greenplumn cdbappendonlystoragewrite 源码
greenplumn cdbappendonlystoragewrite 代码
文件路径：/src/backend/cdb/cdbappendonlystoragewrite.c
/*-------------------------------------------------------------------------
*
* cdbappendonlystoragewrite.c
*
* Portions Copyright (c) 2007-2009, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/backend/cdb/cdbappendonlystoragewrite.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#ifndef WIN32
#include <sys/fcntl.h>
#else
#include <io.h>
#endif
#include <sys/file.h>
#include <unistd.h>
#include "catalog/catalog.h"
#include "catalog/heap.h"
#include "catalog/pg_compression.h"
#include "cdb/cdbappendonlystorageread.h"
#include "cdb/cdbappendonlystorage.h"
#include "cdb/cdbappendonlystoragelayer.h"
#include "cdb/cdbappendonlystorageformat.h"
#include "cdb/cdbappendonlystoragewrite.h"
#include "cdb/cdbappendonlyxlog.h"
#include "common/relpath.h"
#include "pgstat.h"
#include "storage/gp_compress.h"
#include "utils/faultinjector.h"
#include "utils/guc.h"
/*----------------------------------------------------------------
* Initialization
*----------------------------------------------------------------
*/
/*
* Initialize AppendOnlyStorageWrite.
*
* The AppendOnlyStorageWrite data structure is initialized once for an
* append "session" and can be used to add Append-Only Storage Blocks to 1
* or more segment files.
*
* The current file to write to is opened with the
* AppendOnlyStorageWrite_OpenFile routine.
*
* storageWrite - data structure to initialize
* memoryContext - memory context to use for buffers and other memory
* needs. When NULL, the current memory context is used.
* maxBufferLen - maximum Append-Only Storage Block length including all
* storage headers.
* relationName - name of the relation to use in log and error messages.
* title - A phrase that better describes the purpose of this open.
* The caller manages the storage for this.
* storageAttributes - Append-Only Storage Attributes from relation creation.
*/
void
AppendOnlyStorageWrite_Init(AppendOnlyStorageWrite *storageWrite,
MemoryContext memoryContext,
int32 maxBufferLen,
char *relationName,
char *title,
AppendOnlyStorageAttributes *storageAttributes,
bool needsWAL)
{
uint8 *memory;
int32 memoryLen;
MemoryContext oldMemoryContext;
Assert(storageWrite != NULL);
/* UNDONE: Range check maxBufferLen */
Assert(relationName != NULL);
Assert(storageAttributes != NULL);
/* UNDONE: Range check fields in storageAttributes */
MemSet(storageWrite, 0, sizeof(AppendOnlyStorageWrite));
storageWrite->maxBufferLen = maxBufferLen;
if (memoryContext == NULL)
storageWrite->memoryContext = CurrentMemoryContext;
else
storageWrite->memoryContext = memoryContext;
oldMemoryContext = MemoryContextSwitchTo(storageWrite->memoryContext);
memcpy(
&storageWrite->storageAttributes,
storageAttributes,
sizeof(AppendOnlyStorageAttributes));
/*
* Determine the fixed header length based on the checksum flag.
*/
storageWrite->regularHeaderLen = AoHeader_RegularSize;
if (storageWrite->storageAttributes.checksum)
storageWrite->regularHeaderLen += 2 * sizeof(pg_crc32);
storageWrite->relationName = pstrdup(relationName);
storageWrite->title = title;
/*
* Set up extra buffers for compression.
*/
storageWrite->compressionOverrunLen = storageAttributes->overflowSize;
elog(DEBUG2, "Requested compression overflow bytes = %d.", storageAttributes->overflowSize);
if (storageWrite->storageAttributes.compress)
{
storageWrite->uncompressedBuffer = (uint8 *) palloc0(storageWrite->maxBufferLen * sizeof(uint8));
}
else
{
Assert(storageWrite->uncompressedBuffer == NULL);
}
/*
* Now that we have determined the compression overrun, we can initialize
* BufferedAppend with the correct maxBufferLen + compressionOverrunLen.
*/
storageWrite->maxBufferWithCompressionOverrrunLen =
storageWrite->maxBufferLen + storageWrite->compressionOverrunLen;
storageWrite->maxLargeWriteLen = 2 * storageWrite->maxBufferLen;
Assert(storageWrite->maxBufferWithCompressionOverrrunLen <= storageWrite->maxLargeWriteLen);
memoryLen = BufferedAppendMemoryLen
(
storageWrite->maxBufferWithCompressionOverrrunLen, /* maxBufferLen */
storageWrite->maxLargeWriteLen);
memory = (uint8 *) palloc(memoryLen);
BufferedAppendInit(&storageWrite->bufferedAppend,
memory,
memoryLen,
storageWrite->maxBufferWithCompressionOverrrunLen,
storageWrite->maxLargeWriteLen,
relationName);
elogif(Debug_appendonly_print_insert || Debug_appendonly_print_append_block, LOG,
"Append-Only Storage Write initialize for table '%s' (compression = %s, compression level %d, maximum buffer length %d, large write length %d)",
storageWrite->relationName,
(storageWrite->storageAttributes.compress ? "true" : "false"),
storageWrite->storageAttributes.compressLevel,
storageWrite->maxBufferWithCompressionOverrrunLen,
storageWrite->maxLargeWriteLen);
/*
* When doing VerifyBlock, allocate the extra buffers.
*/
if (gp_appendonly_verify_write_block && storageWrite->storageAttributes.compress)
{
storageWrite->verifyWriteBuffer = (uint8 *) palloc(storageWrite->maxBufferLen * sizeof(uint8));
}
else
{
Assert(storageWrite->verifyWriteBuffer == NULL);
}
storageWrite->file = -1;
storageWrite->formatVersion = -1;
storageWrite->needsWAL = needsWAL;
MemoryContextSwitchTo(oldMemoryContext);
storageWrite->isActive = true;
}
/*
* Finish using the AppendOnlyStorageWrite session created with ~Init.
