greenplumn cdbdtxcontextinfo 源码

2022-08-18
浏览 (445)

greenplumn cdbdtxcontextinfo 代码

文件路径：/src/backend/cdb/cdbdtxcontextinfo.c

/*-------------------------------------------------------------------------
 *
 * cdbdtxcontextinfo.c
 *
 * Portions Copyright (c) 2007-2008, Greenplum inc
 * Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
 *
 *
 * IDENTIFICATION
 *	    src/backend/cdb/cdbdtxcontextinfo.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "cdb/cdbdistributedsnapshot.h"
#include "cdb/cdblocaldistribxact.h"
#include "cdb/cdbdtxcontextinfo.h"
#include "miscadmin.h"
#include "access/transam.h"
#include "cdb/cdbvars.h"
#include "cdb/cdbtm.h"
#include "access/xact.h"
#include "utils/guc.h"
#include "utils/session_state.h"

/*
 * process local cache used to identify "dispatch units"
 *
 * Note, this is only required because the dispatcher emits multiple statements (which will
 * correspond to multiple local-xids on the segments) under the same distributed-xid.
 *
 */
static uint32 syncCount = 1;

void
DtxContextInfo_CreateOnMaster(DtxContextInfo *dtxContextInfo, bool inCursor,
							  int txnOptions, Snapshot snapshot)
{
	int			i;
	CommandId	curcid = 0;

	if (snapshot)
		curcid = snapshot->curcid;

	DtxContextInfo_Reset(dtxContextInfo);

	dtxContextInfo->distributedXid = getDistributedTransactionId();
	if (dtxContextInfo->distributedXid != InvalidDistributedTransactionId)
		dtxContextInfo->curcid = curcid;

	/*
	 * When this is an extended query, all the dispatchs will go to
	 * the reader gangs, don't increase 'syncCount' so that all the
	 * dispatch could share the same snapshot created by 'gp_write_shared_snapshot'.
	 */
	dtxContextInfo->segmateSync = inCursor ? syncCount : ++syncCount;
	if (dtxContextInfo->segmateSync == (~(uint32)0))
		ereport(FATAL,
				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
				 errmsg("cannot have more than 2^32-2 commands in a session")));

	AssertImply(inCursor,
				dtxContextInfo->distributedXid != InvalidDistributedTransactionId &&
				gp_command_count == MySessionState->latestCursorCommandId);

	dtxContextInfo->cursorContext = inCursor;
	dtxContextInfo->nestingLevel = GetCurrentTransactionNestLevel();

	elog((Debug_print_full_dtm ? LOG : DEBUG5),
		 "DtxContextInfo_CreateOnMaster: created dtxcontext with dxid "UINT64_FORMAT" nestingLevel %d segmateSync %u/%u (current/cached)",
		 dtxContextInfo->distributedXid, dtxContextInfo->nestingLevel,
		 dtxContextInfo->segmateSync, syncCount);

	dtxContextInfo->haveDistributedSnapshot = false;
	if (snapshot && snapshot->haveDistribSnapshot)
	{
		DistributedSnapshot_Copy(&dtxContextInfo->distributedSnapshot,
								 &snapshot->distribSnapshotWithLocalMapping.ds);
		dtxContextInfo->haveDistributedSnapshot = true;
	}

	dtxContextInfo->distributedTxnOptions = txnOptions;

	if (DEBUG5 >= log_min_messages || Debug_print_full_dtm)
	{
		char		gid[TMGIDSIZE];
		DistributedSnapshot *ds = &dtxContextInfo->distributedSnapshot;

		if (!getDistributedTransactionIdentifier(gid))
			memcpy(gid, "<empty>", 8);

		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_CreateOnMaster Gp_role is DISPATCH and have gid = %s --> have distributed snapshot", gid);
		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_CreateOnMaster distributedXid = "UINT64_FORMAT", "
			 "distributedSnapshotHeader (xminAllDistributedSnapshots "UINT64_FORMAT", xmin = "UINT64_FORMAT", xmax = "UINT64_FORMAT", count = %d)",
			 dtxContextInfo->distributedXid,
			 ds->xminAllDistributedSnapshots,
			 ds->xmin,
			 ds->xmax,
			 ds->count);

		for (i = 0; i < ds->count; i++)
		{
			elog((Debug_print_full_dtm ? LOG : DEBUG5),
				 "....    distributedSnapshotData->xip[%d] = "UINT64_FORMAT,
				 i, ds->inProgressXidArray[i]);
		}
		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_CreateOnMaster curcid = %u",
			 dtxContextInfo->curcid);

