Merged r4014 from codership/5.5

cmake/wsrep.cmake

@@ -23,7 +23,7 @@ SET(WSREP_PATCH_VERSION "10")
 # MariaDB addition: Revision number of the last revision merged from
 # codership branch visible in @@visible_comment.
 # Branch : codership-mysql/5.5
-SET(WSREP_PATCH_REVNO "4013")  # Should be updated on every merge.
+SET(WSREP_PATCH_REVNO "4014")  # Should be updated on every merge.
 
 # MariaDB: Obtain patch revision number:
 # Update WSREP_PATCH_REVNO if WSREP_REV environment variable is set.

sql/sql_class.h

@@ -594,6 +594,7 @@ typedef struct system_variables
 #ifdef WITH_WSREP
   my_bool wsrep_on;
   my_bool wsrep_causal_reads;
+  uint wsrep_sync_wait;
   ulong wsrep_retry_autocommit;
 #endif
   double long_query_time_double;

sql/sql_parse.cc

@@ -2475,7 +2475,7 @@ mysql_execute_command(THD *thd)
   case SQLCOM_SHOW_STATUS_PROC:
   case SQLCOM_SHOW_STATUS_FUNC:
 #ifdef WITH_WSREP
-    if (WSREP_CLIENT(thd) && wsrep_causal_wait(thd)) goto error;
+    if (WSREP_CLIENT(thd) && wsrep_sync_wait(thd)) goto error;
 #endif /* WITH_WSREP */
     if ((res= check_table_access(thd, SELECT_ACL, all_tables, FALSE,
                                   UINT_MAX, FALSE)))
@@ -2485,7 +2485,7 @@ mysql_execute_command(THD *thd)
   case SQLCOM_SHOW_STATUS:
   {
 #ifdef WITH_WSREP
-    if (WSREP_CLIENT(thd) && wsrep_causal_wait(thd)) goto error;
+    if (WSREP_CLIENT(thd) && wsrep_sync_wait(thd)) goto error;
 #endif /* WITH_WSREP */
     execute_show_status(thd, all_tables);
 #ifdef WITH_WSREP
@@ -2514,7 +2514,7 @@ mysql_execute_command(THD *thd)
   case SQLCOM_SHOW_INDEX_STATS:
   case SQLCOM_SELECT:
 #ifdef WITH_WSREP
-    if (WSREP_CLIENT(thd) && wsrep_causal_wait(thd)) goto error;
+    if (WSREP_CLIENT(thd) && wsrep_sync_wait(thd)) goto error;
   case SQLCOM_SHOW_VARIABLES:
   case SQLCOM_SHOW_CHARSETS:
   case SQLCOM_SHOW_COLLATIONS:
@@ -3079,7 +3079,7 @@ case SQLCOM_PREPARE:
 #else
     {
 #ifdef WITH_WSREP
-      if (WSREP_CLIENT(thd) && wsrep_causal_wait(thd)) goto error;
+      if (WSREP_CLIENT(thd) && wsrep_sync_wait(thd)) goto error;
 #endif /* WITH_WSREP */
 
      /*
@@ -3138,7 +3138,7 @@ case SQLCOM_PREPARE:
   {
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
 #ifdef WITH_WSREP
-    if (WSREP_CLIENT(thd) && wsrep_causal_wait(thd)) goto error;
+    if (WSREP_CLIENT(thd) && wsrep_sync_wait(thd)) goto error;
 #endif /* WITH_WSREP */
 
