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Rename "pg_xlog" directory to "pg_wal".

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"xlog" is not a particularly clear abbreviation for "write-ahead log",
and it sometimes confuses users into believe that the contents of the
"pg_xlog" directory are not critical data, leading to unpleasant
consequences.  So, rename the directory to "pg_wal".

This patch modifies pg_upgrade and pg_basebackup to understand both
the old and new directory layouts; the former is necessary given the
purpose of the tool, while the latter merely avoids an unnecessary
backward-compatibility break.

We may wish to consider renaming other programs, switches, and
functions which still use the old "xlog" naming to also refer to
"wal".  However, that's still under discussion, so let's do just this
much for now.

Discussion: CAB7nPqTeC-8+zux8_-4ZD46V7YPwooeFxgndfsq5Rg8ibLVm1A@mail.gmail.com

Michael Paquier
This commit is contained in:
Robert Haas
2016-10-20 11:24:37 -04:00
parent ec7db2b483
commit f82ec32ac3
37 changed files with 276 additions and 223 deletions
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4
src/backend/access/transam/timeline.c
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@@ -43,7 +43,7 @@
/*
* Copies all timeline history files with id's between 'begin' and 'end'
* from archive to pg_xlog.
* from archive to pg_wal.
*/
void
restoreTimeLineHistoryFiles(TimeLineID begin, TimeLineID end)
@@ -191,7 +191,7 @@ readTimeLineHistory(TimeLineID targetTLI)
result = lcons(entry, result);
/*
* If the history file was fetched from archive, save it in pg_xlog for
* If the history file was fetched from archive, save it in pg_wal for
* future reference.
*/
if (fromArchive)