1 /*
2 Copyright (c) 2011, 2021, Oracle and/or its affiliates.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License, version 2.0,
6 as published by the Free Software Foundation.
7
8 This program is also distributed with certain software (including
9 but not limited to OpenSSL) that is licensed under separate terms,
10 as designated in a particular file or component or in included license
11 documentation. The authors of MySQL hereby grant you an additional
12 permission to link the program and your derivative works with the
13 separately licensed software that they have included with MySQL.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License, version 2.0, for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include "ndb_thd_ndb.h"
26 #include "mysql/plugin.h" // thd_get_thread_id
27
28 /*
29 Default value for max number of transactions createable against NDB from
30 the handler. Should really be 2 but there is a transaction to much allocated
31 when lock table is used, and one extra to used for global schema lock.
32 */
33 static const int MAX_TRANSACTIONS= 4;
34
35
36 Thd_ndb*
seize(THD * thd)37 Thd_ndb::seize(THD* thd)
38 {
39 DBUG_ENTER("seize_thd_ndb");
40
41 Thd_ndb* thd_ndb= new Thd_ndb(thd);
42 if (thd_ndb == NULL)
43 DBUG_RETURN(NULL);
44
45 if (thd_ndb->ndb->init(MAX_TRANSACTIONS) != 0)
46 {
47 DBUG_PRINT("error", ("Ndb::init failed, error: %d message: %s",
48 thd_ndb->ndb->getNdbError().code,
49 thd_ndb->ndb->getNdbError().message));
50
51 delete thd_ndb;
52 thd_ndb= NULL;
53 }
54 else
55 {
56 thd_ndb->ndb->setCustomData64(thd_get_thread_id(thd));
57 }
58 DBUG_RETURN(thd_ndb);
59 }
60
61
62 void
release(Thd_ndb * thd_ndb)63 Thd_ndb::release(Thd_ndb* thd_ndb)
64 {
65 DBUG_ENTER("release_thd_ndb");
66 delete thd_ndb;
67 DBUG_VOID_RETURN;
68 }
69
70
71 bool
recycle_ndb(void)72 Thd_ndb::recycle_ndb(void)
73 {
74 DBUG_ENTER("recycle_ndb");
75 DBUG_PRINT("enter", ("ndb: 0x%lx", (long)ndb));
76
77 assert(global_schema_lock_trans == NULL);
78 assert(trans == NULL);
79
80 delete ndb;
81 if ((ndb= new Ndb(connection, "")) == NULL)
82 {
83 DBUG_PRINT("error",("failed to allocate Ndb object"));
84 DBUG_RETURN(false);
85 }
86
87 if (ndb->init(MAX_TRANSACTIONS) != 0)
88 {
89 delete ndb;
90 ndb= NULL;
91 DBUG_PRINT("error", ("Ndb::init failed, %d message: %s",
92 ndb->getNdbError().code,
93 ndb->getNdbError().message));
94 DBUG_RETURN(false);
95 }
96 else
97 {
98 ndb->setCustomData64(thd_get_thread_id(m_thd));
99 }
100
101 /* Reset last commit epoch for this 'session'. */
102 m_last_commit_epoch_session = 0;
103
104 DBUG_RETURN(true);
105 }
106
107
108 bool
valid_ndb(void) const109 Thd_ndb::valid_ndb(void) const
110 {
111 // The ndb object should be valid as long as a
112 // global schema lock transaction is ongoing
113 if (global_schema_lock_trans)
114 return true;
115
116 // The ndb object should be valid as long as a
117 // transaction is ongoing
118 if (trans)
119 return true;
120
121 if (unlikely(m_connect_count != connection->get_connect_count()))
122 return false;
123
124 return true;
125 }
126
127
128 void
init_open_tables()129 Thd_ndb::init_open_tables()
130 {
131 count= 0;
132 m_error= FALSE;
133 my_hash_reset(&open_tables);
134 }
135
136
137 /*
138 Used for every additional row operation, to update the guesstimate
139 of pending bytes to send, and to check if it is now time to flush a batch.
140 */
141
142 bool
add_row_check_if_batch_full(uint size)143 Thd_ndb::add_row_check_if_batch_full(uint size)
144 {
145 if (m_unsent_bytes == 0)
146 free_root(&m_batch_mem_root, MY_MARK_BLOCKS_FREE);
147
148 uint unsent= m_unsent_bytes;
149 unsent+= size;
150 m_unsent_bytes= unsent;
151 return unsent >= m_batch_size;
152 }
153