     if (check_table_access(thd, SELECT_ACL, all_tables,
@@ -3149,6 +3149,10 @@ case SQLCOM_PREPARE:
     break;
   }
   case SQLCOM_UPDATE:
+#ifdef WITH_WSREP
+      if (WSREP_CLIENT(thd) &&
+          wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_UPDATE_DELETE)) goto error;
+#endif /* WITH_WSREP */      
   {
     ha_rows found= 0, updated= 0;
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
@@ -3188,6 +3192,10 @@ case SQLCOM_PREPARE:
     /* if we switched from normal update, rights are checked */
     if (up_result != 2)
     {
+#ifdef WITH_WSREP
+      if (WSREP_CLIENT(thd) &&
+          wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_UPDATE_DELETE)) goto error;
+#endif /* WITH_WSREP */
       if ((res= multi_update_precheck(thd, all_tables)))
         break;
     }
@@ -3257,6 +3265,10 @@ case SQLCOM_PREPARE:
     break;
   }
   case SQLCOM_REPLACE:
+#ifdef WITH_WSREP
+      if (WSREP_CLIENT(thd) &&
+          wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_INSERT_REPLACE)) goto error;
+#endif /* WITH_WSREP */
 #ifndef DBUG_OFF
     if (mysql_bin_log.is_open())
     {
@@ -3292,6 +3304,10 @@ case SQLCOM_PREPARE:
     }
 #endif
   case SQLCOM_INSERT:
+#ifdef WITH_WSREP
+      if (WSREP_CLIENT(thd) &&
+          wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_INSERT_REPLACE)) goto error;
+#endif /* WITH_WSREP */      
   {
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
     if ((res= insert_precheck(thd, all_tables)))
@@ -3333,6 +3349,10 @@ case SQLCOM_PREPARE:
   }
   case SQLCOM_REPLACE_SELECT:
   case SQLCOM_INSERT_SELECT:
+#ifdef WITH_WSREP
+      if (WSREP_CLIENT(thd) &&
+          wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_INSERT_REPLACE)) goto error;
+#endif /* WITH_WSREP */      
   {
     select_result *sel_result;
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
@@ -3429,6 +3449,10 @@ case SQLCOM_PREPARE:
     break;
   }
   case SQLCOM_DELETE:
+#ifdef WITH_WSREP
+    if (WSREP_CLIENT(thd) && 
+        wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_UPDATE_DELETE)) goto error;
+#endif /* WITH_WSREP */
   {
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
     if ((res= delete_precheck(thd, all_tables)))
@@ -3444,6 +3468,10 @@ case SQLCOM_PREPARE:
     break;
   }
   case SQLCOM_DELETE_MULTI:
+#ifdef WITH_WSREP
+    if (WSREP_CLIENT(thd) && 
+        wsrep_sync_wait(thd, WSREP_SYNC_WAIT_BEFORE_UPDATE_DELETE)) goto error;
+#endif /* WITH_WSREP */
   {
     DBUG_ASSERT(first_table == all_tables && first_table != 0);
     TABLE_LIST *aux_tables= thd->lex->auxiliary_table_list.first;

sql/sys_vars.cc

@@ -3865,9 +3865,21 @@ static Sys_var_mybool Sys_wsrep_certify_nonPK(
        CMD_LINE(OPT_ARG), DEFAULT(TRUE));
 
 static Sys_var_mybool Sys_wsrep_causal_reads(
-       "wsrep_causal_reads", "Enable \"strictly synchronous\" semantics for read operations",
+       "wsrep_causal_reads", "(DEPRECATED) setting this variable is equivalent to setting wsrep_sync_wait READ flag",
        SESSION_VAR(wsrep_causal_reads), 
-       CMD_LINE(OPT_ARG), DEFAULT(FALSE));
+       CMD_LINE(OPT_ARG), DEFAULT(FALSE),
+       NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
+       ON_UPDATE(wsrep_causal_reads_update));
+
+static Sys_var_uint Sys_wsrep_sync_wait(
+       "wsrep_sync_wait", "Ensure \"synchronous\" read view before executing an operation of the type specified by bitmask: 1 - READ(includes SELECT, SHOW and BEGIN/START TRANSACTION); 2 - UPDATE and DELETE; 4 - INSERT and REPLACE",
+       SESSION_VAR(wsrep_sync_wait),
+       CMD_LINE(OPT_ARG),
+       VALID_RANGE(WSREP_SYNC_WAIT_NONE, WSREP_SYNC_WAIT_MAX),
+       DEFAULT(WSREP_SYNC_WAIT_NONE),
+       BLOCK_SIZE(1),
+       NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
+       ON_UPDATE(wsrep_sync_wait_update));
 
 static const char *wsrep_OSU_method_names[]= { "TOI", "RSU", NullS };
 static Sys_var_enum Sys_wsrep_OSU_method(

sql/transaction.cc

@@ -161,7 +161,7 @@ bool trans_begin(THD *thd, uint flags)
 
 #ifdef WITH_WSREP
   thd->wsrep_PA_safe= true;
-  if (WSREP_CLIENT(thd) && wsrep_causal_wait(thd))
+  if (WSREP_CLIENT(thd) && wsrep_sync_wait(thd))
     DBUG_RETURN(TRUE);
 #endif /* WITH_WSREP */
 

