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
27 #####################################
28 Major Changes between 1.3.x and 1.4.x
29 -------------------------------------
31 RRD Caching Daemon (rrdcached)
32 ------------------------------
33 by Florian Forster and Kevin Brintnall
35 The RRD Caching Daemon can dramatically improve the 'update' performance
36 of your system. Due to file handling overheads, the time it takes todo one
37 update is virtually the same as to doing two updates in a row.
39 The Cache Daemon intercepts rrdtool update calls, assembling multiple
40 updates before writing them to the actual rrd file. When calling rrdtool
41 graph in such a setup, the command will tell the daemon to flush out all
42 pending updates for the rrd files, required to draw the graph.
44 See rrdcached documentation.
46 RRD Dumping and Restoring (rrdtool dump/restore)
47 ------------------------------------------------
50 The output of rrdtool dump has been adjusted to be simpler to parse by
53 The restore core has been completely re-written yet again and is now relying
54 on an incremental xml parser. This has the advantage that the memory
55 consumption while restoring xml files is only slightly larger than the
56 resulting rrd file. Which is much less than the requirements of the 1.3 and
59 RRD Graphing functions (rrdtool graph)
60 --------------------------------------
63 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
65 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
66 data prediction without the need to modify existing rrd files as it is
67 required for HoltWinters.
69 * LibDBI integration provides a path to read data directly of a supported
70 SQL database into rrdtool graph. See rrdgraph_libdbi documentation.
74 * graph legends can now be placed left, right or above the graph with the
75 new --legend-direction and --legend-positon placement options.
78 * switched to using automake 1.11 which provides a 'silent' build process,
79 causing errors and warnings to stand out much more than before.
82 * switched from intltoolize to autopoint for the i18n configuration.
85 * new graph option --grid-dash on:off to configure the dash length
86 in the grid painted over the graph by Tobi Oetiker
88 * lua bindings for rrdtool
91 * various improvements to rrd_open functions and mmap handling
94 * allow the HW smoothing window size to be set to 0 with rrdtool tune
97 * new graph option --border to set the 3d border width
98 by Bernhard Reutner-Fischer
100 * draw different color markers (enable with --dynamic-labels) depending on the
101 type of element in the graph by Loïc Tortay
103 for more detail see the CHANGES file.
105 #####################################
106 Major Changes between 1.2.x and 1.3.x
107 -------------------------------------
109 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
110 ----------------------------
111 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
113 * implemented full mmap-based file access with madvise hints for
114 improved scalability, much reduced memory-footprint and much less
115 blocking while accessing the disk
117 * implemented optional full file-descriptor access instead of FILE*
120 NEW Graphing (Tobi Oetiker)
122 * libart has been replaced by cairo/pango
124 * pango markup is supported (--pango-markup)
128 * --graph-render-mode=mono for non anti aliased graphing
130 * --font-render-mode=mono for non anti aliased fonts
132 * fonts come through fontconfig, use the Pango font naming scheme
133 -> 'Times 20' ... it is not possible to use true-type fonts
136 * Tabs are position independent.
138 * TRENDNAN filter that ignores NAN values while calculating the
139 TREND data. (Timo Stripf)
141 * --full-size-mode to specify the outer border of the image and not
142 just of the graphing canvas (Matthew Chambers)
144 * TEXTALIGN command to alter default text alignment behavior
146 * C API in-memory graphing with rrd_graph_v (Evan Miller)
148 * draw dashed lines in graphs (Thomas Gutzler)
150 * new interface graphv which returns information using the rrd_info
151 interface (Tobi Oetiker and Mark Plaksin)
153 * improved horizontal grid. Have a bit more grid lines and y-axis
154 labels while keeping them far enough apart to not run into each
157 NEW Forecasting (Evan Miller)
159 * the new MHWPREDICT consolidation function uses a variation of the
160 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
161 and is better suited for data whose seasonal variations grow or
162 shrink in proportion to the average.
164 * If you create an RRD with the new MHWPREDICT function, the
165 resulting rrd file will be version 0004 and can only be used in
170 * rrd_restore now uses libxml for parsing which makes things much
171 more tolerant towards xml variations. The old code could mostly
172 just parse the XML as it was output by rrdtool dump. See also:
173 the note at the bottom of this document. (by Florian octo
176 * rrd_update rewritten to make it more modular. Fixed two
177 longstanding HW bugs in the process (Evan Miller)
179 Internationalization (Takao Fujiwara and Tobi Oetiker)
181 * The help output by rrdtool has been internationalized. There are
182 no real translations included with rrdtool yet, contributions are
185 * The internationalization will only be compiled if libintl and
186 friends are available on your system. Use the configure option
187 --disable-libintl if you want to disable this feature
191 * ruby rrd_fetch will return step as a last property -- Mike Perham
193 RRDtool dump / restore incompatibility
194 --------------------------------------
195 * rrdtool dump 1.3 does emit completely legal XML. Basically this
196 means that it contains an XML header and a DOCTYPE definition.
197 Unfortunately this causes older versions of rrdtool restore to be
200 * To restore a new dump with an old rrdtool restore version, either
201 remove the XML header and the doctype by hand (both on the first
202 line of the dump) or use rrdtool dump --no-header.
205 ######################################################################################
206 Major Changes between 1.0.x and 1.2.x
207 ======================================================================================
211 * rewritten graphics generation based on libart.
212 - anti-aliased output
213 - alpha transparency support
216 * additional graphics formats: EPS, PDF, SVG
218 * extended multi-part documentation
220 * VDEF support; define and use variables. Find, and use, the
221 maximum rate seen by rrdtool; compute and show the average
223 * Sliding window (trend) analysis
224 Compute a smoother average, for instance over the last 6 CDPs
226 * percentile (95th or other)
227 Remove peaks, 95 percent of all rates are at or below the
232 * a second logging interface: rrdtool updatev
233 Verbose updating of the database; show CPDs being created
235 * Aberrant Behavior Detection with Holt-Winters Forecasting
236 Compare current data with expected data, detect and log when
237 the rates are outside expected levels
239 * COMPUTE data type for artificial data-sources calculating their
240 input using RPN math and data from the other data-sources.
244 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
246 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
247 without functionality.
249 * In pipe mode, rrdtool answers with OK only if it was successful with the
250 command. Otherwhise the answer will be ERROR...
255 * In order to support Holt-Winters and Calculated Datasources,
256 the rrdtool data format has changed. While the new version of rrdtool can
257 read files created with rrdtool 1.0.x. It is not possible to read files
258 created by rrdtool-1.2.x with rrdtool-1.0.x
260 * External libraries are not included with rrdtool anymore. This is in line
261 with todays trend of using shared libraries everywhere. With the exception
262 of the cgi library most things required by rrdtool will be found on every recent
265 * Memory Mapped IO support for faster logging.