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Aleksandr Sorokoumov commented on CASSANDRA-14875:
--------------------------------------------------
It is also applicable to 3.0 and 3.11, but AFAIU only bug fixes are getting
merged there. If you think that this change should be applied to the other
versions as well, I will prepare the patches.
> Explicitly initialize StageManager early in startup
> ---------------------------------------------------
>
> Key: CASSANDRA-14875
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14875
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Aleksandr Sorokoumov
> Assignee: Aleksandr Sorokoumov
> Priority: Minor
> Fix For: 4.x
>
>
> {{StageManager}} initializes itself through a static block and sets up every
> {{Stage}}, including pre-starting their threads. This initizalization can
> take a few hundred milliseconds. This timing impact is unpredictable and hard
> to reason about; it looks like it usually gets hit when creating new
> Keyspaces on start-up and announcing them through migrations.
> While these processes are resilient to these delays, it is dramatically
> easier to reason about over time if this initialization happens explicitly.
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