*/
void
AppendOnlyStorageWrite_FinishSession(AppendOnlyStorageWrite *storageWrite)
{
MemoryContext oldMemoryContext;
if (!storageWrite->isActive)
return;
oldMemoryContext = MemoryContextSwitchTo(storageWrite->memoryContext);
/*
* UNDONE: This expects the MemoryContent to be what was used for the
* 'memory' in ~Init
*/
BufferedAppendFinish(&storageWrite->bufferedAppend);
if (storageWrite->relationName != NULL)
{
pfree(storageWrite->relationName);
storageWrite->relationName = NULL;
}
if (storageWrite->uncompressedBuffer != NULL)
{
pfree(storageWrite->uncompressedBuffer);
storageWrite->uncompressedBuffer = NULL;
}
if (storageWrite->verifyWriteBuffer != NULL)
{
pfree(storageWrite->verifyWriteBuffer);
storageWrite->verifyWriteBuffer = NULL;
}
if (storageWrite->segmentFileName != NULL)
{
pfree(storageWrite->segmentFileName);
storageWrite->segmentFileName = NULL;
}
if (storageWrite->compression_functions != NULL)
{
callCompressionDestructor(storageWrite->compression_functions[COMPRESSION_DESTRUCTOR], storageWrite->compressionState);
if (storageWrite->compressionState != NULL)
{
pfree(storageWrite->compressionState);
}
if (storageWrite->verifyWriteCompressionState != NULL)
{
callCompressionDestructor(storageWrite->compression_functions[COMPRESSION_DESTRUCTOR], storageWrite->verifyWriteCompressionState);
}
}
/* Deallocation is done. Go back to caller memory-context. */
MemoryContextSwitchTo(oldMemoryContext);
storageWrite->isActive = false;
}
/*----------------------------------------------------------------
* Open and FlushAndClose
*----------------------------------------------------------------
*/
/*
* Creates an on-demand Append-Only segment file under transaction.
*/
void
AppendOnlyStorageWrite_TransactionCreateFile(AppendOnlyStorageWrite *storageWrite,
RelFileNodeBackend *relFileNode,
int32 segmentFileNum)
{
Assert(segmentFileNum > 0);
/* The file might already exist. that's OK */
// WALREP_FIXME: Pass isRedo == true, so that you don't get an error if it
// exists already. That's currently OK, but in the future, other things
// might depend on the isRedo flag, like whether to WAL-log the creation.
smgrcreate_ao(*relFileNode, segmentFileNum, true);
/*
* Create a WAL record, so that the segfile is also created after crash or
* in possible standby server. Not strictly necessarily, because a 0-length
* segfile and a non-existent segfile are treated the same. But the
* gp_replica_check tool, to compare primary and mirror, will complain if
* a file exists in master but not in mirror, even if it's empty.
*/
if (storageWrite->needsWAL)
xlog_ao_insert(relFileNode->node, segmentFileNum, 0, NULL, 0);
}
/*
* Opens the next segment file to write. The file must already exist.
*
* This routine is responsible for seeking to the proper write location given
* the logical EOF.
*
* filePathName - name of the segment file to open.
* version - AO table format version the file is in.
* logicalEof - last committed write transaction's EOF value to use as
* the end of the segment file.
*/
void
AppendOnlyStorageWrite_OpenFile(AppendOnlyStorageWrite *storageWrite,
char *filePathName,
int version,
int64 logicalEof,
int64 fileLen_uncompressed,
RelFileNodeBackend *relFileNode,
int32 segmentFileNum)
{
File file;
MemoryContext oldMemoryContext;
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
Assert(filePathName != NULL);
/*
* Assume that we only write in the current latest format. (it's redundant
* to pass the version number as argument, currently)
*/
if (version != AORelationVersion_GetLatest())
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot write append-only table version %d", version)));
/*
* Open or create the file for write.
*/
char *path = aorelpath(*relFileNode, segmentFileNum);
errno = 0;
int fileFlags = O_RDWR | PG_BINARY;
file = PathNameOpenFile(path, fileFlags);
if (file < 0)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("Append-only Storage Write could not open segment file %s \"%s\" for relation \"%s\": %m",
path, filePathName,
storageWrite->relationName)));
/*
* Seek to the logical EOF write position.
*/
storageWrite->file = file;
storageWrite->formatVersion = version;
storageWrite->startEof = logicalEof;
storageWrite->relFileNode = *relFileNode;
storageWrite->segmentFileNum = segmentFileNum;
/*
* When writing multiple segment files, we throw away the old segment file
* name strings.
*/
oldMemoryContext = MemoryContextSwitchTo(storageWrite->memoryContext);
if (storageWrite->segmentFileName != NULL)
pfree(storageWrite->segmentFileName);
storageWrite->segmentFileName = pstrdup(filePathName);
/* Allocation is done. Go back to caller memory-context. */
MemoryContextSwitchTo(oldMemoryContext);
/*
* Tell the BufferedAppend module about the file we just opened.
*/
BufferedAppendSetFile(&storageWrite->bufferedAppend,
storageWrite->file,
storageWrite->relFileNode,
storageWrite->segmentFileNum,
storageWrite->segmentFileName,
logicalEof,
fileLen_uncompressed);
}
/*
* Optionally pad out to next page boundary.
*
* Since we do not do typical recovery processing of append-only file-system
* pages, we pad out the last file-system byte with zeroes. The number of
* bytes that are padded with zero's is determined by safefswritesize.
* This function pads with 0's of length padLen or pads the whole remainder
* of the safefswritesize size with 0's if padLen is -1.
*/
static void
AppendOnlyStorageWrite_DoPadOutRemainder(AppendOnlyStorageWrite *storageWrite,
int32 padLen)
{
int64 nextWritePosition;
int64 nextBoundaryPosition;
int32 safeWrite = storageWrite->storageAttributes.safeFSWriteSize;
int32 safeWriteRemainder;
bool doPad;
uint8 *buffer;
/* early exit if no pad needed */
if (safeWrite == 0)
return;
nextWritePosition = BufferedAppendNextBufferPosition(&storageWrite->bufferedAppend);
nextBoundaryPosition =
((nextWritePosition + safeWrite - 1) / safeWrite) * safeWrite;
safeWriteRemainder = (int32) (nextBoundaryPosition - nextWritePosition);
if (safeWriteRemainder <= 0)
doPad = false;
else if (padLen == -1)
{
/*
* Pad to end of page.
