greenplumn distributedlogdesc 源码
greenplumn distributedlogdesc 代码
文件路径：/src/backend/access/rmgrdesc/distributedlogdesc.c
/*-------------------------------------------------------------------------
*
* distributedlogdesc.c
* rmgr descriptor routines for access/transam/distributedlog.c
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/access/rmgrdesc/distributedlogdesc.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/distributedlog.h"
void
DistributedLog_desc(StringInfo buf, XLogReaderState *record)
{
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
char *rec = XLogRecGetData(record);
if (info == DISTRIBUTEDLOG_ZEROPAGE)
{
int page;
memcpy(&page, rec, sizeof(int));
appendStringInfo(buf, "zeropage: %d", page);
}
else if (info == DISTRIBUTEDLOG_TRUNCATE)
{
int page;
memcpy(&page, rec, sizeof(int));
appendStringInfo(buf, "truncate before: %d", page);
}
else
appendStringInfo(buf, "UNKNOWN");
}
const char *
DistributedLog_identify(uint8 info)
{
const char *id = NULL;
switch (info & ~XLR_INFO_MASK)
{
case DISTRIBUTEDLOG_ZEROPAGE:
id = "DISTRIBUTEDLOG_ZEROPAGE";
break;
case DISTRIBUTEDLOG_TRUNCATE:
id = "DISTRIBUTEDLOG_TRUNCATE";
break;
}
return id;
}
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