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 * dotnet by Chris Larsen of Euphoria Audio
35 #####################################
36 Major Changes between 1.3.x and 1.4.x
37 -------------------------------------
39 RRD Caching Daemon (rrdcached)
40 ------------------------------
41 by Florian Forster and Kevin Brintnall
43 The RRD Caching Daemon can dramatically improve the 'update' performance
44 of your system. Due to file handling overheads, the time it takes todo one
45 update is virtually the same as to doing two updates in a row.
47 The Cache Daemon intercepts rrdtool update calls, assembling multiple
48 updates before writing them to the actual rrd file. When calling rrdtool
49 graph in such a setup, the command will tell the daemon to flush out all
50 pending updates for the rrd files, required to draw the graph.
52 See rrdcached documentation.
54 RRD Dumping and Restoring (rrdtool dump/restore)
55 ------------------------------------------------
58 The output of rrdtool dump has been adjusted to be simpler to parse by
61 The restore core has been completely re-written yet again and is now relying
62 on an incremental xml parser. This has the advantage that the memory
63 consumption while restoring xml files is only slightly larger than the
64 resulting rrd file. Which is much less than the requirements of the 1.3 and
67 RRD Graphing functions (rrdtool graph)
68 --------------------------------------
71 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
73 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
74 data prediction without the need to modify existing rrd files as it is
75 required for HoltWinters.
77 * LibDBI integration provides a path to read data directly of a supported
78 SQL database into rrdtool graph. See rrdgraph_libdbi documentation.
82 * graph legends can now be placed left, right or above the graph with the
83 new --legend-direction and --legend-positon placement options.
86 * switched to using automake 1.11 which provides a 'silent' build process,
87 causing errors and warnings to stand out much more than before.
90 * switched from intltoolize to autopoint for the i18n configuration.
93 * new graph option --grid-dash on:off to configure the dash length
94 in the grid painted over the graph by Tobi Oetiker
96 * lua bindings for rrdtool
99 * various improvements to rrd_open functions and mmap handling
102 * allow the HW smoothing window size to be set to 0 with rrdtool tune
105 * new graph option --border to set the 3d border width
106 by Bernhard Reutner-Fischer
108 * draw different color markers (enable with --dynamic-labels) depending on the
109 type of element in the graph by Loïc Tortay
111 for more detail see the CHANGES file.
113 #####################################
114 Major Changes between 1.2.x and 1.3.x
115 -------------------------------------
117 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
118 ----------------------------
119 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
121 * implemented full mmap-based file access with madvise hints for
122 improved scalability, much reduced memory-footprint and much less
123 blocking while accessing the disk
125 * implemented optional full file-descriptor access instead of FILE*
128 NEW Graphing (Tobi Oetiker)
130 * libart has been replaced by cairo/pango
132 * pango markup is supported (--pango-markup)
136 * --graph-render-mode=mono for non anti aliased graphing
138 * --font-render-mode=mono for non anti aliased fonts
140 * fonts come through fontconfig, use the Pango font naming scheme
141 -> 'Times 20' ... it is not possible to use true-type fonts
144 * Tabs are position independent.
146 * TRENDNAN filter that ignores NAN values while calculating the
147 TREND data. (Timo Stripf)
149 * --full-size-mode to specify the outer border of the image and not
150 just of the graphing canvas (Matthew Chambers)
152 * TEXTALIGN command to alter default text alignment behavior
154 * C API in-memory graphing with rrd_graph_v (Evan Miller)
156 * draw dashed lines in graphs (Thomas Gutzler)
158 * new interface graphv which returns information using the rrd_info
159 interface (Tobi Oetiker and Mark Plaksin)
161 * improved horizontal grid. Have a bit more grid lines and y-axis
162 labels while keeping them far enough apart to not run into each
165 NEW Forecasting (Evan Miller)
167 * the new MHWPREDICT consolidation function uses a variation of the
168 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
169 and is better suited for data whose seasonal variations grow or
170 shrink in proportion to the average.
172 * If you create an RRD with the new MHWPREDICT function, the
173 resulting rrd file will be version 0004 and can only be used in
178 * rrd_restore now uses libxml for parsing which makes things much
179 more tolerant towards xml variations. The old code could mostly
180 just parse the XML as it was output by rrdtool dump. See also:
181 the note at the bottom of this document. (by Florian octo
184 * rrd_update rewritten to make it more modular. Fixed two
185 longstanding HW bugs in the process (Evan Miller)
187 Internationalization (Takao Fujiwara and Tobi Oetiker)
189 * The help output by rrdtool has been internationalized. There are
190 no real translations included with rrdtool yet, contributions are
193 * The internationalization will only be compiled if libintl and
194 friends are available on your system. Use the configure option
195 --disable-libintl if you want to disable this feature
199 * ruby rrd_fetch will return step as a last property -- Mike Perham
201 RRDtool dump / restore incompatibility
202 --------------------------------------
203 * rrdtool dump 1.3 does emit completely legal XML. Basically this
204 means that it contains an XML header and a DOCTYPE definition.
205 Unfortunately this causes older versions of rrdtool restore to be
208 * To restore a new dump with an old rrdtool restore version, either
209 remove the XML header and the doctype by hand (both on the first
210 line of the dump) or use rrdtool dump --no-header.
213 ######################################################################################
214 Major Changes between 1.0.x and 1.2.x
215 ======================================================================================
219 * rewritten graphics generation based on libart.
220 - anti-aliased output
221 - alpha transparency support
224 * additional graphics formats: EPS, PDF, SVG
226 * extended multi-part documentation
228 * VDEF support; define and use variables. Find, and use, the
229 maximum rate seen by rrdtool; compute and show the average
231 * Sliding window (trend) analysis
232 Compute a smoother average, for instance over the last 6 CDPs
234 * percentile (95th or other)
235 Remove peaks, 95 percent of all rates are at or below the
240 * a second logging interface: rrdtool updatev
241 Verbose updating of the database; show CPDs being created
243 * Aberrant Behavior Detection with Holt-Winters Forecasting
244 Compare current data with expected data, detect and log when
245 the rates are outside expected levels
247 * COMPUTE data type for artificial data-sources calculating their
248 input using RPN math and data from the other data-sources.
252 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
254 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
255 without functionality.
257 * In pipe mode, rrdtool answers with OK only if it was successful with the
258 command. Otherwhise the answer will be ERROR...
263 * In order to support Holt-Winters and Calculated Datasources,
264 the rrdtool data format has changed. While the new version of rrdtool can
265 read files created with rrdtool 1.0.x. It is not possible to read files
266 created by rrdtool-1.2.x with rrdtool-1.0.x
268 * External libraries are not included with rrdtool anymore. This is in line
269 with todays trend of using shared libraries everywhere. With the exception
270 of the cgi library most things required by rrdtool will be found on every recent
273 * Memory Mapped IO support for faster logging.