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ITS#8221 don't merge branch pages needlessly

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This commit is contained in:
Howard Chu 2015-09-26 16:50:28 +01:00
parent ddb7478e06
commit 4b01cb3727
1 changed files with 10 additions and 5 deletions
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15
libraries/liblmdb/mdb.c
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@ -7685,17 +7685,23 @@ mdb_rebalance(MDB_cursor *mc)
{
MDB_node *node;
int rc;
unsigned int ptop, minkeys;
unsigned int ptop, minkeys, thresh;
MDB_cursor mn;
indx_t oldki;
minkeys = 1 + (IS_BRANCH(mc->mc_pg[mc->mc_top]));
if (IS_BRANCH(mc->mc_pg[mc->mc_top])) {
minkeys = 1;
thresh = 1;
} else {
minkeys = 2;
thresh = FILL_THRESHOLD;
}
DPRINTF(("rebalancing %s page %"Z"u (has %u keys, %.1f%% full)",
IS_LEAF(mc->mc_pg[mc->mc_top]) ? "leaf" : "branch",
mdb_dbg_pgno(mc->mc_pg[mc->mc_top]), NUMKEYS(mc->mc_pg[mc->mc_top]),
(float)PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) / 10));
if (PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) >= FILL_THRESHOLD &&
if (PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) >= thresh &&
NUMKEYS(mc->mc_pg[mc->mc_top]) >= minkeys) {
DPRINTF(("no need to rebalance page %"Z"u, above fill threshold",
mdb_dbg_pgno(mc->mc_pg[mc->mc_top])));
@ -7829,8 +7835,7 @@ mdb_rebalance(MDB_cursor *mc)
* move one key from it. Otherwise we should try to merge them.
* (A branch page must never have less than 2 keys.)
*/
minkeys = 1 + (IS_BRANCH(mn.mc_pg[mn.mc_top]));
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= FILL_THRESHOLD && NUMKEYS(mn.mc_pg[mn.mc_top]) > minkeys) {
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= thresh && NUMKEYS(mn.mc_pg[mn.mc_top]) > minkeys) {
rc = mdb_node_move(&mn, mc);
if (mc->mc_ki[ptop]) {
oldki++;