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cd68313929
* fix(filer.sync): resolve manifest chunks against source filer `UpdateEntry` was passing `filer.LookupFn(fs)` — the sink filer client — into `compareChunks`. But `oldEntry`/`newEntry` chunks come from the source cluster, so manifest resolution must hit the source filer's volume servers. With two clusters that have overlapping volume IDs (common once they grow past a few hundred volumes), the sink lookup returns its own volume's URLs and the fetch 404s on the source's fileKey: compare chunks error: fail to read manifest 631,0babe...: 404 Not Found The 404 aborts the diff, the manifest chunk never gets replicated, and the target ends up with whatever flat chunks happened to land from earlier partial syncs — visible as `SIZE_MISMATCH` in filer.sync.verify on files large enough to use chunk manifests (~150 GB+ in practice). Only the manifest path was wrong; flat-chunk reads in `fetchAndWrite` already use `fs.filerSource.ReadPart`. * trim comment * test(filer.sync): regression test for source-filer manifest lookup Two recording filer gRPC servers stand in for source and sink. Driving UpdateEntry with a manifest chunk and observing which one receives LookupVolume proves compareChunks routes source-side lookups through fs.filerSource, not fs. Reverting the fix flips the call onto the sink filer and fails the assertion. * drop test