		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_CreateOnMaster txnOptions = 0x%x, needDtx = %s, explicitBegin = %s, isoLevel = %s, readOnly = %s.",
			 txnOptions,
			 (isMppTxOptions_NeedDtx(txnOptions) ? "true" : "false"),
			 (isMppTxOptions_ExplicitBegin(txnOptions) ? "true" : "false"),
			 IsoLevelAsUpperString(mppTxOptions_IsoLevel(txnOptions)),
			 (isMppTxOptions_ReadOnly(txnOptions) ? "true" : "false"));
	}
}

int
DtxContextInfo_SerializeSize(DtxContextInfo *dtxContextInfo)
{
	int			size = 0;

	size += sizeof(DistributedTransactionId);	/* distributedXid */

	if (dtxContextInfo->distributedXid != InvalidDistributedTransactionId)
	{
		size += TMGIDSIZE;		/* distributedId */
		size += sizeof(CommandId);	/* curcid */
	}

	size += sizeof(uint32);		/* segmateSync */
	size += sizeof(uint32);		/* nestingLevel */
	size += sizeof(bool);		/* haveDistributedSnapshot */
	size += sizeof(bool);		/* cursorContext */

	if (dtxContextInfo->haveDistributedSnapshot)
	{
		size += DistributedSnapshot_SerializeSize(
												  &dtxContextInfo->distributedSnapshot);
	}

	size += sizeof(int);		/* distributedTxnOptions */

	elog((Debug_print_full_dtm ? LOG : DEBUG5),
		 "DtxContextInfo_SerializeSize is returning size = %d", size);

	return size;
}

void
DtxContextInfo_Serialize(char *buffer, DtxContextInfo *dtxContextInfo)
{
	char	   *p = buffer;
	int			i;
	int			used;
	DistributedSnapshot *ds = &dtxContextInfo->distributedSnapshot;

	memcpy(p, &dtxContextInfo->distributedXid, sizeof(DistributedTransactionId));
	p += sizeof(DistributedTransactionId);
	if (dtxContextInfo->distributedXid != InvalidDistributedTransactionId)
	{
		memcpy(p, &dtxContextInfo->curcid, sizeof(CommandId));
		p += sizeof(CommandId);
	}
	else
	{
		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_Serialize only copied InvalidDistributedTransactionId");
	}

	elog((Debug_print_full_dtm ? LOG : DEBUG3),
		 "DtxContextInfo_Serialize distributedXid = "UINT64_FORMAT", curcid %d nestingLevel %d segmateSync %u",
		 dtxContextInfo->distributedXid,
		 dtxContextInfo->curcid, dtxContextInfo->nestingLevel, dtxContextInfo->segmateSync);

	memcpy(p, &dtxContextInfo->segmateSync, sizeof(uint32));
	p += sizeof(uint32);

	memcpy(p, &dtxContextInfo->nestingLevel, sizeof(uint32));
	p += sizeof(uint32);

	memcpy(p, &dtxContextInfo->haveDistributedSnapshot, sizeof(bool));
	p += sizeof(bool);

	memcpy(p, &dtxContextInfo->cursorContext, sizeof(bool));
	p += sizeof(bool);

	if (dtxContextInfo->haveDistributedSnapshot)
	{
		p += DistributedSnapshot_Serialize(ds, p);
	}

	memcpy(p, &dtxContextInfo->distributedTxnOptions, sizeof(int));
	p += sizeof(int);

	used = (p - buffer);

	if (DEBUG5 >= log_min_messages || Debug_print_full_dtm || Debug_print_snapshot_dtm)
	{
		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_Serialize distributedXid = "UINT64_FORMAT", "
			 "curcid %d",
			 dtxContextInfo->distributedXid,
			 dtxContextInfo->curcid);

