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/*-
* Public Domain 2014-present 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 history store file_max configuration. When the size of the history store 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_hs_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;
/*
* handle_message --
* TODO: Add a comment describing this function.
*/
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 history store 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, NULL};
/*
* hs_workload --
* TODO: Add a comment describing this function.
*/
static void
hs_workload(TEST_OPTS *opts, const char *hs_file_max)
{
WT_CURSOR *cursor;
WT_SESSION *other_session, *session;
int i;
char buf[WT_MEGABYTE], open_config[128];
/*
* 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);
testutil_check(__wt_snprintf(open_config, sizeof(open_config),
"create,cache_size=50MB,history_store=(file_max=%s),statistics=(all)", hs_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 history store 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(opts->conn->close(opts->conn, NULL));
}
/*
* test_hs_workload --
* TODO: Add a comment describing this function.
*/
static void
test_hs_workload(TEST_OPTS *opts, const char *hs_file_max)
{
pid_t pid;
int status;
/*
* 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.
*/
testutil_assert_errno((pid = fork()) >= 0);
if (pid == 0) {
/* Child process from here. */
hs_workload(opts, hs_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. */
testutil_assert_errno(waitpid(pid, &status, 0) != -1);
testutil_assert(status == 0);
}
/*
* main --
* TODO: Add a comment describing this function.
*/
int
main(int argc, char **argv)
{
TEST_OPTS opts;
memset(&opts, 0x0, sizeof(opts));
testutil_check(testutil_parse_opts(argc, argv, &opts));
/*
* The history store is unbounded. We don't expect any failure since we can use as much as
* needed.
*/
expect_panic = false;
test_hs_workload(&opts, "0");
/*
* The history store is limited to 5GB. This is more than enough for this workload so we don't
* expect any failure.
*/
expect_panic = false;
test_hs_workload(&opts, "5GB");
/*
* The history store is limited to 100MB. This is insufficient for this workload so we're
* expecting a failure.
*/
expect_panic = true;
test_hs_workload(&opts, "100MB");
testutil_cleanup(&opts);
return (EXIT_SUCCESS);
}
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