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branch draft-guix-build-coordinator-blog-post updated: Revise
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From: |
Christopher Baines |
|
Subject: |
branch draft-guix-build-coordinator-blog-post updated: Revise |
|
Date: |
Wed, 21 Apr 2021 17:09:48 -0400 |
This is an automated email from the git hooks/post-receive script.
cbaines pushed a commit to branch draft-guix-build-coordinator-blog-post
in repository guix-artwork.
The following commit(s) were added to
refs/heads/draft-guix-build-coordinator-blog-post by this push:
new 36f104e Revise
36f104e is described below
commit 36f104e5cb16407cb87573810a3fc35a3f118ffc
Author: Christopher Baines <mail@cbaines.net>
AuthorDate: Wed Apr 21 22:09:04 2021 +0100
Revise
---
...ilding-derivations-how-complicated-can-it-be.md | 167 ++-
.../blog/img/build-coordinator-architecture.dia | 1273 ++++++++++++++++++++
.../blog/img/build-coordinator-architecture.svg | 127 ++
3 files changed, 1505 insertions(+), 62 deletions(-)
diff --git
a/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
b/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
index 3188f01..b26fdd9 100644
--- a/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
+++ b/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
@@ -4,21 +4,31 @@ author: Christopher Baines
tags: Guix Build Coordinator, Continuous integration, Quality Assurance
---
-Or to put it another way, how complicated can you make it?
-
-# Background
+Derivations are key to Guix, they're the low-level build instructions
+used for things like packages, disk images, and most things than end
+up in the store.
Around a year ago, the established approach to build derivations
-across multiple machines was guix-daemon offloading. The Guix Build
-Coordinator project set out to provide an alternative approach though,
-aimed at addressing two specific use cases.
+across multiple machines was [guix-daemon
+offloading][offloading]. This offloading approach is mostly static in
+terms of the machines involved and used SSH to communicate and move
+things between machines.
+
+[offloading]:
https://guix.gnu.org/manual/en/html_node/Daemon-Offload-Setup.html
+
+The [Guix Build Coordinator project][guix-build-coordinator] set out
+to provide an alternative approach, both to explore what's possible,
+but also as a usable tool to address two specific use cases.
-The first use case was building things for substitutes. At the time,
-the guix-daemon offloading approach used on ci.guix.gnu.org, the
-default source of substitutes for Guix users was not scaling
-particularly well and there was an opportunity to improve on this.
+[guix-build-coordinator]: https://git.cbaines.net/guix/build-coordinator/about/
-The second use case was more aspirations, support various quality
+The first use case was building things (mostly packages) for
+substitutes. At the time, the guix-daemon offloading approach used on
+ci.guix.gnu.org which is the default source of substitutes. This
+approach was not scaling particularly well so there was room for
+improvement.
+
+The second use case was more aspirational, support various quality
assurance tasks, like building packages changed by patches, regularly
testing fixed output derivations, or building the same derivations
across different machines to test for hardware specific differences.
@@ -30,35 +40,32 @@ design of the Guix Build Coordinator.
# Architecture
Like offloading, the Guix Build Coordinator works in a centralised
-manor. There's one coordinator process which manages state, and agent
+manner. There's one coordinator process which manages state, and agent
processes run on the machines that perform builds. The coordinator
plans which builds to allocate to which agents, and agents ask the
coordinator for builds, which they then attempt.
-Agents fetch derivations and build inputs using substitutes, and will
-report back to the coordinator if they're unable to setup for a
-build. If the setup failed because there are missing store items, the
-Guix Build Coordinator by default will check for builds for these
-store items, and if there are none, it'll submit a build.
-
-The builds to perform are worked through methodically, every build has
-a priority, and the build allocation strategies take this in to
-account when planning what builds each agent should work on next. The
-allocation strategy is very configurable, and the Guix Build
-Coordinator comes with two currently.
