author | Kim Alvefur <zash@zash.se> |
Thu, 30 Mar 2017 23:47:03 +0200 | |
changeset 2665 | 1d734acabd46 |
parent 2174 | 4652a112a4ba |
child 2822 | 88474dd1af48 |
permissions | -rw-r--r-- |
2174
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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1 |
This module is an experiment about a more graceful shutdown process. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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2 |
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4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
3 |
Why |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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4 |
=== |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
5 |
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4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
6 |
When shutting down, a number of sessions, connections and other things |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
7 |
are teared down. Due to all these things happening very quickly, |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
8 |
sometimes eg client unavailable notifications don't make it to all |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
9 |
remote contacts because the server-to-server connections are teared down |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
10 |
just after. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
11 |
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4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
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How |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
13 |
=== |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
14 |
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4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
15 |
This module works by breaking the shutdown process into separate steps |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
16 |
with a brief pause between them. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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17 |
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4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
18 |
It goes something like this |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
19 |
|
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
20 |
1. Stop accepting new client connections. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
21 |
2. Close all client connections. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
22 |
3. Fire event for everything else. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
23 |
4. Tell `net.server` to quit the main loop. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
24 |
5. ??? |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
25 |
6. Still here? Kill itself. |
4652a112a4ba
mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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26 |