Make snapshot the default txn mode

Signed-off-by: mdouglas47 <[email protected]>

Author: morgando

db/comdb2.c

@@ -448,8 +448,8 @@ int gbl_goslow = 0; /* set to disable "gofast" */
 
 int gbl_selectv_rangechk = 0; /* disable selectv range check by default */
 
-int gbl_sql_tranlevel_preserved = SQL_TDEF_SOCK;
-int gbl_sql_tranlevel_default = SQL_TDEF_SOCK;
+int gbl_sql_tranlevel_preserved = SQL_TDEF_SNAPISOL;
+int gbl_sql_tranlevel_default = SQL_TDEF_SNAPISOL;
 int gbl_exit_alarm_sec = 300;
 int gbl_test_blkseq_replay_code = 0;
 int gbl_dump_blkseq = 0;
@@ -460,8 +460,8 @@ int gbl_disable_overflow_page_trace = 1;
 int gbl_simulate_rowlock_deadlock_interval = 0;
 int gbl_enable_berkdb_retry_deadlock_bias = 0;
 int gbl_enable_cache_internal_nodes = 1;
-int gbl_use_modsnap_for_snapshot = 0;
-int gbl_modsnap_asof = 0;
+int gbl_use_modsnap_for_snapshot = 1;
+int gbl_modsnap_asof = 1;
 int gbl_rep_process_txn_time = 0;
 int gbl_utxnid_log = 1;
 int gbl_test_commit_lsn_map = 0;
@@ -532,7 +532,7 @@ int gbl_rowlocks = 0;
 int gbl_disable_tagged_api = 1;
 int gbl_disable_tagged_api_writes = 1;
 int gbl_serializable = 0; // Just for bookkeeping
-int gbl_snapisol = 0;
+int gbl_snapisol = 1;
 int gbl_new_snapisol = 0;
 int gbl_new_snapisol_asof = 0;
 int gbl_new_snapisol_logging = 0;

plugins/newsql/newsql.c

@@ -2410,7 +2410,7 @@ newsql_loop_result newsql_loop(struct sqlclntstate *clnt, CDB2SQLQUERY *sql_quer
         clnt->ctrl_sqlengine = SQLENG_NORMAL_PROCESS;
     }
     if (clnt->dbtran.mode < TRANLEVEL_SOSQL) {
-        clnt->dbtran.mode = TRANLEVEL_SOSQL;
+        clnt->dbtran.mode = TRANLEVEL_MODSNAP;
     }
     clnt->osql.sent_column_data = 0;