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/*-
* Public Domain 2014-2018 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 "format.h"
/*
* check_copy --
* Confirm the backup worked.
*/
static void
check_copy(void)
{
WT_CONNECTION *conn;
WT_DECL_RET;
WT_SESSION *session;
wts_open(g.home_backup, false, &conn);
testutil_checkfmt(
conn->open_session(conn, NULL, NULL, &session),
"%s", g.home_backup);
/*
* Verify can return EBUSY if the handle isn't available. Don't yield
* and retry, in the case of LSM, the handle may not be available for
* a long time.
*/
ret = session->verify(session, g.uri, NULL);
testutil_assertfmt(ret == 0 || ret == EBUSY,
"WT_SESSION.verify: %s: %s", g.home_backup, g.uri);
testutil_checkfmt(conn->close(conn, NULL), "%s", g.home_backup);
}
/*
* copy_file --
* Copy a single file into the backup directories.
*/
static void
copy_file(WT_SESSION *session, const char *name)
{
size_t len;
char *first, *second;
len = strlen("BACKUP") + strlen(name) + 10;
first = dmalloc(len);
testutil_check(__wt_snprintf(first, len, "BACKUP/%s", name));
testutil_check(__wt_copy_and_sync(session, name, first));
/*
* Save another copy of the original file to make debugging recovery
* errors easier.
*/
len = strlen("BACKUP_COPY") + strlen(name) + 10;
second = dmalloc(len);
testutil_check(__wt_snprintf(second, len, "BACKUP_COPY/%s", name));
testutil_check(__wt_copy_and_sync(session, first, second));
free(first);
free(second);
}
/*
* backup --
* Periodically do a backup and verify it.
*/
WT_THREAD_RET
backup(void *arg)
{
WT_CONNECTION *conn;
WT_CURSOR *backup_cursor;
WT_DECL_RET;
WT_SESSION *session;
u_int incremental, period;
const char *config, *key;
bool full;
(void)(arg);
conn = g.wts_conn;
/* Backups aren't supported for non-standard data sources. */
if (DATASOURCE("helium") || DATASOURCE("kvsbdb"))
return (WT_THREAD_RET_VALUE);
/* Open a session. */
testutil_check(conn->open_session(conn, NULL, NULL, &session));
/*
* Perform a full backup at somewhere under 10 seconds (that way there's
* at least one), then at larger intervals, optionally do incremental
* backups between full backups.
*/
incremental = 0;
for (period = mmrand(NULL, 1, 10);; period = mmrand(NULL, 20, 45)) {
/* Sleep for short periods so we don't make the run wait. */
while (period > 0 && !g.workers_finished) {
--period;
__wt_sleep(1, 0);
}
/*
* We can't drop named checkpoints while there's a backup in
* progress, serialize backups with named checkpoints. Wait
* for the checkpoint to complete, otherwise backups might be
* starved out.
*/
testutil_check(pthread_rwlock_wrlock(&g.backup_lock));
if (g.workers_finished) {
testutil_check(pthread_rwlock_unlock(&g.backup_lock));
break;
}
if (incremental) {
config = "target=(\"log:\")";
full = false;
} else {
/* Re-create the backup directory. */
testutil_checkfmt(
system(g.home_backup_init),
"%s", "backup directory creation failed");
config = NULL;
full = true;
}
/*
* open_cursor can return EBUSY if concurrent with a metadata
* operation, retry in that case.
*/
while ((ret = session->open_cursor(
session, "backup:", NULL, config, &backup_cursor)) == EBUSY)
__wt_yield();
if (ret != 0)
testutil_die(ret, "session.open_cursor: backup");
while ((ret = backup_cursor->next(backup_cursor)) == 0) {
testutil_check(
backup_cursor->get_key(backup_cursor, &key));
copy_file(session, key);
}
if (ret != WT_NOTFOUND)
testutil_die(ret, "backup-cursor");
/* After an incremental backup, truncate the log files. */
if (incremental)
testutil_check(session->truncate(
session, "log:", backup_cursor, NULL, NULL));
testutil_check(backup_cursor->close(backup_cursor));
testutil_check(pthread_rwlock_unlock(&g.backup_lock));
/*
* If automatic log archival isn't configured, optionally do
* incremental backups after each full backup. If we're not
* doing any more incrementals, verify the backup (we can't
* verify intermediate states, once we perform recovery on the
* backup database, we can't do any more incremental backups).
*/
if (full)
incremental =
g.c_logging_archive ? 1 : mmrand(NULL, 1, 5);
if (--incremental == 0)
check_copy();
}
if (incremental != 0)
check_copy();
testutil_check(session->close(session, NULL));
return (WT_THREAD_RET_VALUE);
}
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