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more TDB

This commit is contained in:
Hongze Cheng 2022-03-21 10:18:04 +00:00
parent b3b5298510
commit 1075c230ed
2 changed files with 29 additions and 11 deletions
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37
source/libs/tdb/src/db/tdbBtree.c
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@ -644,19 +644,11 @@ static int tdbBtreeBalanceStep6(SBtreeBalanceHelper *pBlh) {
static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
int ret;
#if 0
SBtreeBalanceHelper blh;
blh.pBt = pBt;
blh.pParent = pParent;
blh.idx = idx;
#endif
int nOlds;
SPage *pOlds[3];
{
// Find 3 child pages at most to do balance
{ // Find 3 child pages at most to do balance
int nCells = TDB_PAGE_TOTAL_CELLS(pParent);
int sIdx;
if (nCells <= 2) {
@ -695,7 +687,32 @@ static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
}
}
// >>>>>>>>>>>>>>>>>>>
int nNews = 0;
int cntNews[5] = {0}; // TODO: maybe 5 is not enough
int szNews[5] = {0};
int maxPageCapacity; // TODO
{ // Get how many new pages are needed and the new distribution
// loop to find number of pages needed
for (int i = 0; i < nOlds; i++) {
SPage *pPage = pOlds[i];
SCell *pCell;
int cellBytes;
for (int cIdx = 0; cIdx < TDB_PAGE_TOTAL_CELLS(pPage); cIdx++) {
pCell = tdbPageGetCell(pPage, cIdx);
cellBytes = TDB_BYTES_CELL_TAKEN(pPage, pCell);
if (szNews[nNews] + cellBytes > maxPageCapacity) {
nNews++;
}
cntNews[nNews]++;
szNews[nNews] = szNews[nNews] + cellBytes;
}
}
// Loop to make the distribution even
}
#if 0
// Step 1: find two sibling pages and get engough info about the old pages

1
source/libs/tdb/src/inc/tdbPage.h
View File

@ -99,6 +99,7 @@ struct SPage {
// APIs
#define TDB_PAGE_TOTAL_CELLS(pPage) ((pPage)->nOverflow + (pPage)->pPageMethods->getCellNum(pPage))
#define TDB_BYTES_CELL_TAKEN(pPage, pCell) ((*(pPage)->xCellSize)(pPage, pCell) + (pPage)->pPageMethods->szOffset)
int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t), void *arg);
int tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg);