Bug #21025880 DUPLICATE UK VALUES IN READ-COMMITTED (AGAIN)

PROBLEM

Whenever we insert in unique secondary index we take shared
locks on all possible duplicate record present in the table.
But while during a replace on the unique secondary index ,
we take exclusive and locks on the all duplicate record.
When the records are deleted, they are first delete marked
and later purged by the purge thread. While purging the
record we call the lock_update_delete() which in turn calls
lock_rec_inherit_to_gap() to inherit locks of the deleted
records. In repeatable read mode we inherit all the locks
from the record to the next record  but in the read commited
mode we skip inherting them as gap type locks. We make a
exception here if the lock on the records is  in shared mode
,we assume that it is set during insert for unique secondary
index and needs to be inherited to stop constraint violation.
We didnt handle the case when exclusive locks are set during
replace, we skip inheriting locks of these records and hence
causing constraint violation.

FIX

While inheriting the locks,check whether the transaction is
allowed to do TRX_DUP_REPLACE/TRX_DUP_IGNORE, if true
inherit the locks.

[ Revewied by Jimmy #rb9709]

storage/innobase/lock/lock0lock.c

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -2457,16 +2457,16 @@ lock_rec_inherit_to_gap(
 	/* If srv_locks_unsafe_for_binlog is TRUE or session is using
 	READ COMMITTED isolation level, we do not want locks set
 	by an UPDATE or a DELETE to be inherited as gap type locks. But we
-	DO want S-locks set by a consistency constraint to be inherited also
-	then. */
+	DO want S-locks/X-locks (taken for replace) set by a consistency
+	constraint to be inherited also then. */
 
 	while (lock != NULL) {
 		if (!lock_rec_get_insert_intention(lock)
 		    && !((srv_locks_unsafe_for_binlog
 			  || lock->trx->isolation_level
 			  <= TRX_ISO_READ_COMMITTED)
-			 && lock_get_mode(lock) == LOCK_X)) {
-
+			 && lock_get_mode(lock) ==
+			 (lock->trx->duplicates ? LOCK_S : LOCK_X))) {
 			lock_rec_add_to_queue(LOCK_REC | LOCK_GAP
 					      | lock_get_mode(lock),
 					      heir_block, heir_heap_no,