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10b0bdce02
* feat: pass expected_data_size from clients for size-aware assignment Add expected_data_size field to AssignRequest (master proto) and AssignVolumeRequest (filer proto) so clients can hint how large the data will be. The master uses this instead of the 1MB default when tracking pending volume sizes for weighted assignment. - Add expected_data_size to master.proto AssignRequest - Add expected_data_size to filer.proto AssignVolumeRequest - Wire through filer AssignVolume handler - Wire through HTTP submit handler (uses actual upload size) - Add ExpectedDataSize to VolumeAssignRequest in operation package - Topology.PickForWrite accepts optional expectedDataSize parameter * fix: guard integer conversions in expected_data_size path - common.go: clamp OriginalDataSize to non-negative before uint64 cast - topology.go: cap expectedDataSize at math.MaxInt64 before int64 cast * fix: parse dataSize hint in HTTP /dir/assign and test non-zero expectedDataSize - HTTP /dir/assign now parses optional "dataSize" query parameter and passes it to PickForWrite instead of hardcoded 0 - Add test assertion for PickForWrite with non-zero expectedDataSize