*/
doPad = true;
}
else
doPad = (safeWriteRemainder < padLen);
if (doPad)
{
/*
* Get buffer of the remainder to pad.
*/
buffer = BufferedAppendGetBuffer(&storageWrite->bufferedAppend,
safeWriteRemainder);
if (buffer == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("We do not expect files to be have a maximum length")));
}
memset(buffer, 0, safeWriteRemainder);
BufferedAppendFinishBuffer(&storageWrite->bufferedAppend,
safeWriteRemainder,
safeWriteRemainder,
storageWrite->needsWAL);
elogif(Debug_appendonly_print_insert, LOG,
"Append-only insert zero padded safeWriteRemainder for table '%s' (nextWritePosition = " INT64_FORMAT ", safeWriteRemainder = %d)",
storageWrite->relationName,
nextWritePosition,
safeWriteRemainder);
}
}
/*
* Flush and close the current segment file.
*
* No error if the current is already closed.
*
* The new EOF of the segment file is returend in *newLogicalEof.
*/
void
AppendOnlyStorageWrite_FlushAndCloseFile(
AppendOnlyStorageWrite *storageWrite,
int64 *newLogicalEof,
int64 *fileLen_uncompressed)
{
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
if (storageWrite->file == -1)
{
*newLogicalEof = 0;
*fileLen_uncompressed = 0;
return;
}
/*
* We pad out append commands to the page boundary.
*/
AppendOnlyStorageWrite_DoPadOutRemainder(
storageWrite,
/* indicate till end of page */ -1);
/*
* Have the BufferedAppend module let go, but this does not close the
* file.
*/
BufferedAppendCompleteFile(&storageWrite->bufferedAppend,
newLogicalEof,
fileLen_uncompressed,
storageWrite->needsWAL);
/*
* We must take care of fsynching to disk ourselves since a fsync request
* is not enqueued for an AO segment file that is written to disk on
* primary. Temp tables are not crash safe, no need to fsync them.
*/
if (!RelFileNodeBackendIsTemp(storageWrite->relFileNode) &&
FileSync(storageWrite->file, WAIT_EVENT_DATA_FILE_SYNC) != 0)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("Could not flush (fsync) Append-Only segment file '%s' to disk for relation '%s': %m",
storageWrite->segmentFileName,
storageWrite->relationName)));
FileClose(storageWrite->file);
storageWrite->file = -1;
storageWrite->formatVersion = -1;
MemSet(&storageWrite->relFileNode, 0, sizeof(RelFileNode));
storageWrite->segmentFileNum = 0;
}
/*
* Flush and close the current segment file under a transaction.
*
* Handles mirror loss end transaction work.
*
* No error if the current is already closed.
*
* The new EOF of the segment file is returned in *newLogicalEof.
*/
void
AppendOnlyStorageWrite_TransactionFlushAndCloseFile(AppendOnlyStorageWrite *storageWrite,
int64 *newLogicalEof,
int64 *fileLen_uncompressed)
{
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
if (storageWrite->file == -1)
{
*newLogicalEof = 0;
*fileLen_uncompressed = 0;
return;
}
AppendOnlyStorageWrite_FlushAndCloseFile(storageWrite,
newLogicalEof,
fileLen_uncompressed);
}
/*----------------------------------------------------------------
* Usable Block Length
*----------------------------------------------------------------
*/
/*
* When writing "short" content intended to stay within the maxBufferLen (also
* known as blocksize), some of the buffer will be used for the Append-Only
* Block Header. This function returns that overhead length.
*
* Isn't the length of the Append-Only Storage Block constant? NO.
*
* Currently, there are two things that can make it longer. When checksums
* are configured, we add checksum data to the header. And there is optional
* header data (e.g. firstRowNum).
*
* We call the header portion with the optional checksums the fixed header
* because we need to be able to read and evaluate the checksums before we can
* interpret flags in the fixed header that indicate there is more header
* information.
*
* The complete header length is the fixed header plus optional information.
*/
/*
* Returns the Append-Only Storage Block complete header length in bytes.
*
* Call this routine after specifying all optional header information for the current block
* begin written.
*/
int32
AppendOnlyStorageWrite_CompleteHeaderLen(AppendOnlyStorageWrite *storageWrite,
AoHeaderKind aoHeaderKind)
{
int32 completeHeaderLen;
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
completeHeaderLen = storageWrite->regularHeaderLen;
if (AoHeader_IsLong(aoHeaderKind))
{
completeHeaderLen += (AoHeader_LongSize - AoHeader_RegularSize);
}
if (storageWrite->isFirstRowNumSet)
completeHeaderLen += sizeof(int64);
return completeHeaderLen;
}
/*
* Returns the Append-Only Storage large content metadata header length in
* bytes.
*
* Call this routine after specifying all optional header information for the
* current block begin written.
*/
static int32
AppendOnlyStorageWrite_LargeContentHeaderLen(AppendOnlyStorageWrite *storageWrite)
{
int32 completeHeaderLen;
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
completeHeaderLen = storageWrite->regularHeaderLen;
if (storageWrite->isFirstRowNumSet)
completeHeaderLen += sizeof(int64);
/* UNDONE: Right alignment? */
return completeHeaderLen;
}
char *
AppendOnlyStorageWrite_ContextStr(AppendOnlyStorageWrite *storageWrite)
{
int64 headerOffsetInFile =
BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend);
return psprintf("%s. Append-Only segment file '%s', header offset in file " INT64_FORMAT,
storageWrite->title,
storageWrite->segmentFileName,
headerOffsetInFile);
}
static char *
AppendOnlyStorageWrite_BlockHeaderStr(AppendOnlyStorageWrite *storageWrite,
uint8 *header)
{
return AppendOnlyStorageFormat_BlockHeaderStr(header,
storageWrite->storageAttributes.checksum,
storageWrite->formatVersion);
}
static void
AppendOnlyStorageWrite_LogBlockHeader(AppendOnlyStorageWrite *storageWrite,
int64 headerOffsetInFile,
uint8 *header)
{
char *blockHeaderStr;
blockHeaderStr = AppendOnlyStorageWrite_BlockHeaderStr(storageWrite,
header);
ereport(LOG,
(errmsg("%s. Append-Only segment file '%s', header offset in file " INT64_FORMAT ". %s",
storageWrite->title,
storageWrite->segmentFileName,
headerOffsetInFile,
blockHeaderStr)));
pfree(blockHeaderStr);
}
/*----------------------------------------------------------------
* errcontext and errdetail
*----------------------------------------------------------------
*/
/*
* errcontext_appendonly_write_storage_block
*
* Add an errcontext() line showing the table, segment file, offset in file,
* block count of the storage block being read.
