Don't hold lock unless necessary in PoolByteStream.close() #1038
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Summary
Don't hold lock unless necessary in PoolByteStream.close().
This lock causes significant contention and slowdown in LiteLLM when used with streaming but sync HTTP transport.
Testing: this patch was validated through load testing that decreased lock contention (validated with py-spy) and significantly decreased wall clock completion time of concurrent streaming LLM requests via LiteLLM.
Checklist