-
-The basic allocation strategy is the default. It doesn't assume that a
-successful build has to exist for outputs to be available, which is
-appropriate if you're trying to build some derivations in conjunction
-with substitutes available from elsewhere. This allocation strategy is
-very suited to general use cases, including building things for
-quality assurance purposes.
-
-The other allocation strategy is the derivation ordered one. This
-allocation strategy assumes that the Guix Build Coordinator instance
-is building the entire graph, so it expects that substitutes will only
-be available if a successful build exists. This allocation strategy is
-particularly suited for building things for serving substitutes.
+Once agents complete a build, they send the log file and any outputs
+back to the coordinator. This is shown in the diagram below. Note that
+the Guix Build Coordinator doesn't actually take care of building the
+individual derivations, that's still left to the guix-daemon's on the
+machines involved.
+
+
+
+The builds to perform are worked through methodically, a build won't
+start unless all the inputs are available. This behaviour replicates
+what the guix-daemon does, but across all the machines involved.
+
+If agents can't setup to perform a build, they report this back to the
+coordinator, which may then perform other builds to produce those
+required inputs.
+
+Currently HTTP is used when agents want to communicate to the
+coordinator, although additional approaches could be implemented in
+the future. Similarly, SQLite is used as the database, but from the
+start there has been a plan to support PostgreSQL, but that's not
+currently implemented.
# Comparison to offloading
@@ -75,55 +82,91 @@ connection established while builds are progressing.
With offloading, the guix-daemon reaches out to another machine,
copies over all the inputs and the derivation, and then starts the
build. Rather than doing this, the Guix Build Coordinator agent pulls
-in the inputs and derivation using substitutes. This removes the need
+in the inputs and derivation using substitutes.
+
+This pull approach has a few advantages, firstly it removes the need
to keep a large store on the machine running the coordinator, and this
large store requirement of using offloading became a problem in terms
-of scalability for the offloading approach.
+of scalability for the offloading approach. Another advantage is that
+it makes deploying agents easier, as they don't need to be reachable
+from the coordinator over the network, which can be an issue with NATs
+or virtual machines.
-Additionally, when offloading builds, the outputs would be copied back
-to the store on build success. Instead, the Guix Build Coordinator
-agent sends the outputs back as nar files. The coordinator would then
-process these nar files to make substitutes available. This helps
-distribute the work in generating the nar files, which can be quite
-expensive.
+When offloading builds, the outputs would be copied back to the store
+on build success. Instead, the Guix Build Coordinator agent sends the
+outputs back as nar files. The coordinator would then process these
+nar files to make substitutes available. This helps distribute the
+work in generating the nar files, which can be quite expensive.
These differences may be subtle, but the architecture makes a big
-difference, it's much easier to store and serve nars at scale than it
-is to maintain a large store.
+difference, it's much easier to store and serve nars at scale if this
+doesn't require a large store managed by a single guix-daemon.
-One of the other innovations the Guix Build Coordinator brings is a
-high degree of customizability through hooks. There are bits of code
-(hooks) that run when certain events happen, like a build gets
-submitted, or a build finished successfully. It's these hooks that are
-responsible for doing things like processing nars to be served as
-substitutes, or submitting retries for a failed build.
+There's also quite a few things in common with the guix-daemon
+offloading approach. Builds are still methodically performed across
+multiple machines, and load is taken in to account when starting new
+builds.
+
+# Applications of the Guix Build Coordinator
+
+While I think the Guix Build Coordinator is a better choice than
+guix-daemon offloading in some circumstances, it doesn't currently
+replace it.
+
+At a high level, the Guix Build Coordinator is useful where there's a
+need to build derivations and do something with the outputs or build
+results, more than just having the outputs in the local store. This
+could be serving substitutes, or testing derivations for example.
+
+At small scales, the additional complexity of the coordinator is
+probably unnecessary, but when it's useful to use multiple machines,
+either because of the resources that provides, or because of a more
+diverse range of hardware, then it makes much more sense to use the
+Guix Build Coordinator to coordinate what's going on.