*/
static int
errcontext_appendonly_write_storage_block(AppendOnlyStorageWrite *storageWrite)
{
int64 headerOffsetInFile;
headerOffsetInFile = BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend);
errcontext("Append-Only table '%s', segment file '%s', block header offset in file = " INT64_FORMAT ", bufferCount " INT64_FORMAT ")",
storageWrite->relationName,
storageWrite->segmentFileName,
headerOffsetInFile,
storageWrite->bufferCount);
return 0;
}
/*
* errdetail_appendonly_write_storage_block_header
*
* Add an errdetail() line showing the Append-Only Storage header being written.
*/
static void
errdetail_appendonly_write_storage_block_header(AppendOnlyStorageWrite *storageWrite)
{
uint8 *header;
bool checksum;
int version;
header = BufferedAppendGetCurrentBuffer(&storageWrite->bufferedAppend);
checksum = storageWrite->storageAttributes.checksum;
version = storageWrite->formatVersion;
errdetail_appendonly_storage_smallcontent_header(header, checksum,
version);
}
/*----------------------------------------------------------------
* Writing Small Content Efficiently that is not being Bulk Compressed
*----------------------------------------------------------------
*/
/*
* This section describes for writing content that is less than or equal to
* the blocksize (e.g. 32k) bytes that is not being bulk compressed by the
* Append-Only Storage Layer.
*
* Actually, the content is limited to blocksize minus the Append-Only header
* size (see the AppendOnlyStorageWrite_HeaderLen routine).
*/
/*
* Get a pointer to next maximum length buffer space for
* appending small content.
*
* You must decide whether you are supplying the optional first row number
* BEFORE calling this routine!
*
* NOTE: The maximum length buffer space =
* maxBufferLen +
* AppendOnlyStorageWrite_CompleteHeaderLen(...)
*
* When compression is not being used, this interface provides a pointer
* directly into the write buffer for efficient data generation. Otherwise,
* a pointer to a temporary buffer to collect the uncompressed contents will
* be provided.
*
* Returns NULL when the current file does not have enough room for another
* buffer.
*/
uint8 *
AppendOnlyStorageWrite_GetBuffer(AppendOnlyStorageWrite *storageWrite,
int aoHeaderKind)
{
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
Assert(aoHeaderKind == AoHeaderKind_SmallContent ||
aoHeaderKind == AoHeaderKind_NonBulkDenseContent ||
aoHeaderKind == AoHeaderKind_BulkDenseContent);
storageWrite->getBufferAoHeaderKind = aoHeaderKind;
/*
* Both headers (Small and NonBulkDense) have the same length. BulkDense
* is a long header.
*/
storageWrite->currentCompleteHeaderLen =
AppendOnlyStorageWrite_CompleteHeaderLen(
storageWrite,
aoHeaderKind);
/*
* If compression configured, the supply the temporary buffer instead.
*/
if (storageWrite->storageAttributes.compress)
{
storageWrite->currentBuffer = NULL;
return storageWrite->uncompressedBuffer;
}
else
{
storageWrite->currentBuffer =
BufferedAppendGetMaxBuffer(&storageWrite->bufferedAppend);
return &storageWrite->currentBuffer[storageWrite->currentCompleteHeaderLen];
}
}
/*
* Test if a buffer is currently allocated.
*/
bool
AppendOnlyStorageWrite_IsBufferAllocated(AppendOnlyStorageWrite *storageWrite)
{
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
return (storageWrite->currentCompleteHeaderLen > 0);
}
/*
* Return the beginning of the last write position of the write buffer.
*/
int64
AppendOnlyStorageWrite_LogicalBlockStartOffset(AppendOnlyStorageWrite *storageWrite)
{
return storageWrite->logicalBlockStartOffset;
}
static void
AppendOnlyStorageWrite_VerifyWriteBlock(AppendOnlyStorageWrite *storageWrite,
int64 headerOffsetInFile,
int32 bufferLen,
uint8 *expectedContent,
int32 expectedUncompressedLen,
int expectedExecutorBlockKind,
int expectedRowCount,
int32 expectedCompressedLen)
{
uint8 *header;
AOHeaderCheckError checkError;
AoHeaderKind headerKind;
int32 actualHeaderLen;
int32 offset;
int32 uncompressedLen = 0;
bool isCompressed = false;
int32 overallBlockLen;
int32 compressedLen = 0;
int executorBlockKind = 0;
bool hasFirstRowNum;
int64 firstRowNum;
int rowCount = 0;
pg_crc32 storedChecksum;
pg_crc32 computedChecksum;
if (storageWrite->storageAttributes.compress && storageWrite->verifyWriteBuffer == NULL)
return; /* GUC must have been turned on
* mid-transaction. */
if (gp_appendonly_verify_write_block == false)
elog(WARNING, "The GUC gp_appendonly_verify_write_block is false. Compressed write not checked.");
header = BufferedAppendGetCurrentBuffer(&storageWrite->bufferedAppend);
/*
* Code is similar to that in getNextStorageBlockInFile routine.
*/
/*----------
* Proceed very carefully:
* [ 1. Verify header checksum ]
* 2. Examine (basic) header.
* 3. Examine specific header.
* [ 4. Verify the block checksum ]
*----------
*/
if (storageWrite->storageAttributes.checksum)
{
if (!AppendOnlyStorageFormat_VerifyHeaderChecksum(
header,
&storedChecksum,
&computedChecksum))
ereport(ERROR,
(errmsg("Verify block during write found header checksum does not match. Expected 0x%08X and found 0x%08X",
storedChecksum,
computedChecksum),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
}
/*
* Check the (basic) header information.
