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Rename "pg_clog" directory to "pg_xact".

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Names containing the letters "log" sometimes confuse users into
believing that only non-critical data is present.  It is hoped
this renaming will discourage ill-considered removals of transaction
status data.

Michael Paquier

Discussion: http://postgr.es/m/CA+Tgmoa9xFQyjRZupbdEFuwUerFTvC6HjZq1ud6GYragGDFFgA@mail.gmail.com
This commit is contained in:
Robert Haas
2017-03-17 09:46:58 -04:00
parent bd9028b824
commit 88e66d193f
28 changed files with 84 additions and 73 deletions
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6
src/backend/utils/time/tqual.c
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@@ -13,9 +13,9 @@
* NOTE: When using a non-MVCC snapshot, we must check
* TransactionIdIsInProgress (which looks in the PGXACT array)
* before TransactionIdDidCommit/TransactionIdDidAbort (which look in
* pg_clog). Otherwise we have a race condition: we might decide that a
* pg_xact). Otherwise we have a race condition: we might decide that a
* just-committed transaction crashed, because none of the tests succeed.
* xact.c is careful to record commit/abort in pg_clog before it unsets
* xact.c is careful to record commit/abort in pg_xact before it unsets
* MyPgXact->xid in the PGXACT array. That fixes that problem, but it
* also means there is a window where TransactionIdIsInProgress and
* TransactionIdDidCommit will both return true. If we check only
@@ -29,7 +29,7 @@
*
* When using an MVCC snapshot, we rely on XidInMVCCSnapshot rather than
* TransactionIdIsInProgress, but the logic is otherwise the same: do not
* check pg_clog until after deciding that the xact is no longer in progress.
* check pg_xact until after deciding that the xact is no longer in progress.
*
*
* Summary of visibility functions: