From 4aaddf2f009821e29aea3735e44332ad9ca47aaa Mon Sep 17 00:00:00 2001 From: Alvaro Herrera Date: Thu, 24 Nov 2016 15:39:55 -0300 Subject: Fix commit_ts for FrozenXid and BootstrapXid Previously, requesting commit timestamp for transactions FrozenTransactionId and BootstrapTransactionId resulted in an error. But since those values can validly appear in committed tuples' Xmin, this behavior is unhelpful and error prone: each caller would have to special-case those values before requesting timestamp data for an Xid. We already have a perfectly good interface for returning "the Xid you requested is too old for us to have commit TS data for it", so let's use that instead. Backpatch to 9.5, where commit timestamps appeared. Author: Craig Ringer Discussion: https://www.postgresql.org/message-id/CAMsr+YFM5Q=+ry3mKvWEqRTxrB0iU3qUSRnS28nz6FJYtBwhJg@mail.gmail.com --- src/backend/access/transam/commit_ts.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'src/backend/access/transam/commit_ts.c') diff --git a/src/backend/access/transam/commit_ts.c b/src/backend/access/transam/commit_ts.c index 77465788254..a5b270cd20a 100644 --- a/src/backend/access/transam/commit_ts.c +++ b/src/backend/access/transam/commit_ts.c @@ -289,11 +289,18 @@ TransactionIdGetCommitTsData(TransactionId xid, TimestampTz *ts, TransactionId oldestCommitTsXid; TransactionId newestCommitTsXid; - /* error if the given Xid doesn't normally commit */ - if (!TransactionIdIsNormal(xid)) + if (!TransactionIdIsValid(xid)) ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("cannot retrieve commit timestamp for transaction %u", xid))); + else if (!TransactionIdIsNormal(xid)) + { + /* frozen and bootstrap xids are always committed far in the past */ + *ts = 0; + if (nodeid) + *nodeid = 0; + return false; + } LWLockAcquire(CommitTsLock, LW_SHARED); -- cgit v1.2.3