Gahow Wang
0500350849
Root cause: each vLLM instance has a random NONE_HASH (os.urandom(32)) when PYTHONHASHSEED is not set. All block hashes are chained from NONE_HASH, so D's hashes never match C's hashes. Fix: C's bootstrap server now accepts token_ids and does the prefix cache lookup locally using C's own hash function and block pool. No cross-instance hash matching needed. New flow: D sends prompt token_ids → C computes hashes on C's side → C looks up in C's own BlockPool → returns block_ids. Also: module-level _shared_block_pool for scheduler→bootstrap bridge, prompt_token_ids passed through PullReqMeta, test script added. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>