+
+# Looking forward
+
+The Guix Build Coordinator isn't just an alternative to guix-daemon
+offloading, it's more a general toolkit for coordinating the building
+of derivations.
+
+Much of the functionality in the Guix Build Coordinator happens in
+hooks. There are bits of code (hooks) that run when certain events
+happen, like a build gets submitted, or a build finished
+successfully. It's these hooks that are responsible for doing things
+like processing nars to be served as substitutes, or submitting
+retries for a failed build.
This hook to automatically retry building particular derivations is
particularly useful when trying to provide substitutes where you want
to lessen the impact of random failures, or for quality assurance
purposes, where you want more data to better identify problems.
-In general, this approach with the hooks means I've started thinking
-of the Guix Build Coordinator as an extensible toolkit for performing
-Guix builds.
+There are also more features such as build and agent tags and build
+priorities that can be really useful in some scenarios.
-# Looking forward
+Looking far in to the future, I hope that some of the things that
+worked or didn't work in the Guix Build Coordinator will inform what
+iterations of the guix-daemon might look like. Both in terms of it's
+interface, and what features it will support, like whether it supports
+working across multiple machines.
-My hope is that the Guix Build Coordinator will enable a better
-substitute experience for Guix users, as well as enabling a whole new
-range of quality assurance tasks. It's already possible to see some
-impact from the Guix Build Coordinator, but there's still much work to
-do!
+In the near future, my hope is that the Guix Build Coordinator will
+enable a better substitute experience for Guix users, as well as
+enabling a whole new range of quality assurance tasks. It's already
+possible to see some impact from the Guix Build Coordinator, but
+there's still much work to do!
## Additional reading
- - [Git repository](https://git.cbaines.net/guix/build-coordinator/)
+ - [Guix Build Coordinator Git
repository](https://git.cbaines.net/guix/build-coordinator/)
- [2020/04/17 - Initial announcement - Prototype tool for building
derivations](https://lists.gnu.org/archive/html/guix-devel/2020-04/msg00323.html)
- [2020/09/19 - \[PATCH 0/4\] Add package and services for the Guix Build
Coordinator](https://issues.guix.gnu.org/43494)
- [2020/11/17 - Thoughts on building things for substitutes and the Guix
Build
Coordinator](https://lists.gnu.org/archive/html/guix-devel/2020-11/msg00417.html)
- [2020/11/22 - Guix Days 2020 - Progress so far on the Guix Build
Coordinator](https://xana.lepiller.eu/guix-days-2020/guix-days-2020-christopher-baines-guix-build-coordinator.mp4)
- [2021/02/09 - The Guix Build Coordinator in
2021](https://lists.gnu.org/archive/html/guix-devel/2021-02/msg00148.html)
- [2021/02/14 - Getting the Guix Build Coordinator agent working on the
Hurd](https://lists.gnu.org/archive/html/guix-devel/2021-02/msg00223.html)
+ - [2021/03/08 - Hurd substitute availability (27.5%) and next
steps?](https://lists.gnu.org/archive/html/guix-devel/2021-03/msg00074.html)
#### About GNU Guix
diff --git a/website/static/blog/img/build-coordinator-architecture.dia
b/website/static/blog/img/build-coordinator-architecture.dia
new file mode 100644
index 0000000..492be1b
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+ <dia:rectangle val="10.0147,0.127744;12.9597,2.02774"/>
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+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
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+ <dia:point val="10.0647,0.177744"/>
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+ <dia:real val="2.8449999999999998"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="1.8"/>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="exstate">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="attrib">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
+ </dia:attribute>
+ <dia:attribute name="height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="pos">
+ <dia:point val="0.5,1.095"/>
+ </dia:attribute>
+ <dia:attribute name="color">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="alignment">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="is_active">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="show_attribs">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="multiple">
+ <dia:boolean val="false"/>
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+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="text_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>#agent#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
+ </dia:attribute>
+ <dia:attribute name="height">
+ <dia:real val="0.80000000000000004"/>
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+ <dia:point val="11.4872,1.27274"/>
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+ <dia:attribute name="color">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="alignment">
+ <dia:enum val="1"/>
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+ <dia:attribute name="line_width">
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffffff"/>
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+ </dia:object>
+ <dia:object type="UML - Object" version="0" id="O6">
+ <dia:attribute name="obj_pos">
+ <dia:point val="18.2493,0.152783"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="18.1993,0.102783;23.5043,2.00278"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="18.2493,0.152783"/>
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+ <dia:attribute name="elem_width">
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+ <dia:attribute name="elem_height">
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+ <dia:attribute name="exstate">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="attrib">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
+ </dia:attribute>
+ <dia:attribute name="height">
+ <dia:real val="0.80000000000000004"/>
