1 /*-
2 * Public Domain 2014-2018 MongoDB, Inc.
3 * Public Domain 2008-2014 WiredTiger, Inc.
4 *
5 * This is free and unencumbered software released into the public domain.
6 *
7 * Anyone is free to copy, modify, publish, use, compile, sell, or
8 * distribute this software, either in source code form or as a compiled
9 * binary, for any purpose, commercial or non-commercial, and by any
10 * means.
11 *
12 * In jurisdictions that recognize copyright laws, the author or authors
13 * of this software dedicate any and all copyright interest in the
14 * software to the public domain. We make this dedication for the benefit
15 * of the public at large and to the detriment of our heirs and
16 * successors. We intend this dedication to be an overt act of
17 * relinquishment in perpetuity of all present and future rights to this
18 * software under copyright law.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
23 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
27 */
28
29 #include "format.h"
30
31 /*
32 * lrt --
33 * Start a long-running transaction.
34 */
35 WT_THREAD_RET
lrt(void * arg)36 lrt(void *arg)
37 {
38 WT_CONNECTION *conn;
39 WT_CURSOR *cursor;
40 WT_ITEM key, value;
41 WT_SESSION *session;
42 size_t buf_len, buf_size;
43 uint64_t keyno, saved_keyno;
44 uint8_t bitfield;
45 u_int period;
46 int pinned, ret;
47 void *buf;
48
49 (void)(arg); /* Unused parameter */
50
51 saved_keyno = 0; /* [-Werror=maybe-uninitialized] */
52
53 key_gen_init(&key);
54 val_gen_init(&value);
55
56 buf = NULL;
57 buf_len = buf_size = 0;
58
59 /* Open a session and cursor. */
60 conn = g.wts_conn;
61 testutil_check(conn->open_session(conn, NULL, NULL, &session));
62 /*
63 * open_cursor can return EBUSY if concurrent with a metadata
64 * operation, retry in that case.
65 */
66 while ((ret = session->open_cursor(
67 session, g.uri, NULL, NULL, &cursor)) == EBUSY)
68 __wt_yield();
69 testutil_check(ret);
70
71 for (pinned = 0;;) {
72 if (pinned) {
73 /* Re-read the record at the end of the table. */
74 while ((ret = read_row_worker(cursor,
75 saved_keyno, &key, &value, false)) == WT_ROLLBACK)
76 ;
77 if (ret != 0)
78 testutil_die(ret,
79 "read_row_worker %" PRIu64, saved_keyno);
80
81 /* Compare the previous value with the current one. */
82 if (g.type == FIX) {
83 ret = cursor->get_value(cursor, &bitfield);
84 value.data = &bitfield;
85 value.size = 1;
86 } else
87 ret = cursor->get_value(cursor, &value);
88 if (ret != 0)
89 testutil_die(ret,
90 "cursor.get_value: %" PRIu64, saved_keyno);
91
92 if (buf_size != value.size ||
93 memcmp(buf, value.data, value.size) != 0)
94 testutil_die(0, "mismatched start/stop values");
95
96 /* End the transaction. */
97 testutil_check(
98 session->commit_transaction(session, NULL));
99
100 /* Reset the cursor, releasing our pin. */
101 testutil_check(cursor->reset(cursor));
102 pinned = 0;
103 } else {
104 /*
105 * Test named snapshots: create a snapshot, wait to
106 * give the transaction state time to move forward,
107 * then start a transaction with the named snapshot,
108 * drop it, then commit the transaction. This exercises
109 * most of the named snapshot logic under load.
110 */
111 testutil_check(session->snapshot(session, "name=test"));
112 __wt_sleep(1, 0);
113 /*
114 * Keep trying to start a new transaction if it's
115 * timing out - we know there aren't any resources
116 * pinned so it should succeed eventually.
117 */
118 while ((ret = session->begin_transaction(
119 session, "snapshot=test")) == WT_CACHE_FULL)
120 ;
121 testutil_check(ret);
122 testutil_check(session->snapshot(
123 session, "drop=(all)"));
124 testutil_check(session->commit_transaction(
125 session, NULL));
126
127 /*
128 * Begin transaction: without an explicit transaction,
129 * the snapshot is only kept around while a cursor is
130 * positioned. As soon as the cursor loses its position
131 * a new snapshot will be allocated.
132 */
133 while ((ret = session->begin_transaction(
134 session, "snapshot=snapshot")) == WT_CACHE_FULL)
135 ;
136 testutil_check(ret);
137
138 /* Read a record at the end of the table. */
139 do {
140 saved_keyno = mmrand(NULL,
141 (u_int)(g.key_cnt - g.key_cnt / 10),
142 (u_int)g.key_cnt);
143 while ((ret = read_row_worker(cursor,
144 saved_keyno,
145 &key, &value, false)) == WT_ROLLBACK)
146 ;
147 } while (ret == WT_NOTFOUND);
148 if (ret != 0)
149 testutil_die(ret,
150 "read_row_worker %" PRIu64, saved_keyno);
151
152 /* Copy the cursor's value. */
153 if (g.type == FIX) {
154 ret = cursor->get_value(cursor, &bitfield);
155 value.data = &bitfield;
156 value.size = 1;
157 } else
158 ret = cursor->get_value(cursor, &value);
159 if (ret != 0)
160 testutil_die(ret,
161 "cursor.get_value: %" PRIu64, saved_keyno);
162 if (buf_len < value.size)
163 buf = drealloc(buf, buf_len = value.size);
164 memcpy(buf, value.data, buf_size = value.size);
165
166 /*
167 * Move the cursor to an early record in the table,
168 * hopefully allowing the page with the record just
169 * retrieved to be evicted from memory.
170 */
171 do {
172 keyno = mmrand(NULL, 1, (u_int)g.key_cnt / 5);
173 while ((ret = read_row_worker(cursor,
174 keyno, &key, &value, false)) == WT_ROLLBACK)
175 ;
176 } while (ret == WT_NOTFOUND);
177 if (ret != 0)
178 testutil_die(ret,
179 "read_row_worker %" PRIu64, keyno);
180
181 pinned = 1;
182 }
183
184 /* Sleep for some number of seconds. */
185 period = mmrand(NULL, 1, 10);
186
187 /* Sleep for short periods so we don't make the run wait. */
188 while (period > 0 && !g.workers_finished) {
189 --period;
190 __wt_sleep(1, 0);
191 }
192 if (g.workers_finished)
193 break;
194 }
195
196 testutil_check(session->close(session, NULL));
197
198 key_gen_teardown(&key);
199 val_gen_teardown(&value);
200 free(buf);
201
202 return (WT_THREAD_RET_VALUE);
203 }
204