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annotate mod_graceful_shutdown/README.markdown @ 2491:5fbca7de2088

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mod_smacks: Send out more ack requests where needed Under some circumstances it was possible that more than "max_unacked_stanzas" where left in the outgoing stanza queue without forcing an ack. This could happen, when more stanzas entered the queue while the last ack request was still unanswered. Now the test "#queue > max_unacked_stanzas" is done upon receiving an ack as well as when sending out stanzas, which fixes this bug.
author tmolitor <thilo@eightysoft.de>
date Sun, 12 Feb 2017 19:27:50 +0100
parents 4652a112a4ba
children 88474dd1af48
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4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
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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>
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2
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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3 Why
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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4 ===
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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5
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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6 When shutting down, a number of sessions, connections and other things
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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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:
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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>
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9 remote contacts because the server-to-server connections are teared down
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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10 just after.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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11
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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12 How
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13 ===
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14
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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15 This module works by breaking the shutdown process into separate steps
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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16 with a brief pause between them.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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17
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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18 It goes something like this
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4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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20 1. Stop accepting new client connections.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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21 2. Close all client connections.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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22 3. Fire event for everything else.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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23 4. Tell `net.server` to quit the main loop.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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24 5. ???
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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25 6. Still here? Kill itself.
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26