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+ <dia:attribute name="pos">
+ <dia:point val="0.5,1.095"/>
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+ <dia:attribute name="color">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="alignment">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="is_active">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="show_attribs">
+ <dia:boolean val="false"/>
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+ <dia:attribute name="multiple">
+ <dia:boolean val="false"/>
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+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="text_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>#guix-daemon#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
+ </dia:attribute>
+ <dia:attribute name="height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="pos">
+ <dia:point val="20.8518,1.24778"/>
+ </dia:attribute>
+ <dia:attribute name="color">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="alignment">
+ <dia:enum val="1"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffffff"/>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Lifeline" version="0" id="O7">
+ <dia:attribute name="obj_pos">
+ <dia:point val="20.8518,1.95278"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="20.4518,1.92778;21.2518,11.8463"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="conn_endpoints">
+ <dia:point val="20.8518,1.95278"/>
+ <dia:point val="20.8518,11.8213"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffffff"/>
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+ <dia:attribute name="rtop">
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+ <dia:attribute name="rbot">
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+ <dia:attribute name="draw_focus">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="draw_cross">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_northwest">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_southwest">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_northeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_southeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O6" connection="6"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Message" version="0" id="O8">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.8372,6.33941"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="11.7871,5.92292;20.5525,6.99469"/>
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+ <dia:attribute name="meta">
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+ <dia:point val="11.8372,6.33941"/>
+ <dia:point val="20.5018,6.32301"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:string>#substitute derivation#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="text_height">
+ <dia:real val="0.63499999312083333"/>
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+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text_pos">
+ <dia:point val="16.1695,6.83121"/>
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+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
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+ <dia:connection handle="0" to="O1" connection="46"/>
+ <dia:connection handle="1" to="O7" connection="0"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Message" version="0" id="O9">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.8372,8.33941"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="11.7871,7.92292;20.5525,8.99469"/>
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+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
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+ <dia:attribute name="conn_endpoints">
+ <dia:point val="11.8372,8.33941"/>
+ <dia:point val="20.5018,8.32301"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:string>#(finished)#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:enum val="4"/>
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+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="text_height">
+ <dia:real val="0.63499999312083333"/>
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+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text_pos">
+ <dia:point val="16.1695,8.83121"/>
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+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O1" connection="50"/>
+ <dia:connection handle="1" to="O7" connection="4"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Lifeline" version="0" id="O10">
+ <dia:attribute name="obj_pos">
+ <dia:point val="20.8589,9.1496"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="20.4589,9.1246;21.2589,13.8638"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
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+ <dia:attribute name="conn_endpoints">
+ <dia:point val="20.8589,9.1496"/>
+ <dia:point val="20.8589,13.8388"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="rbot">
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+ <dia:attribute name="draw_focus">
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+ <dia:attribute name="draw_cross">
+ <dia:boolean val="false"/>
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+ <dia:attribute name="cpl_northwest">
+ <dia:int val="1"/>
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+ <dia:attribute name="cpl_southwest">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_northeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_southeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Message" version="0" id="O11">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.8372,10.3394"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="11.7872,9.94909;20.5593,11.0078"/>
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+ <dia:point val="11.8372,10.3394"/>
+ <dia:point val="20.5089,10.3492"/>
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+ <dia:attribute name="text">
+ <dia:string>#substitute inputs#</dia:string>
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+ <dia:attribute name="type">
+ <dia:enum val="0"/>
