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Reuse one Bedrock client for a pipeline's requests - #6222
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AWSBedrockLLMService opens its aiobotocore client in setup() and closes it in cleanup(), so the requests of a running pipeline share one connection pool. A service that is never set up, such as one only called through run_inference() by a classifier, creates a client per request, since nothing would close a kept one. A response stream cut short by an interruption is closed so its connection is not left half-read in the pool. A new client per request costs a TCP and TLS handshake on every turn; from Tokyo that is about 0.4 s of time to first token on us-east-1. The default config keeps idle connections for an hour, since aiobotocore's 12 s default is shorter than the gap between turns.
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Please describe the changes in your PR. If it is addressing an issue, please reference that as well.
What Changed
Reuse the Bedrock client across a pipeline's requests, so each turn skips a new TCP + TLS connection and reaches the first token sooner.
Performance Result
Median TTFT from Tokyo over six runs, shared vs. per-request client:
us-east-1549 vs. 994 ms,us-west-2466 vs. 822 ms,ap-northeast-1793 vs. 911 ms.Notice
setup()and closed incleanup(). A service that is never set up (e.g. one used only byLLMClassifierthroughrun_inference()) still gets a client per request, since nothing would close a kept one. An interrupted response stream is closed so the shared client's pool keeps no half-read connection.keepalive_timeout=3600), since aiobotocore's 12 s default is shorter than the gap between turns.Test Case
Tests cover a client per request before
setup(), one shared client after it, and a successful request after an interrupted stream.