X-Git-Url: https://git.octo.it/?p=rrdtool.git;a=blobdiff_plain;f=NEWS;h=ba0d8ad92f80748318b839b08190a286fdcc454c;hp=2d2abf789e59bb12c268f2dacf9fe3f8911bb480;hb=2fe1a1c93f2240b9c9ac2137f1b17b2e20213486;hpb=eb44444f03424eb0a1ce61320e1fd9fe88eb26e1 diff --git a/NEWS b/NEWS index 2d2abf7..ba0d8ad 100644 --- a/NEWS +++ b/NEWS @@ -1,140 +1,67 @@ -RRDTOOL NEWS -============ -Major Changes between 1.2.x and 1.3.x - -RRdtool dump / restore Incompatibilities ----------------------------------------- -rrdtool dump 1.3 does emit completely legal xml. Basically this means that -it contains an xml header and a DOCTYPE definition. Unfortunately this -causes older versions of rrdtool restore to be unhappy. - -To restore a new dump with ann old rrdtool restore version, either remove -the xml header and the doctype by hand (both on the first line of the dump) -or use rrdtool dump --no-header. - -NEW File access methods (Bernhard Fischer) -------------------- -* introduced file-accessor functions rrd_read/rrd_seek/rrd_write -* implemented full mmap-based file access with madvise hints for improved - scalability, much reduced memory-footprint and much less blocking on - disk -* implemented optional full file-descriptor access instead of FILE* access - -NEW Graphing (Tobi Oetiker) --------- -* libart has been replaced by cairo/pango -* pango markup is supported -* full gridfitting -* --graph-render-mode=mono for non antialiased graphing -* --font-render-mode=mono for non antialiased fonts -* fonts come through fontconfig, use the Pango fontnameing - scheme -> 'Times 20' ... it is not possible to use - truetype fonts directly anymore. -* Tabs are position independent. -* TRENDNAN filter that ignores NAN values while caculating the TREND data. (Timo Stripf) -* --full-size-mode to specify the outer border of the image and not just of the graphing canvas (Matthew Chambers) -* TEXTALIGN command to alter default text alignment behaviour -* C API in-memory graphing with rrd_graph_v (Evan Miller) -* draw dashed lines in graphs (Thomas Gutzler) -* new interface graphv which returns inforamation using the rrd_info - interface (Tobi Oetiker and Mark Plaksin) - -NEW Forecasting (Evan Miller) ------------ -* the new MHWPREDICT consolidation function uses a variation of the Holt-Winters - method. It is a drop-in replacement for HWPREDICT, and is better suited for - data whose seasonal variations grow or shrink in proportion to the average. - -* If you create an RRD with the new MHWPREDICT function, the resulting - rrdfile will be version 0004 and can only be used in rrdtool 1.3. - -Rewrites --------- -* rrd_restore now uses libxml for parsing which makes things much more - tolerant towards xml variations. The old code could mostly just parse the - xml as it was output by rrdtool dump. See also: 'incompatibilities' at the - top of this document. (by Florian octo Forster) - -* rrd_update rewritten to make it more modular. Fixed two longstanding - HW bugs in the process (Evan Miller) - -Internationalization (Takao Fujiwara and Tobi Oetiker) --------------------- -* The help output by rrdtool has been internationalized. There are no real - translations included with rrdtool yet, contributions are welcome. -* The internationalization will only be compiled if libintl and friends are - available on your system. Use the configure option --disable-libintl if - you want to disable this feature - -Misc ----- -* ruby rrd_fetch will return step as a last property -- Mike Perham - -Locale Independent Numeric Input --------------------------------- -* Regardles of locale you are in, rrdtool always expects input to be numbers - (LC_NUMERIC) in C or POSIX locale for numbers. (not 1,1 but 1.1) this is - necessary to make things like RPN work as it uses , as a separator. - -RRDTOOL NEWS -============ -Major Changes between 1.0.x and 1.2.x - -Graphing --------- - -* rewritten graphics generation based on libart. - - anti-aliased output - - alpha transparency support - - truetype fonts - -* additional graphics formats: EPS, PDF, SVG - -* extended multi-part documentation - -* VDEF support; define and use variables. Find, and use, the - maximum rate seen by rrdtool; compute and show the average - -* Sliding window (trend) analysis - Compute a smoother average, for instance over the last 6 CDPs - -* percentile (95th or other) - Remove peaks, 95 percent of all rates are at or below the - returned value - -Logging -------- -* a second logging interface: rrdtool updatev - Verbose updating of the database; show CPDs being created - -* Aberrant Behavior Detection with Holt-Winters Forecasting - Compare current data with expected data, detect and log when - the rates are outside expected levels - -* COMPUTE data type for artificial data-sources calculating their - input using RPN math and data from the other data-sources. - -Incompatibilities ------------------ -* Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash - -* the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but - without functionality. - -* In pipe mode, rrdtool answers with OK only if it was successful with the - command. Otherwhise the answer will be ERROR... - - -Behind the Scenes ------------------ -* In order to support Holt-Winters and Calculated Datasources, - the rrdtool data format has changed. While the new version of rrdtool can - read files created with rrdtool 1.0.x. It is not possible to read files - created by rrdtool-1.2.x with rrdtool-1.0.x - -* External libraries are not included with rrdtool anymore. This is in line - with todays trend of using shared libraries everywhere. With the exception - of the cgi library most things required by rrdtool will be found on every recent - system. - -* Memory Mapped IO support for faster logging. +News for RRDtool 1.4 +==================== +$Id$ + +RRD Caching Daemon (rrdcached) +------------------------------ +by Florian Forster and Kevin Brintnall + +The RRD Caching Daemon can dramatically improve the 'update' performance +of your system. Due to filehandling overheads, the time it takes todo one +update is virtually the same as to doing two updates in a row. + +The Cache Daemon intercepts rrdtool update calls, assembling multiple +updates before writing them to the actual rrd file. When calling rrdtool +graph in such a setup, the command will tell the daemon to flush out all +pending updates for the rrd files, required to draw the graph. + + +RRD Dumping and Restoring (rrdtool dump/restore) +------------------------------------------------ +by Tobi Oetiker + +The output of rrdtool dump has been adjusted to be simpler to parse by +existing xml parsers. + +The restore core has been completely re-written yet again and is now relying +on an incremental xml parser. This has the advantage that the memory +consumtion while restoring xml files is only slighly larger than the +resulting rrd file. Which is much less than the requirements of the 1.3. + +RRD Graphing functions (rrdtool graph) +-------------------------------------- +by Martin Sperl + +* VDEF PERCENTNAN (a PRECENT that ignores NAN) + +* CDEF PREDICT and PREDICTSIGMA functions for on-the-fly + data prediction without the need to modify existing rrd files as it is + required for HoltWinters. + +* LibDBI integration provides a path to read data directly of a supported + SQL database into rrdtool graph. + +Miscellaneous Changes +--------------------- + +* graph legends can now be placed left, right or above the graph with the + new --legend-direction and --legend-positon placement options. + by Melchior Rabe + +* switched to using automake 1.11 which provides a 'silent' build process, + causing errors and warnings to stand out much more than before. + by Tobi Oetiker + +* switched from intltoolize to autopoint for the i18n configuration. + by Tobi Oetiker + +* lua bindings for rrdtool + by Fidelis Assis + +* various improvements to rrd_open functions and mmap handling + by Daniel Pocock + +* allow the HW smoothing window size to be set to 0 with rrdtool tune + by sylvain luiset + +for more detail see the CHANGES file.