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hot_restart.rst: update outdated detailed information #17653

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ggreenway merged 5 commits into from
Aug 12, 2021
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hot_restart.rst: update outdated detailed information #17653

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hot_restart.rst: update outdated detailed information
qinggniq Aug 10, 2021
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qinggniq Aug 11, 2021
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qinggniq Aug 11, 2021
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fix rst format
qinggniq Aug 11, 2021
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qinggniq Aug 12, 2021
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7 changes: 4 additions & 3 deletions docs/root/intro/arch_overview/operations/hot_restart.rst
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Expand Up @@ -9,10 +9,11 @@ Envoy can fully reload itself (both code and configuration) without dropping exi
during the :ref:`drain process <arch_overview_draining>`. The hot restart functionality has the
following general architecture:

* Statistics and some locks are kept in a shared memory region. This means that gauges will be
consistent across both processes as restart is taking place.
* The two active processes communicate with each other over unix domain sockets using a basic RPC
protocol.
protocol. All counters are from the old process to the new process over the unix domain, while part

@ggreenway ggreenway Aug 11, 2021

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"All counters are sent from the"

@ggreenway ggreenway Aug 11, 2021

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s/"while part of gauges are transported"/"and gauges are transported except those marked with NeverImport"/

of gauges are transported. After hot restart finished, the gauges transported from the old process

@ggreenway ggreenway Aug 11, 2021

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"After hot restart is finished"

will be cleanup, but special gauge like :ref:`server.hot_restart_generation statistic
<server_statistics>` is retained.
* The new process fully initializes itself (loads the configuration, does an initial service
discovery and health checking phase, etc.) before it asks for copies of the listen sockets from
the old process. The new process starts listening and then tells the old process to start
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