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ITS#7536 fix mdb_rebalance

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A page must always have at least 2 keys (unless it's a root page)
This commit is contained in:
Howard Chu 2013-03-06 12:30:37 -08:00 committed by Howard Chu
parent 6dab37f2ac
commit d74330128a
1 changed files with 4 additions and 3 deletions
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7
libraries/liblmdb/mdb.c
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@ -6368,12 +6368,13 @@ mdb_rebalance(MDB_cursor *mc)
DPRINTF("found neighbor page %zu (%u keys, %.1f%% full)",
mn.mc_pg[mn.mc_top]->mp_pgno, NUMKEYS(mn.mc_pg[mn.mc_top]), (float)PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) / 10);
/* If the neighbor page is above threshold and has at least two
* keys, move one key from it.
/* If the neighbor page is above threshold and has at least three
* keys, move one key from it. (A page must never have fewer than
* 2 keys.)
*
* Otherwise we should try to merge them.
*/
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= FILL_THRESHOLD && NUMKEYS(mn.mc_pg[mn.mc_top]) >= 2)
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= FILL_THRESHOLD && NUMKEYS(mn.mc_pg[mn.mc_top]) > 2)
return mdb_node_move(&mn, mc);
else {
if (mc->mc_ki[ptop] == 0)