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fix(opensearch): set pool_maxsize so the shared client keeps a real connection pool #15682

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fix(opensearch): set pool_maxsize so the shared client keeps a real connection pool #15682

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11 changes: 10 additions & 1 deletion rag/utils/opensearch_conn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,16 @@ def __init__(self):
http_auth=(settings.OS["username"], settings.OS[
"password"]) if "username" in settings.OS and "password" in settings.OS else None,
verify_certs=False,
timeout=600
timeout=600,
# opensearch-py leaves pool_maxsize unset, so the underlying
# urllib3 HTTPConnectionPool falls back to maxsize=1.
# OSConnection is a @singleton shared by every request thread,
# so concurrent searches and the cluster.health() probe contend
# on a single HTTP connection ("Connection pool is full,
# discarding connection ... pool size: 1"), serializing requests
# behind fresh TLS handshakes. Widen the pool to match the
# multi-connection default elasticsearch-py already uses.
pool_maxsize=10,
)
if self.os:
self.info = self.os.info()
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