*/
checkError = AppendOnlyStorageFormat_GetHeaderInfo(
header,
storageWrite->storageAttributes.checksum,
&headerKind,
&actualHeaderLen);
if (checkError != AOHeaderCheckOk)
ereport(ERROR,
(errmsg("Verify block during write found bad append-only storage header. Header check error %d, detail '%s'",
(int) checkError,
AppendOnlyStorageFormat_GetHeaderCheckErrorStr()),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
switch (headerKind)
{
case AoHeaderKind_SmallContent:
/*
* Check the Block header information.
*/
checkError = AppendOnlyStorageFormat_GetSmallContentHeaderInfo(header,
actualHeaderLen,
storageWrite->storageAttributes.checksum,
bufferLen,
&overallBlockLen,
&offset, //Offset to data.
& uncompressedLen,
&executorBlockKind,
&hasFirstRowNum,
storageWrite->formatVersion,
&firstRowNum,
&rowCount,
&isCompressed,
&compressedLen);
break;
case AoHeaderKind_LargeContent:
/*
* Check the LargeContent header information.
*/
checkError = AppendOnlyStorageFormat_GetLargeContentHeaderInfo(header,
actualHeaderLen,
storageWrite->storageAttributes.checksum,
&uncompressedLen,
&executorBlockKind,
&hasFirstRowNum,
&firstRowNum,
&rowCount);
break;
case AoHeaderKind_NonBulkDenseContent:
checkError = AppendOnlyStorageFormat_GetNonBulkDenseContentHeaderInfo(header,
actualHeaderLen,
storageWrite->storageAttributes.checksum,
bufferLen,
&overallBlockLen,
&offset, //Offset to data.
&uncompressedLen,
&executorBlockKind,
&hasFirstRowNum,
storageWrite->formatVersion,
&firstRowNum,
&rowCount);
break;
case AoHeaderKind_BulkDenseContent:
checkError = AppendOnlyStorageFormat_GetBulkDenseContentHeaderInfo(header,
actualHeaderLen,
storageWrite->storageAttributes.checksum,
bufferLen,
&overallBlockLen,
&offset, //Offset to data.
&uncompressedLen,
&executorBlockKind,
&hasFirstRowNum,
storageWrite->formatVersion,
&firstRowNum,
&rowCount,
&isCompressed,
&compressedLen);
break;
default:
elog(ERROR, "Unexpected Append-Only header kind %d",
headerKind);
break;
}
if (checkError != AOHeaderCheckOk)
ereport(ERROR,
(errmsg("Verify block during write found bad append-only storage block header. Block type: %d "
"Header check error %d, detail '%s'",
headerKind,
(int) checkError,
AppendOnlyStorageFormat_GetHeaderCheckErrorStr()),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
if (uncompressedLen != expectedUncompressedLen)
ereport(ERROR,
(errmsg("Verify block during write found append-only storage block header. "
"DataLen %d does not equal expected length %d, ",
uncompressedLen,
expectedUncompressedLen),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
if (compressedLen != expectedCompressedLen)
ereport(ERROR,
(errmsg("Verify block during write found append-only storage block header. "
"CompressedLen %d does not equal expected length %d",
compressedLen,
expectedCompressedLen),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
/*
* Now verify the executor portion of the block.
*/
if (executorBlockKind != expectedExecutorBlockKind)
ereport(ERROR,
(errmsg("Verify block during write found append-only storage block header. "
"ExecutorBlockKind %d does not equal expected value %d.",
executorBlockKind,
expectedExecutorBlockKind),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
/* UNDONE: Check hasFirstRowNum */
if (rowCount != expectedRowCount)
ereport(ERROR,
(errmsg("Verify block during write found append-only storage block header. "
"RowCount %d does not equal expected value %d",
rowCount,
expectedRowCount),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
if (Debug_appendonly_print_verify_write_block)
{
AppendOnlyStorageWrite_LogBlockHeader(storageWrite,
headerOffsetInFile,
header);
}
if (isCompressed)
{
int test;
PGFunction decompressor;
PGFunction *cfns = storageWrite->compression_functions;
Assert(gp_appendonly_verify_write_block == true);
Assert(storageWrite->verifyWriteCompressionState != NULL);
if (cfns == NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("decompression information missing")));
decompressor = cfns[COMPRESSION_DECOMPRESS];
gp_decompress(&header[offset], //Compressed data in block.
compressedLen,
storageWrite->verifyWriteBuffer, //Temporary buffer to hold uncompressed data.
uncompressedLen,
decompressor,
storageWrite->verifyWriteCompressionState,
storageWrite->bufferCount);
/*
* Compare.
*/
test = memcmp(expectedContent,
storageWrite->verifyWriteBuffer,
uncompressedLen);
if (test != 0)
ereport(ERROR,
(errmsg("Verify block during write found decompress did not produce the exact same bits passed to compress! "
"Memcmp result %d",
test),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
}
else
{
/* UNDONE: Do comparison here */
}
#ifdef NeedCallBack
if (executorBlockKind == AoExecutorBlockKind_VarBlock)
{
VarBlockCheckError varBlockCheckError;
VarBlockReader varBlockReader;
int readerItemCount;
varBlockCheckError = VarBlockIsValid(data, uncompressedLen);
if (varBlockCheckError != VarBlockCheckOk)
ereport(ERROR,
(errmsg("Verify block during write found VarBlock is not valid "
"Valid block check error %d, detail '%s'",
varBlockCheckError,
VarBlockGetCheckErrorStr()),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
/*
* Now use the VarBlock module to extract the items out.
