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Various experiments with PostgreSQL clustering perfomed at PostgresPro.

This is a mirror of postgres repo with several changes to the core and a few extra extensions.

• Transaction manager interface (eXtensible Transaction Manager, xtm). Generic interface to plug distributed transaction engines. More info onpostgres wiki and onthe email thread.
• Distributed deadlock detection API.
• Logical decoding of transactions.

A distributed transaction management daemon.Used bypg_dtm andmultimaster.

A synchronous multi-master replication based onlogical decoding andxtm.

A synchronous multi-master replication based onsnapshot sharing.

A coordinator-based distributed transaction management implementation based onsnapshot sharing.

A coordinator-less distributed transaction management implementation based oncommit timestamps.

A key-value table replicated over Raft protocol.Used bymmts.