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Include more status information in walsender results

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Add the current xlog insert location to the response of
IDENTIFY_SYSTEM, and adds result sets containing start
and stop location of backups to BASE_BACKUP responses.
This commit is contained in:
Magnus Hagander
2011-02-03 13:46:23 +01:00
parent f001cb38b6
commit 76129e7f14
4 changed files with 167 additions and 13 deletions
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39
src/backend/replication/basebackup.c
View File

@@ -52,6 +52,7 @@ static void SendBackupHeader(List *tablespaces);
static void base_backup_cleanup(int code, Datum arg);
static void perform_base_backup(basebackup_options *opt, DIR *tblspcdir);
static void parse_basebackup_options(List *options, basebackup_options *opt);
static void SendXlogRecPtrResult(XLogRecPtr ptr);
/*
* Size of each block sent into the tar stream for larger files.
@@ -92,6 +93,7 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
char *labelfile;
startptr = do_pg_start_backup(opt->label, opt->fastcheckpoint, &labelfile);
SendXlogRecPtrResult(startptr);
PG_ENSURE_ERROR_CLEANUP(base_backup_cleanup, (Datum) 0);
{
@@ -239,6 +241,7 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
/* Send CopyDone message for the last tar file */
pq_putemptymessage('c');
}
SendXlogRecPtrResult(endptr);
}
/*
@@ -431,6 +434,42 @@ SendBackupHeader(List *tablespaces)
pq_puttextmessage('C', "SELECT");
}
/*
* Send a single resultset containing just a single
* XlogRecPtr record (in text format)
*/
static void
SendXlogRecPtrResult(XLogRecPtr ptr)
{
StringInfoData buf;
char str[MAXFNAMELEN];
snprintf(str, sizeof(str), "%X/%X", ptr.xlogid, ptr.xrecoff);
pq_beginmessage(&buf, 'T'); /* RowDescription */
pq_sendint(&buf, 1, 2); /* 1 field */
/* Field header */
pq_sendstring(&buf, "recptr");
pq_sendint(&buf, 0, 4); /* table oid */
pq_sendint(&buf, 0, 2); /* attnum */
pq_sendint(&buf, TEXTOID, 4); /* type oid */
pq_sendint(&buf, -1, 2);
pq_sendint(&buf, 0, 4);
pq_sendint(&buf, 0, 2);
pq_endmessage(&buf);
/* Data row */
pq_beginmessage(&buf, 'D');
pq_sendint(&buf, 1, 2); /* number of columns */
pq_sendint(&buf, strlen(str), 4); /* length */
pq_sendbytes(&buf, str, strlen(str));
pq_endmessage(&buf);
/* Send a CommandComplete message */
pq_puttextmessage('C', "SELECT");
}
/*
* Inject a file with given name and content in the output tar stream.
*/

27
src/backend/replication/walsender.c
View File

@@ -258,19 +258,26 @@ IdentifySystem(void)
StringInfoData buf;
char sysid[32];
char tli[11];
char xpos[MAXFNAMELEN];
XLogRecPtr logptr;
/*
* Reply with a result set with one row, two columns. First col is system
* ID, and second is timeline ID
* Reply with a result set with one row, three columns. First col is system
* ID, second is timeline ID, and third is current xlog location.
*/
snprintf(sysid, sizeof(sysid), UINT64_FORMAT,
GetSystemIdentifier());
snprintf(tli, sizeof(tli), "%u", ThisTimeLineID);
logptr = GetInsertRecPtr();
snprintf(xpos, sizeof(xpos), "%X/%X",
logptr.xlogid, logptr.xrecoff);
/* Send a RowDescription message */
pq_beginmessage(&buf, 'T');
pq_sendint(&buf, 2, 2); /* 2 fields */
pq_sendint(&buf, 3, 2); /* 3 fields */
/* first field */
pq_sendstring(&buf, "systemid"); /* col name */
@@ -289,15 +296,27 @@ IdentifySystem(void)
pq_sendint(&buf, 4, 2); /* typlen */
pq_sendint(&buf, 0, 4); /* typmod */
pq_sendint(&buf, 0, 2); /* format code */
/* third field */
pq_sendstring(&buf, "xlogpos");
pq_sendint(&buf, 0, 4);
pq_sendint(&buf, 0, 2);
pq_sendint(&buf, TEXTOID, 4);
pq_sendint(&buf, -1, 2);
pq_sendint(&buf, 0, 4);
pq_sendint(&buf, 0, 2);
pq_endmessage(&buf);
/* Send a DataRow message */
pq_beginmessage(&buf, 'D');
pq_sendint(&buf, 2, 2); /* # of columns */
pq_sendint(&buf, 3, 2); /* # of columns */
pq_sendint(&buf, strlen(sysid), 4); /* col1 len */
pq_sendbytes(&buf, (char *) &sysid, strlen(sysid));
pq_sendint(&buf, strlen(tli), 4); /* col2 len */
pq_sendbytes(&buf, (char *) tli, strlen(tli));
pq_sendint(&buf, strlen(xpos), 4); /* col3 len */
pq_sendbytes(&buf, (char *) xpos, strlen(xpos));
pq_endmessage(&buf);
/* Send CommandComplete and ReadyForQuery messages */