*/
VarBlockReaderInit(&varBlockReader,
data,
uncompressedLen);
readerItemCount = VarBlockReaderItemCount(&varBlockReader);
if (rowCount != readerItemCount)
{
ereport(ERROR,
(errmsg("Verify block during write found row count %d in append-only storage header does not match VarBlock item count %d",
rowCount,
readerItemCount),
errdetail_appendonly_write_storage_block_header(storageWrite),
errcontext_appendonly_write_storage_block(storageWrite)));
}
}
#endif
}
static void
AppendOnlyStorageWrite_CompressAppend(AppendOnlyStorageWrite *storageWrite,
uint8 *sourceData,
int32 sourceLen,
int executorBlockKind,
int itemCount,
int32 *compressedLen,
int32 *bufferLen)
{
uint8 *header;
uint8 *dataBuffer;
int32 dataBufferWithOverrrunLen;
PGFunction *cfns = storageWrite->compression_functions;
PGFunction compressor;
if (cfns == NULL)
compressor = NULL;
else
compressor = cfns[COMPRESSION_COMPRESS];
/* UNDONE: This can be a duplicate call... */
storageWrite->currentCompleteHeaderLen =
AppendOnlyStorageWrite_CompleteHeaderLen(
storageWrite,
storageWrite->getBufferAoHeaderKind);
header = BufferedAppendGetMaxBuffer(&storageWrite->bufferedAppend);
if (header == NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("We do not expect files to be have a maximum length"),
errcontext_appendonly_write_storage_block(storageWrite)));
dataBuffer = &header[storageWrite->currentCompleteHeaderLen];
dataBufferWithOverrrunLen =
storageWrite->maxBufferWithCompressionOverrrunLen
- storageWrite->currentCompleteHeaderLen;
/*
* Compress into the BufferedAppend buffer after the large header (and
* optional checksum, etc.
*/
gp_trycompress(sourceData,
sourceLen,
dataBuffer,
dataBufferWithOverrrunLen,
compressedLen,
compressor,
storageWrite->compressionState);
#ifdef FAULT_INJECTOR
/* Simulate that compression is not possible if the fault is set. */
if (FaultInjector_InjectFaultIfSet(
"appendonly_skip_compression",
DDLNotSpecified,
"",
storageWrite->relationName) == FaultInjectorTypeSkip)
{
*compressedLen = sourceLen + 1;
}
#endif
/*
* We always store the data compressed if the compressed length is less
* than the uncompressed length.
*
* TODO: this is a weak assumption. It doesn't account for the fact that
* it's not worth paying the CPU cost of decompression for a potentially
* trivial saving.
*
* The best solution to this seems to be to make the threshold at which we
* compress data user configurable.
*/
int32 dataLen = *compressedLen;
if (*compressedLen >= sourceLen)
{
dataLen = sourceLen;
memcpy(dataBuffer, sourceData, sourceLen);
*compressedLen = 0;
}
int32 dataRoundedUpLen =
AOStorage_RoundUp(dataLen, storageWrite->formatVersion);
AOStorage_ZeroPad(dataBuffer, dataLen, dataRoundedUpLen);
/* Make the header and compute the checksum if necessary. */
switch (storageWrite->getBufferAoHeaderKind)
{
case AoHeaderKind_SmallContent:
AppendOnlyStorageFormat_MakeSmallContentHeader
(header,
storageWrite->storageAttributes.checksum,
storageWrite->isFirstRowNumSet,
storageWrite->formatVersion,
storageWrite->firstRowNum,
executorBlockKind,
itemCount,
sourceLen,
*compressedLen);
break;
case AoHeaderKind_BulkDenseContent:
/*
* This header is used when compresslevel > 1 is specified with
* rle_type compression. The sourceData is already encoded with
* RLE. It is further compressed with bulk compression.
* Corresponding datumstream version is
* DatumStreamVersion_Dense_Enhanced.
*/
AppendOnlyStorageFormat_MakeBulkDenseContentHeader
(header,
storageWrite->storageAttributes.checksum,
storageWrite->isFirstRowNumSet,
storageWrite->formatVersion,
storageWrite->firstRowNum,
executorBlockKind,
itemCount,
sourceLen,
*compressedLen);
break;
default:
elog(ERROR, "unexpected Append-Only header kind %d",
storageWrite->getBufferAoHeaderKind);
break;
}
if (Debug_appendonly_print_storage_headers)
{
AppendOnlyStorageWrite_LogBlockHeader(
storageWrite,
BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend),
header);
}
elogif(Debug_appendonly_print_insert, LOG,
"Append-only insert block for table '%s' stored %s "
"(segment file '%s', header offset in file " INT64_FORMAT ", "
"source length = %d, result length %d item count %d, block count "
INT64_FORMAT ")",
storageWrite->relationName,
(*compressedLen > 0) ? "compressed" : "uncompressed",
storageWrite->segmentFileName,
BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend),
sourceLen,
dataLen,
itemCount,
storageWrite->bufferCount);
*bufferLen = storageWrite->currentCompleteHeaderLen + dataRoundedUpLen;
}
/*
* Mark the current buffer "small" buffer as finished.
*
* If compression is configured, we will try to compress the contents in
* the temporary uncompressed buffer into the write buffer.
*
* The buffer can be scheduled for writing and reused.
*
* contentLen - byte length of the content generated directly into the
* buffer returned by AppendOnlyStorageWrite_GetBuffer.
* executorBlockKind - A value defined externally by the executor that
* describes in content stored in the Append-Only Storage
* Block.
* rowCount - number of rows stored in the content.
*/
void
AppendOnlyStorageWrite_FinishBuffer(AppendOnlyStorageWrite *storageWrite,
int32 contentLen,
int executorBlockKind,
int rowCount)
{
int64 headerOffsetInFile;
int32 bufferLen;
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
Assert(storageWrite->currentCompleteHeaderLen > 0);
if (contentLen >
storageWrite->maxBufferLen - storageWrite->currentCompleteHeaderLen)
elog(ERROR,
"Append-only content too large AO storage block (table '%s', "
"content length = %d, maximum buffer length %d, complete header length %d, first row number is set %s)",
storageWrite->relationName,
contentLen,
storageWrite->maxBufferLen,
storageWrite->currentCompleteHeaderLen,
(storageWrite->isFirstRowNumSet ? "true" : "false"));
headerOffsetInFile = BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend);
if (!storageWrite->storageAttributes.compress)
{
uint8 *nonCompressedHeader;
uint8 *nonCompressedData;
int32 dataRoundedUpLen;
int32 uncompressedlen;
nonCompressedHeader = storageWrite->currentBuffer;
nonCompressedData = &nonCompressedHeader[storageWrite->currentCompleteHeaderLen];
dataRoundedUpLen = AOStorage_RoundUp(contentLen, storageWrite->formatVersion);
AOStorage_ZeroPad(
nonCompressedData,
contentLen,
dataRoundedUpLen);
switch (storageWrite->getBufferAoHeaderKind)
{
case AoHeaderKind_SmallContent:
/*
* Make the header and compute the checksum if necessary.
