New issue 45 by hieu.hcmus@gmail.com: [Compact issue] Offset overflow http://code.google.com/p/weed-fs/issues/detail?id=45 You are using uint32(Maximum 4Gb) to store needle offset(Maximum 32Gb) when compacting. Currently It is ok if the volume size is < 4gb Change variable "offset" in ScanVolumeFile function to uint64 to fix the issue.