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Add contrib/pg_walinspect.

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Provides similar functionality to pg_waldump, but from a SQL interface
rather than a separate utility.

Author: Bharath Rupireddy
Reviewed-by: Greg Stark, Kyotaro Horiguchi, Andres Freund, Ashutosh Sharma, Nitin Jadhav, RKN Sai Krishna
Discussion: https://postgr.es/m/CALj2ACUGUYXsEQdKhEdsBzhGEyF3xggvLdD8C0VT72TNEfOiog%40mail.gmail.com
This commit is contained in:
Jeff Davis
2022-04-08 00:02:10 -07:00
parent 708007dced
commit 2258e76f90
25 changed files with 1675 additions and 204 deletions
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33
src/backend/access/transam/xlogutils.c
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@@ -80,6 +80,10 @@ typedef struct xl_invalid_page
static HTAB *invalid_page_tab = NULL;
static int
read_local_xlog_page_guts(XLogReaderState *state, XLogRecPtr targetPagePtr,
int reqLen, XLogRecPtr targetRecPtr,
char *cur_page, bool wait_for_wal);
/* Report a reference to an invalid page */
static void
@@ -870,6 +874,31 @@ wal_segment_close(XLogReaderState *state)
int
read_local_xlog_page(XLogReaderState *state, XLogRecPtr targetPagePtr,
int reqLen, XLogRecPtr targetRecPtr, char *cur_page)
{
return read_local_xlog_page_guts(state, targetPagePtr, reqLen,
targetRecPtr, cur_page, true);
}
/*
* Same as read_local_xlog_page except that it doesn't wait for future WAL
* to be available.
*/
int
read_local_xlog_page_no_wait(XLogReaderState *state, XLogRecPtr targetPagePtr,
int reqLen, XLogRecPtr targetRecPtr,
char *cur_page)
{
return read_local_xlog_page_guts(state, targetPagePtr, reqLen,
targetRecPtr, cur_page, false);
}
/*
* Implementation of read_local_xlog_page and its no wait version.
*/
static int
read_local_xlog_page_guts(XLogReaderState *state, XLogRecPtr targetPagePtr,
int reqLen, XLogRecPtr targetRecPtr,
char *cur_page, bool wait_for_wal)
{
XLogRecPtr read_upto,
loc;
@@ -925,6 +954,10 @@ read_local_xlog_page(XLogReaderState *state, XLogRecPtr targetPagePtr,
if (loc <= read_upto)
break;
/* If asked, let's not wait for future WAL. */
if (!wait_for_wal)
break;
CHECK_FOR_INTERRUPTS();
pg_usleep(1000L);
}