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+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:real val="0.63499999312083333"/>
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+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text_pos">
+ <dia:point val="16.1731,10.8443"/>
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+ <dia:real val="0.10000000000000001"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ </dia:object>
+ <dia:object type="UML - Lifeline" version="0" id="O12">
+ <dia:attribute name="obj_pos">
+ <dia:point val="20.8545,13.1572"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="20.4545,13.1322;21.2545,18.7745"/>
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+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
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+ <dia:attribute name="conn_endpoints">
+ <dia:point val="20.8545,13.1572"/>
+ <dia:point val="20.8545,18.7495"/>
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+ <dia:attribute name="draw_focus">
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+ <dia:attribute name="draw_cross">
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+ <dia:attribute name="cpl_northwest">
+ <dia:int val="1"/>
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+ <dia:attribute name="cpl_southwest">
+ <dia:int val="5"/>
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+ <dia:attribute name="cpl_northeast">
+ <dia:int val="1"/>
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+ <dia:attribute name="cpl_southeast">
+ <dia:int val="5"/>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Message" version="0" id="O13">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.8372,13.3394"/>
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+ <dia:attribute name="obj_bb">
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+ <dia:point val="11.8372,13.3394"/>
+ <dia:point val="20.5045,13.4026"/>
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+ <dia:attribute name="text">
+ <dia:string>#build derivation#</dia:string>
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+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:real val="0.63499999312083333"/>
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+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text_pos">
+ <dia:point val="16.1708,13.871"/>
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+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:connection handle="0" to="O1" connection="60"/>
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+ <dia:object type="UML - Message" version="0" id="O14">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.1372,13.8394"/>
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+ <dia:attribute name="obj_bb">
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+ <dia:point val="11.1372,13.8394"/>
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+ <dia:attribute name="text">
+ <dia:string>#report build start#</dia:string>
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+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text_pos">
+ <dia:point val="6.96326,14.3525"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:connection handle="0" to="O1" connection="24"/>
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+ <dia:object type="UML - Message" version="0" id="O15">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.8372,17.3394"/>
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+ <dia:attribute name="obj_bb">
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+ <dia:point val="11.8372,17.3394"/>
+ <dia:point val="20.5045,17.4026"/>
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+ <dia:attribute name="text">
+ <dia:string>#build finished (successfuly)#</dia:string>
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+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="line_colour">
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+ <dia:connection handle="0" to="O1" connection="68"/>
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+ <dia:object type="UML - Message" version="0" id="O16">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.1372,17.8394"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="2.73275,17.4649;11.1874,18.5157"/>
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+ <dia:attribute name="conn_endpoints">
+ <dia:point val="11.1372,17.8394"/>
+ <dia:point val="2.78398,17.8651"/>
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+ <dia:attribute name="text">
+ <dia:string>#submit log file#</dia:string>
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+ <dia:attribute name="type">
+ <dia:enum val="0"/>
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+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="text_height">
+ <dia:real val="0.63499999312083333"/>
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+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text_pos">
+ <dia:point val="6.9606,18.3522"/>
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+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
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+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
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+ <dia:connection handle="0" to="O1" connection="32"/>
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+ <dia:object type="UML - Message" version="0" id="O17">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.1372,20.8394"/>
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+ <dia:attribute name="obj_bb">
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+ <dia:point val="11.1372,20.8394"/>
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+ <dia:attribute name="text">
+ <dia:string>#submit output(s)#</dia:string>
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diff --git a/website/static/blog/img/build-coordinator-architecture.svg
b/website/static/blog/img/build-coordinator-architecture.svg
new file mode 100644
index 0000000..b14bb15
--- /dev/null
+++ b/website/static/blog/img/build-coordinator-architecture.svg
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