Avoid lock when ecs_compatibility is explicitly specified #16786
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Because a `break` escapes a `begin`...`end` block, we must not use a `break` in order to ensure that the explicitly set value gets memoized to avoid lock contention.
> ~~~ ruby
> def fake_sync(&block)
> puts "FAKE_SYNC:enter"
> val = yield
> puts "FAKE_SYNC:return(#{val})"
> return val
> ensure
> puts "FAKE_SYNC:ensure"
> end
>
> fake_sync do
> @ivar = begin
> puts("BE:begin")
> break :break
>
> val = :ret
> puts("BE:return(#{val})")
> val
> ensure
> puts("BE:ensure")
> end
> end
> ~~~
Note: no `FAKE_SYNC:return`:
> ~~~
> ╭─{ rye@perhaps:~/src/elastic/logstash (main ✔) }
> ╰─● ruby break-esc.rb
> FAKE_SYNC:enter
> BE:begin
> BE:ensure
> FAKE_SYNC:ensure
> [success]
> ~~~
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@logstashmachine backport 8.x |
|
@logstashmachine backport 8.17 |
github-actions bot
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Dec 19, 2024
Because a `break` escapes a `begin`...`end` block, we must not use a `break` in order to ensure that the explicitly set value gets memoized to avoid lock contention.
> ~~~ ruby
> def fake_sync(&block)
> puts "FAKE_SYNC:enter"
> val = yield
> puts "FAKE_SYNC:return(#{val})"
> return val
> ensure
> puts "FAKE_SYNC:ensure"
> end
>
> fake_sync do
> @ivar = begin
> puts("BE:begin")
> break :break
>
> val = :ret
> puts("BE:return(#{val})")
> val
> ensure
> puts("BE:ensure")
> end
> end
> ~~~
Note: no `FAKE_SYNC:return`:
> ~~~
> ╭─{ rye@perhaps:~/src/elastic/logstash (main ✔) }
> ╰─● ruby break-esc.rb
> FAKE_SYNC:enter
> BE:begin
> BE:ensure
> FAKE_SYNC:ensure
> [success]
> ~~~
(cherry picked from commit 01c8e8b)
2 tasks
github-actions bot
pushed a commit
that referenced
this pull request
Dec 19, 2024
Because a `break` escapes a `begin`...`end` block, we must not use a `break` in order to ensure that the explicitly set value gets memoized to avoid lock contention.
> ~~~ ruby
> def fake_sync(&block)
> puts "FAKE_SYNC:enter"
> val = yield
> puts "FAKE_SYNC:return(#{val})"
> return val
> ensure
> puts "FAKE_SYNC:ensure"
> end
>
> fake_sync do
> @ivar = begin
> puts("BE:begin")
> break :break
>
> val = :ret
> puts("BE:return(#{val})")
> val
> ensure
> puts("BE:ensure")
> end
> end
> ~~~
Note: no `FAKE_SYNC:return`:
> ~~~
> ╭─{ rye@perhaps:~/src/elastic/logstash (main ✔) }
> ╰─● ruby break-esc.rb
> FAKE_SYNC:enter
> BE:begin
> BE:ensure
> FAKE_SYNC:ensure
> [success]
> ~~~
(cherry picked from commit 01c8e8b)
2 tasks
|
@logstashmachine backport 8.16 |
github-actions bot
pushed a commit
that referenced
this pull request
Dec 19, 2024
Because a `break` escapes a `begin`...`end` block, we must not use a `break` in order to ensure that the explicitly set value gets memoized to avoid lock contention.
> ~~~ ruby
> def fake_sync(&block)
> puts "FAKE_SYNC:enter"
> val = yield
> puts "FAKE_SYNC:return(#{val})"
> return val
> ensure
> puts "FAKE_SYNC:ensure"
> end
>
> fake_sync do
> @ivar = begin
> puts("BE:begin")
> break :break
>
> val = :ret
> puts("BE:return(#{val})")
> val
> ensure
> puts("BE:ensure")
> end
> end
> ~~~
Note: no `FAKE_SYNC:return`:
> ~~~
> ╭─{ rye@perhaps:~/src/elastic/logstash (main ✔) }
> ╰─● ruby break-esc.rb
> FAKE_SYNC:enter
> BE:begin
> BE:ensure
> FAKE_SYNC:ensure
> [success]
> ~~~
(cherry picked from commit 01c8e8b)
2 tasks
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Release notes
ecs_compatibilitydirective.What does this PR do?
Properly memoizes an explicitly-given
ecs_compatibilitydirective on first access so that it can be retrieved without lock contention.Because a
breakescapes abegin...endblock, we must not use abreakin order to ensure that the explicitly set value gets memoized to avoid lock contention.Note: no
FAKE_SYNC:return:Why is it important/What is the impact to the user?
Eliminates unnecessary lock contention, which can prevent some plugins from running as concurrently as they would otherwise be able.
Checklist
[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration files (and/or docker env variables)[ ] I have added tests that prove my fix is effective or that my feature worksHow to test this PR locally
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