*/
AppendOnlyStorageFormat_MakeSmallContentHeader
(nonCompressedHeader,
storageWrite->storageAttributes.checksum,
storageWrite->isFirstRowNumSet,
storageWrite->formatVersion,
storageWrite->firstRowNum,
executorBlockKind,
rowCount,
contentLen,
/* compressedLength */ 0);
break;
case AoHeaderKind_NonBulkDenseContent:
/*
* Make the header and compute the checksum if necessary.
*/
AppendOnlyStorageFormat_MakeNonBulkDenseContentHeader
(nonCompressedHeader,
storageWrite->storageAttributes.checksum,
storageWrite->isFirstRowNumSet,
storageWrite->formatVersion,
storageWrite->firstRowNum,
executorBlockKind,
rowCount,
contentLen);
break;
default:
elog(ERROR, "Unexpected Append-Only header kind %d",
storageWrite->getBufferAoHeaderKind);
break;
}
if (Debug_appendonly_print_storage_headers)
{
AppendOnlyStorageWrite_LogBlockHeader(storageWrite,
headerOffsetInFile,
nonCompressedHeader);
}
bufferLen = storageWrite->currentCompleteHeaderLen + dataRoundedUpLen;
uncompressedlen = bufferLen; /* since there's no compression.. */
/*
* Just before finishing the AO Storage buffer with our non-compressed
* content, let's verify it.
*/
if (gp_appendonly_verify_write_block)
AppendOnlyStorageWrite_VerifyWriteBlock(storageWrite,
headerOffsetInFile,
bufferLen,
nonCompressedData,
contentLen,
executorBlockKind,
rowCount,
/* expectedCompressedLen */ 0);
BufferedAppendFinishBuffer(&storageWrite->bufferedAppend,
bufferLen,
uncompressedlen,
storageWrite->needsWAL);
/* Declare it finished. */
storageWrite->currentCompleteHeaderLen = 0;
elogif(Debug_appendonly_print_insert, LOG,
"Append-only insert finished uncompressed block for table '%s' "
"(length = %d, executor block kind %d, item count %d, block count " INT64_FORMAT ")",
storageWrite->relationName,
contentLen,
executorBlockKind,
rowCount,
storageWrite->bufferCount);
}
else
{
int32 compressedLen = 0;
AppendOnlyStorageWrite_CompressAppend(storageWrite,
storageWrite->uncompressedBuffer,
contentLen,
executorBlockKind,
rowCount,
&compressedLen,
&bufferLen);
/*
* Just before finishing the AO Storage buffer with our non-compressed
* content, let's verify it.
*/
if (gp_appendonly_verify_write_block)
AppendOnlyStorageWrite_VerifyWriteBlock(storageWrite,
headerOffsetInFile,
bufferLen,
storageWrite->uncompressedBuffer,
contentLen,
executorBlockKind,
rowCount,
compressedLen);
/*
* Finish the current buffer by specifying the used length.
*/
BufferedAppendFinishBuffer(&storageWrite->bufferedAppend,
bufferLen,
(storageWrite->currentCompleteHeaderLen +
AOStorage_RoundUp(contentLen, storageWrite->formatVersion) /* non-compressed size */ ),
storageWrite->needsWAL);
/* Declare it finished. */
storageWrite->currentCompleteHeaderLen = 0;
}
Assert(storageWrite->currentCompleteHeaderLen == 0);
storageWrite->currentBuffer = NULL;
storageWrite->isFirstRowNumSet = false;
}
/*
* Cancel the last ~GetBuffer call.
*
* This will also turn off the firstRowNum flag.
*/
void
AppendOnlyStorageWrite_CancelLastBuffer(
AppendOnlyStorageWrite *storageWrite)
{
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
Assert(storageWrite->currentCompleteHeaderLen > 0);
if (storageWrite->currentBuffer != NULL)
{
BufferedAppendCancelLastBuffer(&storageWrite->bufferedAppend);
storageWrite->currentBuffer = NULL;
}
storageWrite->currentCompleteHeaderLen = 0;
/*
* Since we don't know if AppendOnlyStorageWrite_Content will be called
* next or the writer is doing something else, let's turn off the
* firstRowNum flag.
*/
storageWrite->isFirstRowNumSet = false;
}
/*----------------------------------------------------------------
* Writing "Large" Content
*----------------------------------------------------------------
*/
/*
* This section describes for writing long content that can be up to 1 Gb
* long and/or content that will be bulk-compressed when configured.
*/
/*
* Write content up to 1Gb.
*
* Large content will be writen in fragment blocks by the Append-Only
* Storage Layer.
*
* If compression is configured, then the content will be compressed in
* fragments.
*
* Returns NULL when the current file does not have enough room for another
* buffer.
*
* content - Content to store. All contiguous.
* contentLen - byte length of the data to store.
* executorBlockKind - a value defined externally by the executor that
* describes in content stored in the Append-Only Storage
* Block.
* rowCount - number of rows stored in the content.
*/
void
AppendOnlyStorageWrite_Content(AppendOnlyStorageWrite *storageWrite,
uint8 *content,
int32 contentLen,
int executorBlockKind,
int rowCount)
{
int32 completeHeaderLen;
int32 compressedLen;
int32 bufferLen;
uint8 *data;
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
completeHeaderLen =
AppendOnlyStorageWrite_CompleteHeaderLen(storageWrite,
AoHeaderKind_SmallContent);
if (contentLen <= storageWrite->maxBufferLen - completeHeaderLen)
{
/*
* This is "small" content.
*/
if (!storageWrite->storageAttributes.compress)
{
data = AppendOnlyStorageWrite_GetBuffer(storageWrite,
AoHeaderKind_SmallContent);
memcpy(data, content, contentLen);
storageWrite->logicalBlockStartOffset =
BufferedAppendNextBufferPosition(&(storageWrite->bufferedAppend));
AppendOnlyStorageWrite_FinishBuffer(storageWrite,
contentLen,
executorBlockKind,
rowCount);
Assert(storageWrite->currentCompleteHeaderLen == 0);
}
else
{
/*
* Since ~_GetBuffer now takes in a specification of the header
* kind, we need to set the header kind so general routines like
* ~_CompressAppend will work correctly when writing the small
* "fragments
*/
storageWrite->getBufferAoHeaderKind = AoHeaderKind_SmallContent;
AppendOnlyStorageWrite_CompressAppend(storageWrite,
content,
contentLen,
executorBlockKind,
rowCount,
&compressedLen,
&bufferLen);
/*
* Just before finishing the AO Storage buffer with our
* non-compressed content, let's verify it.
