1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*-
* Public Domain 2014-2019 MongoDB, Inc.
* Public Domain 2008-2014 WiredTiger, Inc.
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "test_util.h"
#include <signal.h>
#include <sys/wait.h>
/*
* JIRA ticket reference: WT-4803 Test case description: This test is checking the functionality of
* the lookaside file_max configuration. When the size of the lookaside file exceeds this value, we
* expect to panic. Failure mode: If we receive a panic in the test cases we weren't expecting to
* and vice versa.
*/
#define NUM_KEYS 2000
/*
* This is a global flag that should be set before running test_las_workload. It lets the child
* process know whether it should be expecting a panic or not so that it can adjust its exit code as
* needed.
*/
static bool expect_panic;
static int
handle_message(WT_EVENT_HANDLER *handler, WT_SESSION *session, int error, const char *message)
{
WT_UNUSED(handler);
WT_UNUSED(session);
(void)fprintf(stderr, "%s: %s\n", message, session->strerror(session, error));
if (error == WT_PANIC && strstr(message, "exceeds maximum size") != NULL) {
fprintf(
stderr, "Got cache overflow error (expect_panic=%s)\n", expect_panic ? "true" : "false");
/*
* If we're expecting a panic, exit with zero to indicate to the
* parent that this test was successful.
*
* If not, don't intercept. We'll naturally exit with non-zero
* if we're terminating due to panic.
*/
if (expect_panic)
exit(EXIT_SUCCESS);
}
return (0);
}
static WT_EVENT_HANDLER event_handler = {handle_message, NULL, NULL, NULL};
static void
las_workload(TEST_OPTS *opts, const char *las_file_max)
{
WT_CURSOR *cursor;
WT_SESSION *other_session, *session;
int i;
char buf[WT_MEGABYTE], open_config[128];
testutil_check(__wt_snprintf(open_config, sizeof(open_config),
"create,cache_size=50MB,cache_overflow=(file_max=%s)", las_file_max));
testutil_check(wiredtiger_open(opts->home, &event_handler, open_config, &opts->conn));
testutil_check(opts->conn->open_session(opts->conn, NULL, NULL, &session));
testutil_check(session->create(session, opts->uri, "key_format=i,value_format=S"));
testutil_check(session->open_cursor(session, opts->uri, NULL, NULL, &cursor));
memset(buf, 0xA, WT_MEGABYTE);
buf[WT_MEGABYTE - 1] = '\0';
/* Populate the table. */
for (i = 0; i < NUM_KEYS; ++i) {
cursor->set_key(cursor, i);
cursor->set_value(cursor, buf);
testutil_check(cursor->insert(cursor));
}
/*
* Open a snapshot isolation transaction in another session. This forces
* the cache to retain all previous values. Then update all keys with a
* new value in the original session while keeping that snapshot
* transaction open. With the large value buffer, small cache and lots
* of keys, this will force a lot of lookaside usage.
*
* When the file_max setting is small, the maximum size should easily be
* reached and we should panic. When the maximum size is large or not
* set, then we should succeed.
*/
testutil_check(opts->conn->open_session(opts->conn, NULL, NULL, &other_session));
testutil_check(other_session->begin_transaction(other_session, "isolation=snapshot"));
memset(buf, 0xB, WT_MEGABYTE);
buf[WT_MEGABYTE - 1] = '\0';
for (i = 0; i < NUM_KEYS; ++i) {
cursor->set_key(cursor, i);
cursor->set_value(cursor, buf);
testutil_check(cursor->update(cursor));
}
/*
* Cleanup. We do not get here when the file_max size is small because we will have already hit
* the maximum and exited. This code only executes on the successful path.
*/
testutil_check(other_session->rollback_transaction(other_session, NULL));
testutil_check(other_session->close(other_session, NULL));
testutil_check(cursor->close(cursor));
testutil_check(session->close(session, NULL));
}
static int
test_las_workload(TEST_OPTS *opts, const char *las_file_max)
{
pid_t pid;
int status;
/*
* We're going to run this workload for different configurations of file_max. So clean out the
* work directory each time.
*/
testutil_make_work_dir(opts->home);
/*
* Since it's possible that the workload will panic and abort, we will
* fork the process and execute the workload in the child process.
*
* This way, we can safely check the exit code of the child process and
* confirm that it is what we expected.
*/
pid = fork();
if (pid < 0)
/* Failed fork. */
testutil_die(errno, "fork");
else if (pid == 0) {
/* Child process from here. */
las_workload(opts, las_file_max);
/*
* If we're expecting a panic during the workload, we shouldn't get to this point. Exit with
* non-zero to indicate to parent that we should fail this test.
*/
fprintf(stderr, "Successfully completed workload (expect_panic=%s)\n",
expect_panic ? "true" : "false");
if (expect_panic)
exit(EXIT_FAILURE);
else
exit(EXIT_SUCCESS);
}
/* Parent process from here. */
if (waitpid(pid, &status, 0) == -1)
testutil_die(errno, "waitpid");
return (status);
}
int
main(int argc, char **argv)
{
TEST_OPTS opts;
memset(&opts, 0x0, sizeof(opts));
testutil_check(testutil_parse_opts(argc, argv, &opts));
/*
* The lookaside is unbounded. We don't expect any failure since we can use as much as needed.
*/
expect_panic = false;
testutil_check(test_las_workload(&opts, "0"));
/*
* The lookaside is limited to 5GB. This is more than enough for this workload so we don't
* expect any failure.
*/
expect_panic = false;
testutil_check(test_las_workload(&opts, "5GB"));
/*
* The lookaside is limited to 100MB. This is insufficient for this workload so we're expecting
* a failure.
*/
expect_panic = true;
testutil_check(test_las_workload(&opts, "100MB"));
testutil_cleanup(&opts);
return (0);
}
|
