#####################################

Major Changes between 1.5.x and 1.6.x

-------------------------------------

API

---

* librrd_th is gone. librrd is now fully thread-safe

RRD Graph

---------

* new CDEF function SMIN: a,b,c,3,SMIN -> min(a,b,c)

* new CDEF function SMAX: a,b,c,3,SMAX -> max(a,b,c)

* new CDEF function STDEV: a,b,c,3,STDEV -> stdev(a,b,c)

* new CDEF function POW: a,b,POW -> a**b

* new CDEF function PERCENT: a,b,c,95,3,PERCENT -> find 95percentile of a,b,c

#####################################

Major Changes between 1.4.x and 1.5.x

-------------------------------------

RRD Graph

---------

* Ability to use data from a callback function to supply data

for graphs. With perl bindings for writing the callbacks in perl.

* Second color option for AREAs causing a gradient effect

by Rian Shelley

* RRDcached awareness. Instead of just flushing the file, data can now

be pulled in from remote RRDcached instances.

* VDEF results do now explicitly KNOW when they have no time associated

and can behave appropriately. -- Jean-Edouard Babin

RRDcreate

---------

Ability to use exiting rrd files to pre-populate new ones. Allowing to

preserve data even when fundamentally changing the structure of your rrd

files.

RRDcached

----------

* New FETCH command allowing rrd_fetch to operate through the daemon and

thus work remotely. By Florian Forster

* New rrd_client commands INFO, FIRST, LAST, CREATE by Steve Shipway

API

---

* exported rrd_update_v_r for theadsave rrd_update calls

libDBI

------

* make rrdfillmissing actually work. The parameter is now in seconds and not

in steps for ease of use by Hans J�rgen Jakobsen

Bindings

--------

* dotnet by Chris Larsen of Euphoria Audio

#####################################

Major Changes between 1.3.x and 1.4.x

-------------------------------------

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 file handling 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.

See rrdcached documentation.

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

consumption while restoring xml files is only slightly larger than the

resulting rrd file. Which is much less than the requirements of the 1.3 and

even 1.2

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. See rrdgraph_libdbi documentation.

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

* new graph option --grid-dash on:off to configure the dash length

in the grid painted over the graph 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

* new graph option --border to set the 3d border width

by Bernhard Reutner-Fischer

* draw different color markers (enable with --dynamic-labels) depending on the

type of element in the graph by Lo�c Tortay

for more detail see the CHANGES file.

#####################################

Major Changes between 1.2.x and 1.3.x

-------------------------------------

NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)

----------------------------

* 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 while accessing the 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 (--pango-markup)

* full grid fitting

* --graph-render-mode=mono for non anti aliased graphing

* --font-render-mode=mono for non anti aliased fonts

* fonts come through fontconfig, use the Pango font naming scheme

-> 'Times 20' ... it is not possible to use true-type fonts

directly anymore.

* Tabs are position independent.

* TRENDNAN filter that ignores NAN values while calculating 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 behavior

* C API in-memory graphing with rrd_graph_v (Evan Miller)

* draw dashed lines in graphs (Thomas Gutzler)

* new interface graphv which returns information using the rrd_info

interface (Tobi Oetiker and Mark Plaksin)

* improved horizontal grid. Have a bit more grid lines and y-axis

labels while keeping them far enough apart to not run into each

other.

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 rrd file 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:

the note at the bottom 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

Language Bindings

-----------------

* ruby rrd_fetch will return step as a last property -- Mike Perham

RRDtool dump / restore incompatibility

--------------------------------------

* 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 an 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.

######################################################################################

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. Otherwise 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.