller)
172 * the new MHWPREDICT consolidation function uses a variation of the
173 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
174 and is better suited for data whose seasonal variations grow or
175 shrink in proportion to the average.
177 * If you create an RRD with the new MHWPREDICT function, the
178 resulting rrd file will be version 0004 and can only be used in
183 * rrd_restore now uses libxml for parsing which makes things much
184 more tolerant towards xml variations. The old code could mostly
185 just parse the XML as it was output by rrdtool dump. See also:
186 the note at the bottom of this document. (by Florian octo
189 * rrd_update rewritten to make it more modular. Fixed two
190 longstanding HW bugs in the process (Evan Miller)
192 Internationalization (Takao Fujiwara and Tobi Oetiker)
194 * The help output by rrdtool has been internationalized. There are
195 no real translations included with rrdtool yet, contributions are
198 * The internationalization will only be compiled if libintl and
199 friends are available on your system. Use the configure option
200 --disable-libintl if you want to disable this feature
204 * ruby rrd_fetch will return step as a last property -- Mike Perham
206 RRDtool dump / restore incompatibility
207 --------------------------------------
208 * rrdtool dump 1.3 does emit completely legal XML. Basically this
209 means that it contains an XML header and a DOCTYPE definition.
210 Unfortunately this causes older versions of rrdtool restore to be
213 * To restore a new dump with an old rrdtool restore version, either
214 remove the XML header and the doctype by hand (both on the first
215 line of the dump) or use rrdtool dump --no-header.
218 ######################################################################################
219 Major Changes between 1.0.x and 1.2.x
220 ======================================================================================
224 * rewritten graphics generation based on libart.
225 - anti-aliased output
226 - alpha transparency support
229 * additional graphics formats: EPS, PDF, SVG
231 * extended multi-part documentation
233 * VDEF support; define and use variables. Find, and use, the
234 maximum rate seen by rrdtool; compute and show the average
236 * Sliding window (trend) analysis
237 Compute a smoother average, for instance over the last 6 CDPs
239 * percentile (95th or other)
240 Remove peaks, 95 percent of all rates are at or below the
245 * a second logging interface: rrdtool updatev
246 Verbose updating of the database; show CPDs being created
248 * Aberrant Behavior Detection with Holt-Winters Forecasting
249 Compare current data with expected data, detect and log when
250 the rates are outside expected levels
252 * COMPUTE data type for artificial data-sources calculating their
253 input using RPN math and data from the other data-sources.
257 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
259 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
260 without functionality.
262 * In pipe mode, rrdtool answers with OK only if it was successful with the
263 command. Otherwhise the answer will be ERROR...
268 * In order to support Holt-Winters and Calculated Datasources,
269 the rrdtool data format has changed. While the new version of rrdtool can
270 read files created with rrdtool 1.0.x. It is not possible to read files
271 created by rrdtool-1.2.x with rrdtool-1.0.x
273 * External libraries are not included with rrdtool anymore. This is in line
274 with todays trend of using shared libraries everywhere. With the exception
275 of the cgi library most things required by rrdtool will be found on every recent
278 * Memory Mapped IO support for faster logging.