Tweak MDB_DEBUG output

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index f5db761e9cf4cff32146f67d8ca1084d3ab6a6f9..e991a1720716dd4455a724a37be1971c01ee575b 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -4649,7 +4649,7 @@ mdb_page_search_root(MDB_cursor *mc, MDB_val *key, int modify)
        }
 
        DPRINTF(("found leaf page %"Z"u for key [%s]", mp->mp_pgno,
-           key ? DKEY(key) : NULL));
+           key ? DKEY(key) : "null"));
        mc->mc_flags |= C_INITIALIZED;
        mc->mc_flags &= ~C_EOF;
 
@@ -6245,7 +6245,7 @@ mdb_node_add(MDB_cursor *mc, indx_t indx,
            IS_LEAF(mp) ? "leaf" : "branch",
                IS_SUBP(mp) ? "sub-" : "",
            mp->mp_pgno, indx, data ? data->mv_size : 0,
-               key ? key->mv_size : 0, key ? DKEY(key) : NULL));
+               key ? key->mv_size : 0, key ? DKEY(key) : "null"));
 
        if (IS_LEAF2(mp)) {
                /* Move higher keys up one slot. */
@@ -8323,6 +8323,8 @@ int mdb_reader_check(MDB_env *env, int *dead)
                                        if (!mdb_reader_pid(env, Pidcheck, pid)) {
                                                for (j=i; j<rdrs; j++)
                                                        if (mr[j].mr_pid == pid) {
+                                                               DPRINTF(("clear stale reader pid %u txn %"Z"d",
+                                                                       (unsigned) pid, mr[j].mr_txnid));
                                                                mr[j].mr_pid = 0;
                                                                count++;
                                                        }