		if (dtxContextInfo->haveDistributedSnapshot)
		{
			elog((Debug_print_full_dtm ? LOG : DEBUG5),
				 "distributedSnapshotHeader (xminAllDistributedSnapshots "UINT64_FORMAT", xmin = "UINT64_FORMAT", xmax = "UINT64_FORMAT", count = %d)",
				 ds->xminAllDistributedSnapshots,
				 ds->xmin,
				 ds->xmax,
				 ds->count);
			for (i = 0; i < ds->count; i++)
			{
				elog((Debug_print_full_dtm ? LOG : DEBUG5),
					 "....    inProgressXidArray[%d] = "UINT64_FORMAT,
					 i, ds->inProgressXidArray[i]);
			}
			elog((Debug_print_snapshot_dtm ? LOG : DEBUG5),
				 "[Distributed Snapshot #%u] *Serialize* currcid = %d (gxid = "UINT64_FORMAT", '%s')",
				 ds->distribSnapshotId,
				 dtxContextInfo->curcid,
				 getDistributedTransactionId(),
				 DtxContextToString(DistributedTransactionContext));
		}
		elog((Debug_print_full_dtm ? LOG : DEBUG5), "DtxContextInfo_Serialize txnOptions = 0x%x", dtxContextInfo->distributedTxnOptions);
		elog((Debug_print_full_dtm ? LOG : DEBUG5), "DtxContextInfo_Serialize copied %d bytes", used);
	}
}

void
DtxContextInfo_Reset(DtxContextInfo *dtxContextInfo)
{
	dtxContextInfo->distributedXid = InvalidDistributedTransactionId;

	dtxContextInfo->curcid = 0;
	dtxContextInfo->segmateSync = 0;
	dtxContextInfo->nestingLevel = 0;

	dtxContextInfo->haveDistributedSnapshot = false;

	DistributedSnapshot_Reset(&dtxContextInfo->distributedSnapshot);

	dtxContextInfo->distributedTxnOptions = 0;
}

void
DtxContextInfo_Copy(
					DtxContextInfo *target,
					DtxContextInfo *source)
{
	DtxContextInfo_Reset(target);

	target->distributedXid = source->distributedXid;
	target->segmateSync = source->segmateSync;
	target->nestingLevel = source->nestingLevel;

	target->curcid = source->curcid;

	target->haveDistributedSnapshot = source->haveDistributedSnapshot;
	target->cursorContext = source->cursorContext;

	if (source->haveDistributedSnapshot)
		DistributedSnapshot_Copy(&target->distributedSnapshot,
								 &source->distributedSnapshot);

	target->distributedTxnOptions = source->distributedTxnOptions;

	elog((Debug_print_full_dtm ? LOG : DEBUG5),
		 "DtxContextInfo_Copy distributed {xid "UINT64_FORMAT"}, "
		 "command id %d",
		 target->distributedXid,
		 target->curcid);

	if (target->haveDistributedSnapshot)
		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "distributed snapshot {xminAllDistributedSnapshots "UINT64_FORMAT", snapshot id %d, "
			 "xmin "UINT64_FORMAT", count %d, xmax "UINT64_FORMAT"}",
			 target->distributedSnapshot.xminAllDistributedSnapshots,
			 target->distributedSnapshot.distribSnapshotId,
			 target->distributedSnapshot.xmin,
			 target->distributedSnapshot.count,
			 target->distributedSnapshot.xmax);

}

void
DtxContextInfo_Deserialize(const char *serializedDtxContextInfo,
						   int serializedDtxContextInfolen,
						   DtxContextInfo *dtxContextInfo)
{
	int			i;
	DistributedSnapshot *ds = &dtxContextInfo->distributedSnapshot;

	DtxContextInfo_Reset(dtxContextInfo);

	if (serializedDtxContextInfolen > 0)
	{
		const char *p = serializedDtxContextInfo;

		elog((Debug_print_full_dtm ? LOG : DEBUG5),
			 "DtxContextInfo_Deserialize serializedDtxContextInfolen = %d.",
			 serializedDtxContextInfolen);

		memcpy(&dtxContextInfo->distributedXid, p, sizeof(DistributedTransactionId));
		p += sizeof(DistributedTransactionId);

		if (dtxContextInfo->distributedXid != InvalidDistributedTransactionId)
		{
			memcpy(&dtxContextInfo->curcid, p, sizeof(CommandId));
			p += sizeof(CommandId);
		}
		else
		{
			elog((Debug_print_full_dtm ? LOG : DEBUG5),
				 "DtxContextInfo_Deserialize distributedXid was InvalidDistributedTransactionId");
		}

