From 7d249c97adf34cf9d6861a47e37c1c7202dd62a8 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Tue, 27 Apr 2021 23:16:28 +0300
Subject: [PATCH] mdbx: double dirtyroom reserve for page stack.

Related to https://github.com/erthink/libmdbx/issues/186

Change-Id: I211fc9c849c9a45254e699d713475898fd20a58e
---
 src/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/core.c b/src/core.c
index 7016bc00..95493026 100644
--- a/src/core.c
+++ b/src/core.c
@@ -5326,7 +5326,10 @@ static int mdbx_cursor_spill(MDBX_cursor *mc, const MDBX_val *key,
     if (mc->mc_dbi > MAIN_DBI)
       need += txn->mt_dbs[MAIN_DBI].md_depth + 3;
   }
-  /* 4) Factor the key+data which to be put in */
+  /* 4) Double the page chain estimation
+   * for extensively splitting, rebalance and merging */
+  need += need;
+  /* 5) Factor the key+data which to be put in */
   need += bytes2pgno(txn->mt_env, node_size(key, data)) + 1;
   return mdbx_txn_spill(txn, mc, need);
 }