{"record":{"id":"0804835034b75759","repo":"exo-explore/exo","slug":"prefill-server-error-msg-code-msg-message","errorCode":null,"errorMessage":"Prefill server error [{msg.code}]: {msg.message}","messagePattern":"Prefill server error \\[(.+?)\\]: (.+?)","errorType":"error_code","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"src/exo/worker/engines/mlx/disaggregated/client.py","lineNumber":98,"sourceCode":"        kv_by_layer: dict[int, list[KVChunk]] = defaultdict(list)\n        chunks_received = 0\n\n        while True:\n            msg = read_message(stream)\n            if msg is None:\n                break\n            if isinstance(msg, KVChunk):\n                kv_by_layer[msg.layer_idx].append(msg)\n                chunks_received += 1\n                if on_kv_chunk is not None:\n                    on_kv_chunk(msg, chunks_received)\n            elif isinstance(msg, ArraysState):\n                result.arrays[msg.layer_idx] = msg.arrays\n            elif isinstance(msg, Done):\n                result.total_tokens = msg.total_tokens\n                break\n            else:\n                raise RuntimeError(f\"Prefill server error [{msg.code}]: {msg.message}\")\n\n        result.kv_chunks = dict(kv_by_layer)\n        return result\n    finally:\n        sock.close()\n\n\ndef ingest_into_mlx_cache(\n    result: PrefillResult,\n    caches: list[KVCache | RotatingKVCache | ArraysCache],\n    *,\n    start_pos: int = 0,\n) -> int:\n    max_received = max(\n        (sum(c.num_tokens for c in chunks) for chunks in result.kv_chunks.values()),\n        default=0,\n    )\n    final_offset = start_pos + max_received","sourceCodeStart":80,"sourceCodeEnd":116,"githubUrl":"https://github.com/exo-explore/exo/blob/21a54c5ea0230a3bec1e1a786d200126c7e34ec6/src/exo/worker/engines/mlx/disaggregated/client.py#L80-L116","documentation":"Error \"Prefill server error [{msg.code}]: {msg.message}\" thrown in exo-explore/exo.","triggerScenarios":"Thrown at src/exo/worker/engines/mlx/disaggregated/client.py:98 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"21a54c5ea0230a3bec1e1a786d200126c7e34ec6","analyzedAt":"2026-08-26T00:02:16.033Z","schemaVersion":2},"datasetVersion":"2026-08-26T04:18:47.238Z"}