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in_tail: document num_threads - #716

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Watson1978 merged 2 commits into
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Watson1978:in-tail-num-threads
Oct 23, 2026
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Watson1978:in-tail-num-threads

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fluent/fluentd#5529 adds num_threads to in_tail, released in v1.20.0. This documents the parameter: what moves to the worker threads and what stays on the event loop, the conditions under which worker parsing is enabled, the bounded queue, the behavior on parse errors and at shutdown, and the fields added to in_monitor_agent.

This should be merged after v1.20.0 is released.

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Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Signed-off-by: Shizuo Fujita <fujita@clear-code.com>
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Watson1978 requested a review from ashie October 22, 2026 10:08

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Overall, this accurately describes the implementation and clearly explains the intended latency benefits without promising higher throughput. I left a few inline suggestions to clarify the compatibility conditions, restart behavior, and limitations of the latency improvement.

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Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Signed-off-by: Shizuo Fujita <fujita@clear-code.com>
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Watson1978 requested a review from ashie October 23, 2026 00:31

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Thanks! All three points have been addressed. The updated documentation looks good to me.

@Watson1978 Watson1978 added the pending To be done in the future label Oct 23, 2026
@Watson1978 Watson1978 added this to the fluentd-v1.20 milestone Oct 23, 2026
@Watson1978 Watson1978 removed the pending To be done in the future label Oct 23, 2026
@Watson1978
Watson1978 merged commit 0a416cb into fluent:1.0 Oct 23, 2026
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@Watson1978
Watson1978 deleted the in-tail-num-threads branch October 23, 2026 06:21
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2 participants