Bug#25513

  "Federared Transactions Failure"
  Bug occurs when the user performs an operation which inserts more than 
  one row into the federated table and the federated table references a 
  remote table stored within a transactional storage engine. When the
  insert operation for any one row in the statement fails due to 
  constraint violation, the federated engine is unable to perform 
  statement rollback and so the remote table contains a partial commit. 
  The user would expect a statement to perform the same so a statement 
  rollback is expected.
  This bug was fixed by implementing  bulk-insert handling into the
  federated storage engine. This will relieve the bug for most common
  situations by enabling the generation of a multi-row insert into the
  remote table and thus permitting the remote table to perform 
  statement rollback when neccessary.
  The multi-row insert is limited to the maximum packet size between 
  servers and should the size overflow, more than one insert statement 
  will be sent and this bug will reappear. Multi-row insert is disabled
  when an "INSERT...ON DUPLICATE KEY UPDATE" is being performed.
  The bulk-insert handling will offer a significant performance boost 
  when inserting a large number of small rows.
This patch builds on Bug29019 and Bug25511

mysql-test/r/federated_innodb.result

+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+stop slave;
+DROP DATABASE IF EXISTS federated;
+CREATE DATABASE federated;
+DROP DATABASE IF EXISTS federated;
+CREATE DATABASE federated;
+create table federated.t1 (a int primary key, b varchar(64))
+engine=myisam;
+create table federated.t1 (a int primary key, b varchar(64))
+engine=federated
+connection='mysql://root@127.0.0.1:SLAVE_PORT/federated/t1';
+insert into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+ERROR 23000: Can't write; duplicate key in table 't1'
+select * from federated.t1;
+a	b
+1	Larry
+2	Curly
+truncate federated.t1;
+alter table federated.t1 engine=innodb;
+insert into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+ERROR 23000: Can't write; duplicate key in table 't1'
+select * from federated.t1;
+a	b
+drop table federated.t1;
+drop table federated.t1;
+DROP TABLE IF EXISTS federated.t1;
+DROP DATABASE IF EXISTS federated;
+DROP TABLE IF EXISTS federated.t1;
+DROP DATABASE IF EXISTS federated;

mysql-test/t/federated_innodb-slave.opt

+--innodb

mysql-test/t/federated_innodb.test

+source include/federated.inc;
+source include/have_innodb.inc;
+
+#
+# Bug#25513 Federated transaction failures
+#
+connection slave;
+create table federated.t1 (a int primary key, b varchar(64))
+  engine=myisam;
+connection master;
+--replace_result $SLAVE_MYPORT SLAVE_PORT
+eval create table federated.t1 (a int primary key, b varchar(64))
+  engine=federated
+  connection='mysql://root@127.0.0.1:$SLAVE_MYPORT/federated/t1';
+
+--error ER_DUP_KEY
+insert into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+select * from federated.t1;
+
+connection slave;
+truncate federated.t1;
+alter table federated.t1 engine=innodb;
+connection master;
+
+--error ER_DUP_KEY
+insert into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+select * from federated.t1;
+
+drop table federated.t1;
+connection slave;
+drop table federated.t1;
+
+
+source include/federated_cleanup.inc;

sql/ha_federated.h

@@ -159,6 +159,7 @@ class ha_federated: public handler
   char remote_error_buf[FEDERATED_QUERY_BUFFER_SIZE];
   bool ignore_duplicates, replace_duplicates;
   bool insert_dup_update;
+  DYNAMIC_STRING bulk_insert;
 
 private:
   /*
@@ -173,6 +174,14 @@ private:
                              bool records_in_range);
   int stash_remote_error();
 
+  bool append_stmt_insert(String *query);
+
+  int read_next(byte *buf, MYSQL_RES *result);
+  int index_read_idx_with_result_set(byte *buf, uint index,
+                                     const byte *key,
+                                     uint key_len,
+                                     ha_rkey_function find_flag,
+                                     MYSQL_RES **result);
 public:
   ha_federated(TABLE *table_arg);
   ~ha_federated()
@@ -258,6 +267,8 @@ public:
   int open(const char *name, int mode, uint test_if_locked);    // required
   int close(void);                                              // required
 
+  void start_bulk_insert(ha_rows rows);
+  int end_bulk_insert();
   int write_row(byte *buf);
   int update_row(const byte *old_data, byte *new_data);
   int delete_row(const byte *buf);
@@ -301,14 +312,7 @@ public:
 
   THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
                              enum thr_lock_type lock_type);     //required
-  virtual bool get_error_message(int error, String *buf);
-
-  int read_next(byte *buf, MYSQL_RES *result);
-  int index_read_idx_with_result_set(byte *buf, uint index,
-                                     const byte *key,
-                                     uint key_len,
-                                     ha_rkey_function find_flag,
-                                     MYSQL_RES **result);
+  bool get_error_message(int error, String *buf);
 };
 
 bool federated_db_init(void);