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New hooks for snapshot and transaction ID acquisition from external source - Mailing list pgsql-hackers

From Michael Paquier
Subject New hooks for snapshot and transaction ID acquisition from external source
Date
Msg-id CAB7nPqTDjf-58wuf-xZ01NKJ7WF0E+EUKgGQHd0igVsOD4hCJQ@mail.gmail.com
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Responses Re: New hooks for snapshot and transaction ID acquisition from external source  (Tom Lane <tgl@sss.pgh.pa.us>)
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Hi,<br /><br />What do you think about adding hooks for transaction ID and snapshot acquisition? Those hooks could be
locatedin AssignTransactionId:xact.c for transaction ID and GetTransactionSnapshot:snapmgr.c for snapshots.<br /> This
isuseful for multi-master applications that use external tools to feed with unique transaction IDs and global snapshots
allthe nodes of a cluster in order to maintain global data consistency and visibility, one of the examples being
clusterapplications like Postgres-XC.<br /><br clear="all" />Opinions?<br />-- <br />Michael<br />

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