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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.

The following table describes the features and the way they are implemented in our four main extensions:

An implementation of synchronousmulti-master replication based oncommit timestamps.

An implementation of synchronousmulti-master replication based onsnapshot sharing.

An implementation ofdistributed transaction management based onsnapshot sharing.

An implementation ofdistributed transaction management based oncommit timestamps.

A distributed transaction management daemon.Used bypg_dtm andmultimaster.

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