The problem of synchronizing unordered data (also known as the set reconciliation problem) is modeled as an attempt to compute the symmetric difference between two remote sets and of b-bit numbers. Some solutions to this problem are typified by:
- Wholesale transfer
- In this case all data is transferred to one host for a local comparison.
- Timestamp synchronization
- In this case all changes to the data are marked with timestamps. Synchronization proceeds by transferring all data with a timestamp later than the previous synchronization.
- Mathematical synchronization
- In this case data are treated as mathematical objects and synchronization corresponds to a mathematical process.
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“To write it, it took three months; to conceive it three minutes; to collect the data in itall my life.”
—F. Scott Fitzgerald (18961940)