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/*-
* Public Domain 2014-2016 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 "wtperf.h"
static inline uint64_t
decode_key(char *key_buf)
{
return (strtoull(key_buf, NULL, 10));
}
int
setup_truncate(CONFIG *cfg, CONFIG_THREAD *thread, WT_SESSION *session) {
TRUNCATE_CONFIG *trunc_cfg;
TRUNCATE_QUEUE_ENTRY *truncate_item;
WORKLOAD *workload;
WT_CURSOR *cursor;
char *key, *truncate_key;
int ret;
uint64_t end_point, final_stone_gap, i, start_point;
end_point = final_stone_gap = start_point = 0;
trunc_cfg = &thread->trunc_cfg;
workload = thread->workload;
/* We are limited to only one table when running truncate. */
if ((ret = session->open_cursor(
session, cfg->uris[0], NULL, NULL, &cursor)) != 0)
goto err;
/*
* If we find the workload getting behind we multiply the number of
* records to be truncated.
*/
trunc_cfg->catchup_multiplier = 1;
/* How many entries between each stone. */
trunc_cfg->stone_gap =
(workload->truncate_count * workload->truncate_pct) / 100;
/* How many stones we need. */
trunc_cfg->needed_stones =
workload->truncate_count / trunc_cfg->stone_gap;
final_stone_gap = trunc_cfg->stone_gap;
/* Reset this value for use again. */
trunc_cfg->stone_gap = 0;
/*
* Here we check if there is data in the collection. If there is
* data available, then we need to setup some initial truncation
* stones.
*/
if ((ret = cursor->next(cursor)) != 0 ||
(ret = cursor->get_key(cursor, &key)) != 0) {
lprintf(cfg, ret, 0, "truncate setup start: failed");
goto err;
}
start_point = decode_key(key);
if ((cursor->reset(cursor)) != 0 || (ret = cursor->prev(cursor)) != 0 ||
(ret = cursor->get_key(cursor, &key)) != 0) {
lprintf(cfg, ret, 0, "truncate setup end: failed");
goto err;
}
end_point = decode_key(key);
/* Assign stones if there are enough documents. */
if (start_point + trunc_cfg->needed_stones > end_point)
trunc_cfg->stone_gap = 0;
else
trunc_cfg->stone_gap =
(end_point - start_point) / trunc_cfg->needed_stones;
/* If we have enough data allocate some stones. */
if (trunc_cfg->stone_gap != 0) {
trunc_cfg->expected_total = (end_point - start_point);
for (i = 1; i <= trunc_cfg->needed_stones; i++) {
truncate_key = calloc(cfg->key_sz, 1);
if (truncate_key == NULL) {
ret = enomem(cfg);
goto err;
}
truncate_item = calloc(sizeof(TRUNCATE_QUEUE_ENTRY), 1);
if (truncate_item == NULL) {
free(truncate_key);
ret = enomem(cfg);
goto err;
}
generate_key(
cfg, truncate_key, trunc_cfg->stone_gap * i);
truncate_item->key = truncate_key;
truncate_item->diff =
(trunc_cfg->stone_gap * i) - trunc_cfg->last_key;
TAILQ_INSERT_TAIL( &cfg->stone_head, truncate_item, q);
trunc_cfg->last_key = trunc_cfg->stone_gap * i;
trunc_cfg->num_stones++;
}
}
trunc_cfg->stone_gap = final_stone_gap;
err: if ((ret = cursor->close(cursor)) != 0) {
lprintf(cfg, ret, 0, "truncate setup: cursor close failed");
}
return (ret);
}
int
run_truncate(CONFIG *cfg, CONFIG_THREAD *thread,
WT_CURSOR *cursor, WT_SESSION *session, int *truncatedp) {
TRUNCATE_CONFIG *trunc_cfg;
TRUNCATE_QUEUE_ENTRY *truncate_item;
char *truncate_key;
int ret, t_ret;
uint64_t used_stone_gap;
ret = 0;
trunc_cfg = &thread->trunc_cfg;
*truncatedp = 0;
/* Update the total inserts */
trunc_cfg->total_inserts = sum_insert_ops(cfg);
trunc_cfg->expected_total +=
(trunc_cfg->total_inserts - trunc_cfg->last_total_inserts);
trunc_cfg->last_total_inserts = trunc_cfg->total_inserts;
/* We are done if there isn't enough data to trigger a new milestone. */
if (trunc_cfg->expected_total <= thread->workload->truncate_count)
return (0);
/*
* If we are falling behind and using more than one stone per lap we
* should widen the stone gap for this lap to try and catch up quicker.
*/
if (trunc_cfg->expected_total >
thread->workload->truncate_count + trunc_cfg->stone_gap) {
/*
* Increase the multiplier until we create stones that are
* almost large enough to truncate the whole expected table size
* in one operation.
*/
trunc_cfg->catchup_multiplier =
WT_MIN(trunc_cfg->catchup_multiplier + 1,
trunc_cfg->needed_stones - 1);
} else {
/* Back off if we start seeing an improvement */
trunc_cfg->catchup_multiplier =
WT_MAX(trunc_cfg->catchup_multiplier - 1, 1);
}
used_stone_gap = trunc_cfg->stone_gap * trunc_cfg->catchup_multiplier;
while (trunc_cfg->num_stones < trunc_cfg->needed_stones) {
trunc_cfg->last_key += used_stone_gap;
truncate_key = calloc(cfg->key_sz, 1);
if (truncate_key == NULL) {
lprintf(cfg, ENOMEM, 0,
"truncate: couldn't allocate key array");
return (ENOMEM);
}
truncate_item = calloc(sizeof(TRUNCATE_QUEUE_ENTRY), 1);
if (truncate_item == NULL) {
free(truncate_key);
lprintf(cfg, ENOMEM, 0,
"truncate: couldn't allocate item");
return (ENOMEM);
}
generate_key(cfg, truncate_key, trunc_cfg->last_key);
truncate_item->key = truncate_key;
truncate_item->diff = used_stone_gap;
TAILQ_INSERT_TAIL(&cfg->stone_head, truncate_item, q);
trunc_cfg->num_stones++;
}
/* We are done if there isn't enough data to trigger a truncate. */
if (trunc_cfg->num_stones == 0 ||
trunc_cfg->expected_total <= thread->workload->truncate_count)
return (0);
truncate_item = TAILQ_FIRST(&cfg->stone_head);
trunc_cfg->num_stones--;
TAILQ_REMOVE(&cfg->stone_head, truncate_item, q);
cursor->set_key(cursor,truncate_item->key);
if ((ret = cursor->search(cursor)) != 0) {
lprintf(cfg, ret, 0, "Truncate search: failed");
goto err;
}
if ((ret = session->truncate(session, NULL, NULL, cursor, NULL)) != 0) {
lprintf(cfg, ret, 0, "Truncate: failed");
goto err;
}
*truncatedp = 1;
trunc_cfg->expected_total -= truncate_item->diff;
err: free(truncate_item->key);
free(truncate_item);
t_ret = cursor->reset(cursor);
if (t_ret != 0)
lprintf(cfg, t_ret, 0, "Cursor reset failed");
if (ret == 0 && t_ret != 0)
ret = t_ret;
return (ret);
}
void
cleanup_truncate_config(CONFIG *cfg) {
TRUNCATE_QUEUE_ENTRY *truncate_item;
while (!TAILQ_EMPTY(&cfg->stone_head)) {
truncate_item = TAILQ_FIRST(&cfg->stone_head);
TAILQ_REMOVE(&cfg->stone_head, truncate_item, q);
free(truncate_item->key);
free(truncate_item);
}
}
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