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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 "src/common/api_const.h"
#include "src/common/random_generator.h"
#include "src/component/workload_tracking.h"
#include "src/main/test.h"
using namespace test_harness;
/* Defines what data is written to the tracking table for use in custom validation. */
class tracking_table_cache_resize : public workload_tracking {
public:
tracking_table_cache_resize(
configuration *config, const bool use_compression, timestamp_manager &tsm)
: workload_tracking(config, use_compression, tsm)
{
}
void
set_tracking_cursor(const uint64_t txn_id, const tracking_operation &operation,
const uint64_t &, const std::string &, const std::string &value, wt_timestamp_t ts,
scoped_cursor &op_track_cursor) override final
{
op_track_cursor->set_key(op_track_cursor.get(), ts, txn_id);
op_track_cursor->set_value(op_track_cursor.get(), operation, value.c_str());
}
};
/*
* This test continuously writes transactions larger than 1MB but less than 500MB into the database,
* while switching the connection cache size between 1MB and 500MB. When transactions are larger
* than the cache size they are rejected, so only transactions made when cache size is 500MB should
* be allowed.
*/
class cache_resize : public test {
public:
cache_resize(const test_args &args) : test(args)
{
init_tracking(new tracking_table_cache_resize(_config->get_subconfig(WORKLOAD_TRACKING),
_config->get_bool(COMPRESSION_ENABLED), *_timestamp_manager));
}
void
custom_operation(thread_context *tc) override final
{
WT_CONNECTION *conn = connection_manager::instance().get_connection();
WT_CONNECTION_IMPL *conn_impl = (WT_CONNECTION_IMPL *)conn;
bool increase_cache = false;
const std::string small_cache_size = "cache_size=1MB";
const std::string big_cache_size = "cache_size=500MB";
while (tc->running()) {
tc->sleep();
/* Get the current cache size. */
uint64_t prev_cache_size = conn_impl->cache_size;
/* Reconfigure with the new cache size. */
testutil_check(conn->reconfigure(
conn, increase_cache ? big_cache_size.c_str() : small_cache_size.c_str()));
/* Get the new cache size. */
uint64_t new_cache_size = conn_impl->cache_size;
logger::log_msg(LOG_TRACE,
"The cache size was updated from " + std::to_string(prev_cache_size) + " to " +
std::to_string(new_cache_size));
/*
* The collection id and the key are dummy fields which are required by the
* save_operation API but not needed for this test.
*/
const uint64_t collection_id = 0;
const std::string key;
const std::string value = std::to_string(new_cache_size);
/* Retrieve the current transaction id. */
uint64_t txn_id = ((WT_SESSION_IMPL *)tc->session.get())->txn->id;
/* Save the change of cache size in the tracking table. */
tc->transaction.begin();
int ret = tc->tracking->save_operation(txn_id, tracking_operation::CUSTOM,
collection_id, key, value, tc->tsm->get_next_ts(), tc->op_track_cursor);
if (ret == 0)
testutil_assert(tc->transaction.commit());
else {
/* Due to the cache pressure, it is possible to fail when saving the operation. */
testutil_assert(ret == WT_ROLLBACK);
logger::log_msg(LOG_WARN,
"The cache size reconfiguration could not be saved in the tracking table, ret: " +
std::to_string(ret));
tc->transaction.rollback();
}
increase_cache = !increase_cache;
}
}
void
insert_operation(thread_context *tc) override final
{
const uint64_t collection_count = tc->db.get_collection_count();
testutil_assert(collection_count > 0);
collection &coll = tc->db.get_collection(collection_count - 1);
scoped_cursor cursor = tc->session.open_scoped_cursor(coll.name);
while (tc->running()) {
tc->sleep();
/* Insert the current cache size value using a random key. */
const std::string key =
random_generator::instance().generate_pseudo_random_string(tc->key_size);
const uint64_t cache_size =
((WT_CONNECTION_IMPL *)connection_manager::instance().get_connection())->cache_size;
/* Take into account the value size given in the test configuration file. */
const std::string value = std::to_string(cache_size);
tc->transaction.try_begin();
if (!tc->insert(cursor, coll.id, key, value)) {
tc->transaction.rollback();
} else if (tc->transaction.can_commit()) {
/*
* The transaction can fit in the current cache size and is ready to be committed.
* This means the tracking table will contain a new record to represent this
* transaction which will be used during the validation stage.
*/
testutil_assert(tc->transaction.commit());
}
}
/* Make sure the last transaction is rolled back now the work is finished. */
if (tc->transaction.active())
tc->transaction.rollback();
}
void
validate(const std::string &operation_table_name, const std::string &,
const std::vector<uint64_t> &) override final
{
bool first_record = false;
int ret;
uint64_t cache_size, num_records = 0, prev_txn_id;
const uint64_t cache_size_500mb = 500000000;
/* FIXME-WT-9339. */
(void)cache_size;
(void)cache_size_500mb;
/* Open a cursor on the tracking table to read it. */
scoped_session session = connection_manager::instance().create_session();
scoped_cursor cursor = session.open_scoped_cursor(operation_table_name);
/*
* Parse the tracking table. Each operation is tracked and each transaction is made of
* multiple operations, hence we expect multiple records for each transaction. We only need
* to verify that the cache size was big enough when the transaction was committed, which
* means at the last operation.
*/
while ((ret = cursor->next(cursor.get())) == 0) {
uint64_t tracked_ts, tracked_txn_id;
int tracked_op_type;
const char *tracked_cache_size;
testutil_check(cursor->get_key(cursor.get(), &tracked_ts, &tracked_txn_id));
testutil_check(cursor->get_value(cursor.get(), &tracked_op_type, &tracked_cache_size));
logger::log_msg(LOG_TRACE,
"Timestamp: " + std::to_string(tracked_ts) +
", transaction id: " + std::to_string(tracked_txn_id) +
", cache size: " + std::to_string(std::stoull(tracked_cache_size)));
tracking_operation op_type = static_cast<tracking_operation>(tracked_op_type);
/* There are only two types of operation tracked. */
testutil_assert(
op_type == tracking_operation::CUSTOM || op_type == tracking_operation::INSERT);
/*
* There is nothing to do if we are reading a record that indicates a cache size change.
*/
if (op_type == tracking_operation::CUSTOM)
continue;
if (first_record) {
first_record = false;
} else if (prev_txn_id != tracked_txn_id) {
/*
* We have moved to a new transaction, make sure the cache was big enough when the
* previous transaction was committed.
*
* FIXME-WT-9339 - Somehow we have some transactions that go through while the cache
* is very low. Enable the check when this is no longer the case.
*
* testutil_assert(cache_size > cache_size_500mb);
*/
}
prev_txn_id = tracked_txn_id;
/* Save the last cache size seen by the transaction. */
cache_size = std::stoull(tracked_cache_size);
++num_records;
}
/* All records have been parsed, the last one still needs the be checked. */
testutil_assert(ret == WT_NOTFOUND);
testutil_assert(num_records > 0);
/*
* FIXME-WT-9339 - Somehow we have some transactions that go through while the cache is very
* low. Enable the check when this is no longer the case.
*
* testutil_assert(cache_size > cache_size_500mb);
*/
}
};
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