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Remove all remaining synchronized implementations of Sampler.sample #809
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added 2 commits
October 14, 2021 18:14
- Add volatile keyword to underlying samplers so updated references can be made available to other threads. See jaegertracing#609 for similar work. Fixes jaegertracing#807 Signed-off-by: Will Tran <will@autonomic.ai>
- Use a ConcurrentHashMap for operationNameToSampler so that any number of concurrent calls to sample can be made and safely modify it. - Add volatile to any fields that can be changed by the update method to ensure visibility of changes to other threads. - Retain instances of GuaranteedThroughputSampler to preserve their rate limit balances across updates when parameters don't change improving on jaegertracing/jaeger#1729 See jaegertracing#609 for similar work. Fixes jaegertracing#807 Signed-off-by: Will Tran <will@autonomic.ai>
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Which problem is this PR solving?
Fixes #807 and improves on jaegertracing/jaeger#1729 by not replacing samplers on every update. Rate limit budgets will only be reset if the operation's lower bound rate limit changes.
Short description of the changes
volatilefields similar to Concurrency improvements to RemoteControlledSampler #609volatilefields and a ConcurrentHashMap instead