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Chris LuandGitHub
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* Name the failure when the source cluster cannot locate a chunk's volume LookupFileId formatted a nil err into the message it returned, so the only thing a caller could do with "no locations for this volume" was match on the text. Return a typed error instead. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK * Fail a source chunk read on a failure status instead of copying the error page ReadPart never looked at the response status, so a volume server answering 404 for a needle vacuum had removed came back as a successful read whose body was the error page. The caller counted those bytes as file content and reported a size mismatch — a corruption claim about data the source had simply lost — and a 404 from one replica ended the search instead of trying the next. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK * Stop retrying a chunk the source cluster can no longer produce A chunk whose volume vacuum has removed fails the same way on every attempt, but the retry loop had no way to say so and kept going forever. The sync job holding it never finished, so it pinned the offset watermark at the event ahead of it and filer.sync never checkpointed again — alive, quiet, and permanently behind. Wait the source out for a grace period long enough to cover a volume server restart or a master failover, then give up and mark the failure permanent. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK * Let replication continue past an entry whose source data is gone An entry the source can no longer read holds the sync offset forever: the event fails on every replay, so the checkpoint never moves past it and every later event stays uncheckpointed, however long the sync keeps running. Nothing brings those bytes back, so skip the entry with an error naming it and carry on. Skip only while the source is demonstrably still serving other chunks. A volume with no locations reads the same whether it was vacuumed away or every replica is down, and during a cluster-wide outage that answer comes back for every chunk — skipping then would drop live files wholesale. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK * Propagate a missing source chunk instead of waiting when supersession is unverifiable An incremental sink's dated target keys cannot be mapped back to a source path, so nothing here can tell a chunk the source lost from one a later version already replaced. Waiting out the grace period would stall every vacuumed needle for half an hour; hand the failure to the caller, which has the event's real source key. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK * Wait out a gone volume once, not once per file it held A volume vacuum removed took every file it held with it, and each chunk was timing its own grace period. With a bounded chunk executor those waits serialize, so one gone volume holding many files stalls the sync for far longer than the grace period — the wedge again, only slower. Track the wait per source volume on the sink instead: the first chunk to find it unlocatable starts the clock, every later chunk inherits it and gives up as soon as it has run out, and a chunk the source does serve clears it. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK * Probe the source with a read, not a lookup, before writing an entry off A lookup only proves the source master still has the topology. If every volume server is unreachable while the master still lists them, the probe passed and the sink wrote off an entry whose data was merely out of reach. Read the probe chunk instead, and say in the log that the entry stays unreplicated. Claude-Session: https://claude.ai/code/session_01SRPEP4jRu29FbLSN6bjLaK