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[LMCache][Example] Align the PYTHONHASHSEED for prefillers and decoders for KV chunks hashing #21161

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[LMCache][Example] Align the PYTHONHASHSEED for prefillers and decoders for KV chunks hashing #21161

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8 changes: 8 additions & 0 deletions examples/others/lmcache/disagg_prefill_lmcache_v1/disagg_vllm_launcher.sh
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Expand Up @@ -15,6 +15,14 @@ else
MODEL=$2
fi

# The prefillers and decoders in LMCache use the same hash seed for all chunk keys.
# This seed must be aligned so that decoders can identify and retrieve KV cache
# entries stored by prefillers.
#
# WARNING: Using a fixed hash seed is insecure and makes the application vulnerable to
# denial-of-service attacks. In a production environment, this should be set to a
# secure random value. This is set to a fixed value for demonstration purposes only.
export PYTHONHASHSEED=${VLLM_PYTHON_HASH_SEED:-123}

if [[ $1 == "prefiller" ]]; then
# Prefiller listens on port 8100
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