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| author | Eugene Kosov <claprix@yandex.ru> | 2020-05-05 13:24:58 +0300 |
|---|---|---|
| committer | Marko Mäkelä <marko.makela@mariadb.com> | 2020-05-05 21:15:21 +0300 |
| commit | 36b8ac2c0d763a3f96b254cb6e2cbdbc40dde22b (patch) | |
| tree | a418d75d2a5dee280faa56cedd5ee8658d2fdd51 | |
| parent | 937dfb74cb6b2292cfdff47fbb3c52172a2afc4c (diff) | |
| download | mariadb-git-36b8ac2c0d763a3f96b254cb6e2cbdbc40dde22b.tar.gz | |
remove double std::map lookup
| -rw-r--r-- | storage/innobase/trx/trx0purge.cc | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/storage/innobase/trx/trx0purge.cc b/storage/innobase/trx/trx0purge.cc index 35b6b82d2c8..f0b4d6f91b5 100644 --- a/storage/innobase/trx/trx0purge.cc +++ b/storage/innobase/trx/trx0purge.cc @@ -43,6 +43,8 @@ Created 3/26/1996 Heikki Tuuri #include "trx0trx.h" #include <mysql/service_wsrep.h> +#include <unordered_map> + /** Maximum allowable purge history length. <=0 means 'infinite'. */ ulong srv_max_purge_lag = 0; @@ -1136,7 +1138,7 @@ trx_purge_attach_undo_recs(ulint n_purge_threads) i = 0; const ulint batch_size = srv_purge_batch_size; - std::map<table_id_t, purge_node_t*> table_id_map; + std::unordered_map<table_id_t, purge_node_t*> table_id_map; mem_heap_empty(purge_sys.heap); while (UNIV_LIKELY(srv_undo_sources) || !srv_fast_shutdown) { @@ -1170,10 +1172,10 @@ trx_purge_attach_undo_recs(ulint n_purge_threads) table_id_t table_id = trx_undo_rec_get_table_id( purge_rec.undo_rec); - auto it = table_id_map.find(table_id); + purge_node_t *& table_node = table_id_map[table_id]; - if (it != table_id_map.end()) { - node = it->second; + if (table_node) { + node = table_node; } else { thr = UT_LIST_GET_NEXT(thrs, thr); @@ -1183,7 +1185,7 @@ trx_purge_attach_undo_recs(ulint n_purge_threads) } ut_a(thr != NULL); - table_id_map.insert({table_id, node}); + table_node = node; } node->undo_recs.push(purge_rec); |