		memcpy(&dtxContextInfo->segmateSync, p, sizeof(uint32));
		p += sizeof(uint32);
		memcpy(&dtxContextInfo->nestingLevel, p, sizeof(uint32));
		p += sizeof(uint32);
		memcpy(&dtxContextInfo->haveDistributedSnapshot, p, sizeof(bool));
		p += sizeof(bool);

		memcpy(&dtxContextInfo->cursorContext, p, sizeof(bool));
		p += sizeof(bool);

		elog((Debug_print_full_dtm ? LOG : DEBUG3),
			 "DtxContextInfo_Deserialize distributedXid = "UINT64_FORMAT", curcid %d nestingLevel %d segmateSync %u as %s",
			 dtxContextInfo->distributedXid,
			 dtxContextInfo->curcid, dtxContextInfo->nestingLevel,
			 dtxContextInfo->segmateSync, (Gp_is_writer ? "WRITER" : "READER"));

		if (dtxContextInfo->haveDistributedSnapshot)
		{
			p += DistributedSnapshot_Deserialize(p, ds);
		}
		else
		{
			elog((Debug_print_full_dtm ? LOG : DEBUG5),
				 "DtxContextInfo_Deserialize no distributed snapshot");
		}

		memcpy(&dtxContextInfo->distributedTxnOptions, p, sizeof(int));
		p += sizeof(int);

		if (DEBUG5 >= log_min_messages || Debug_print_full_dtm)
		{
			elog((Debug_print_full_dtm ? LOG : DEBUG5),
				 "DtxContextInfo_Deserialize distributedXid = "UINT64_FORMAT,
				 dtxContextInfo->distributedXid);

			if (dtxContextInfo->haveDistributedSnapshot)
			{
				elog((Debug_print_full_dtm ? LOG : DEBUG5),
					 "distributedSnapshotHeader (xminAllDistributedSnapshots "UINT64_FORMAT", xmin = "UINT64_FORMAT", xmax = "UINT64_FORMAT", count = %d)",
					 ds->xminAllDistributedSnapshots,
					 ds->xmin,
					 ds->xmax,
					 ds->count);

				for (i = 0; i < ds->count; i++)
				{
					elog((Debug_print_full_dtm ? LOG : DEBUG5),
						 "....    inProgressXidArray[%d] = "UINT64_FORMAT,
						 i, ds->inProgressXidArray[i]);
				}

				elog((Debug_print_snapshot_dtm ? LOG : DEBUG5),
					 "[Distributed Snapshot #%u] *Deserialize* currcid = %d (gxid = "UINT64_FORMAT", '%s')",
					 ds->distribSnapshotId,
					 dtxContextInfo->curcid,
					 getDistributedTransactionId(),
					 DtxContextToString(DistributedTransactionContext));
			}

			elog((Debug_print_full_dtm ? LOG : DEBUG5),
				 "DtxContextInfo_Deserialize txnOptions = 0x%x",
				 dtxContextInfo->distributedTxnOptions);
		}
	}
	else
	{
		Assert(dtxContextInfo->distributedXid == InvalidDistributedTransactionId);
		Assert(dtxContextInfo->distributedTxnOptions == 0);
	}
}

相关信息

greenplumn 源码目录

相关文章

greenplumn cdbappendonlystorageformat 源码

greenplumn cdbappendonlystorageread 源码

greenplumn cdbappendonlystoragewrite 源码

greenplumn cdbappendonlyxlog 源码

greenplumn cdbbufferedappend 源码

greenplumn cdbbufferedread 源码

greenplumn cdbcat 源码

greenplumn cdbcopy 源码

greenplumn cdbdistributedsnapshot 源码

greenplumn cdbdistributedxacts 源码

0 赞

所属分类： 大数据
本文标签： greenplum
版权声明： 原创文章如转载，请注明本文链接: https://www.seaxiang.com/blog/d109be7641df46868c25ef1ba957827a

热门推荐

1、直接访问google.com
2、 - 优质文章
3、 gate.io
4、 harmony 鸿蒙hdc使用指导
5、 harmony 鸿蒙初识ArkTS语言
6、 harmony 鸿蒙ArkUI组件（ArkTS）开发常见问题
7、 flink kafka connector scan.startup.mode 的几个选项
8、 golang
9、 openharmony
10、 Vue中input框自动聚焦

Loading...