*/
if (gp_appendonly_verify_write_block)
AppendOnlyStorageWrite_VerifyWriteBlock(storageWrite,
BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend),
bufferLen,
content,
contentLen,
executorBlockKind,
rowCount,
compressedLen);
storageWrite->logicalBlockStartOffset =
BufferedAppendNextBufferPosition(&(storageWrite->bufferedAppend));
/*
* Finish the current buffer by specifying the used length.
*/
BufferedAppendFinishBuffer(&storageWrite->bufferedAppend,
bufferLen,
(storageWrite->currentCompleteHeaderLen +
AOStorage_RoundUp(contentLen, storageWrite->formatVersion) /* non-compressed size */ ),
storageWrite->needsWAL);
/* Declare it finished. */
storageWrite->currentCompleteHeaderLen = 0;
}
}
else
{
int32 largeContentHeaderLen;
uint8 *largeContentHeader;
int32 smallContentHeaderLen;
int32 maxSmallContentLen;
int32 countdownContentLen;
uint8 *contentNext;
int32 smallContentLen;
/*
* Write the "Large" content in fragments.
*/
storageWrite->logicalBlockStartOffset =
BufferedAppendNextBufferPosition(&(storageWrite->bufferedAppend));
/*
* First is a LargeContent header-only block that has the "large"
* content length and "large" row count.
*/
largeContentHeaderLen = AppendOnlyStorageWrite_LargeContentHeaderLen(storageWrite);
largeContentHeader =
BufferedAppendGetBuffer(&storageWrite->bufferedAppend,
largeContentHeaderLen);
AppendOnlyStorageFormat_MakeLargeContentHeader(largeContentHeader,
storageWrite->storageAttributes.checksum,
storageWrite->isFirstRowNumSet,
storageWrite->formatVersion,
storageWrite->firstRowNum,
executorBlockKind,
rowCount,
contentLen);
BufferedAppendFinishBuffer(&storageWrite->bufferedAppend,
largeContentHeaderLen,
largeContentHeaderLen,
storageWrite->needsWAL);
/* Declare it finished. */
storageWrite->currentCompleteHeaderLen = 0;
/*
* Now write the fragments as type Block.
*/
storageWrite->isFirstRowNumSet = false; /* Not written with fragments. */
smallContentHeaderLen =
AppendOnlyStorageWrite_CompleteHeaderLen(storageWrite,
AoHeaderKind_SmallContent);
maxSmallContentLen = storageWrite->maxBufferLen - smallContentHeaderLen;
countdownContentLen = contentLen;
contentNext = content;
while (true)
{
if (countdownContentLen <= maxSmallContentLen)
smallContentLen = countdownContentLen;
else
smallContentLen = maxSmallContentLen;
if (!storageWrite->storageAttributes.compress)
{
data = AppendOnlyStorageWrite_GetBuffer(storageWrite,
AoHeaderKind_SmallContent);
memcpy(data, contentNext, smallContentLen);
AppendOnlyStorageWrite_FinishBuffer(storageWrite,
smallContentLen,
executorBlockKind,
/* rowCount */ 0);
}
else
{
/*
* Since ~_GetBuffer now takes in a specification of the
* header kind, we need to set the header kind so general
* routines like ~_CompressAppend will work correctly when
* writing the small "fragments
*/
storageWrite->getBufferAoHeaderKind = AoHeaderKind_SmallContent;
AppendOnlyStorageWrite_CompressAppend(storageWrite,
contentNext,
smallContentLen,
executorBlockKind,
/* rowCount */ 0,
&compressedLen,
&bufferLen);
/*
* Just before finishing the AO Storage buffer with our
* non-compressed content, let's verify it.
*/
if (gp_appendonly_verify_write_block)
AppendOnlyStorageWrite_VerifyWriteBlock(storageWrite,
BufferedAppendCurrentBufferPosition(&storageWrite->bufferedAppend),
bufferLen,
contentNext,
smallContentLen,
executorBlockKind,
/* rowCount */ 0,
compressedLen);
/*
* Finish the current buffer by specifying the used length.
*/
BufferedAppendFinishBuffer(&storageWrite->bufferedAppend,
bufferLen,
(smallContentHeaderLen +
AOStorage_RoundUp(smallContentLen, storageWrite->formatVersion) /* non-compressed size */ ),
storageWrite->needsWAL);
/* Declare it finished. */
storageWrite->currentCompleteHeaderLen = 0;
}
countdownContentLen -= smallContentLen;
if (countdownContentLen == 0)
break;
contentNext += smallContentLen;
}
}
storageWrite->isFirstRowNumSet = false;
/* Verify we have no buffer allocated. */
Assert(storageWrite->currentCompleteHeaderLen == 0);
}
/*----------------------------------------------------------------
* Optional: Set First Row Number
*----------------------------------------------------------------
*/
/*
* Normally, the first row of an Append-Only Storage Block is implicit. It
* is the last row number of the previous block + 1. However, to support
* BTree indexes that stored TIDs in shared-memory/disk before the
* transaction commits, we may need to not reuse row numbers of aborted
* transactions. So, this routine tells the Append-Only Storage Layer to
* explicitly keep the first row number. This will take up more header
* overhead, so the AppendOnlyStorageWrite_HeaderLen routine should be
* called afterwards to get the new overhead length.
*/
/*
* Set the first row value for the next Append-Only Storage Block to be
* written. Only applies to the next block.
*/
void
AppendOnlyStorageWrite_SetFirstRowNum(AppendOnlyStorageWrite *storageWrite,
int64 firstRowNum)
{
Assert(storageWrite != NULL);
Assert(storageWrite->isActive);
/* UNDONE: Range check firstRowNum */
storageWrite->isFirstRowNumSet = true;
storageWrite->firstRowNum = firstRowNum;
}
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