greenplumn committsdesc 源码
greenplumn committsdesc 代码
文件路径：/src/backend/access/rmgrdesc/committsdesc.c
/*-------------------------------------------------------------------------
*
* committsdesc.c
* rmgr descriptor routines for access/transam/commit_ts.c
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/access/rmgrdesc/committsdesc.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/commit_ts.h"
#include "utils/timestamp.h"
void
commit_ts_desc(StringInfo buf, XLogReaderState *record)
{
char *rec = XLogRecGetData(record);
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
if (info == COMMIT_TS_ZEROPAGE)
{
int pageno;
memcpy(&pageno, rec, sizeof(int));
appendStringInfo(buf, "%d", pageno);
}
else if (info == COMMIT_TS_TRUNCATE)
{
xl_commit_ts_truncate *trunc = (xl_commit_ts_truncate *) rec;
appendStringInfo(buf, "pageno %d, oldestXid %u",
trunc->pageno, trunc->oldestXid);
}
else if (info == COMMIT_TS_SETTS)
{
xl_commit_ts_set *xlrec = (xl_commit_ts_set *) rec;
int nsubxids;
appendStringInfo(buf, "set %s/%d for: %u",
timestamptz_to_str(xlrec->timestamp),
xlrec->nodeid,
xlrec->mainxid);
nsubxids = ((XLogRecGetDataLen(record) - SizeOfCommitTsSet) /
sizeof(TransactionId));
if (nsubxids > 0)
{
int i;
TransactionId *subxids;
subxids = palloc(sizeof(TransactionId) * nsubxids);
memcpy(subxids,
XLogRecGetData(record) + SizeOfCommitTsSet,
sizeof(TransactionId) * nsubxids);
for (i = 0; i < nsubxids; i++)
appendStringInfo(buf, ", %u", subxids[i]);
pfree(subxids);
}
}
}
const char *
commit_ts_identify(uint8 info)
{
switch (info)
{
case COMMIT_TS_ZEROPAGE:
return "ZEROPAGE";
case COMMIT_TS_TRUNCATE:
return "TRUNCATE";
case COMMIT_TS_SETTS:
return "SETTS";
default:
return NULL;
}
}
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