sql/wsrep_mysqld.cc

@@ -861,13 +861,15 @@ bool wsrep_start_replication()
   return true;
 }
 
-bool
-wsrep_causal_wait (THD* thd)
+bool wsrep_sync_wait (THD* thd, uint mask)
 {
-  if (thd->variables.wsrep_causal_reads && thd->variables.wsrep_on &&
+  if ((thd->variables.wsrep_sync_wait & mask) &&
+      thd->variables.wsrep_on &&
       !thd->in_active_multi_stmt_transaction() &&
       thd->wsrep_conflict_state != REPLAYING)
   {
+    WSREP_DEBUG("wsrep_sync_wait: thd->variables.wsrep_sync_wait = %u, mask = %u",
+                thd->variables.wsrep_sync_wait, mask);
     // This allows autocommit SELECTs and a first SELECT after SET AUTOCOMMIT=0
     // TODO: modify to check if thd has locked any rows.
     wsrep_gtid_t  gtid;
@@ -891,7 +893,7 @@ wsrep_causal_wait (THD* thd)
         err= ER_NOT_SUPPORTED_YET;
         break;
       default:
-        msg= "Causal wait failed.";
+        msg= "Synchronous wait failed.";
         err= ER_LOCK_WAIT_TIMEOUT; // NOTE: the above msg won't be displayed
                                    //       with ER_LOCK_WAIT_TIMEOUT
       }

sql/wsrep_mysqld.h

@@ -101,6 +101,14 @@ extern my_bool     wsrep_slave_FK_checks;
 extern my_bool     wsrep_slave_UK_checks;
 
 enum enum_wsrep_OSU_method { WSREP_OSU_TOI, WSREP_OSU_RSU };
+enum enum_wsrep_sync_wait {
+    WSREP_SYNC_WAIT_NONE = 0x0,
+    // show, select, begin
+    WSREP_SYNC_WAIT_BEFORE_READ = 0x1,
+    WSREP_SYNC_WAIT_BEFORE_UPDATE_DELETE = 0x2,
+    WSREP_SYNC_WAIT_BEFORE_INSERT_REPLACE = 0x4,
+    WSREP_SYNC_WAIT_MAX = 0x7
+};
 
 // MySQL status variables
 extern my_bool     wsrep_connected;
@@ -174,9 +182,10 @@ extern void wsrep_kill_mysql(THD *thd);
 /* new defines */
 extern void wsrep_stop_replication(THD *thd);
 extern bool wsrep_start_replication();
-extern bool wsrep_causal_wait(THD* thd);
+extern bool wsrep_sync_wait (THD* thd, uint mask = WSREP_SYNC_WAIT_BEFORE_READ);
 extern int  wsrep_check_opts (int argc, char* const* argv);
 extern void wsrep_prepend_PATH (const char* path);
+/* some inline functions are defined in wsrep_mysqld_inl.h */
 
 /* Other global variables */
 extern wsrep_seqno_t wsrep_locked_seqno;

sql/wsrep_var.cc

@@ -60,11 +60,29 @@ bool wsrep_on_update (sys_var *self, THD* thd, enum_var_type var_type)
   return false;
 }
 
-void wsrep_causal_reads_update (sys_var *self, THD* thd, enum_var_type var_type)
-{
-  if (var_type == OPT_GLOBAL) {
-    thd->variables.wsrep_causal_reads = global_system_variables.wsrep_causal_reads;
+bool wsrep_causal_reads_update (sys_var *self, THD* thd, enum_var_type var_type)
+{
+  // global setting should not affect session setting.
+  // if (var_type == OPT_GLOBAL) {
+  //   thd->variables.wsrep_causal_reads = global_system_variables.wsrep_causal_reads;
+  // }
+  if (thd->variables.wsrep_causal_reads) {
+    thd->variables.wsrep_sync_wait |= WSREP_SYNC_WAIT_BEFORE_READ;
+  } else {
+    thd->variables.wsrep_sync_wait &= ~WSREP_SYNC_WAIT_BEFORE_READ;
   }
+  return false;
+}
+
+bool wsrep_sync_wait_update (sys_var* self, THD* thd, enum_var_type var_type)
+{
+  // global setting should not affect session setting.
+  // if (var_type == OPT_GLOBAL) {
+  //   thd->variables.wsrep_sync_wait = global_system_variables.wsrep_sync_wait;
+  // }
+  thd->variables.wsrep_causal_reads = thd->variables.wsrep_sync_wait &
+          WSREP_SYNC_WAIT_BEFORE_READ;
+  return false;
 }
 
 static int wsrep_start_position_verify (const char* start_str)

sql/wsrep_var.h

@@ -35,7 +35,8 @@ int wsrep_init_vars();
 #define INIT_ARGS    (const char* opt)
 
 extern bool wsrep_on_update                  UPDATE_ARGS;
-extern void wsrep_causal_reads_update        UPDATE_ARGS;
+extern bool wsrep_causal_reads_update        UPDATE_ARGS;
+extern bool wsrep_sync_wait_update           UPDATE_ARGS;
 extern bool wsrep_start_position_check       CHECK_ARGS;
 extern bool wsrep_start_position_update      UPDATE_ARGS;
 extern void wsrep_start_position_init        INIT_ARGS;