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/*-
* Public Domain 2008-2013 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 hot backup worked.
*/
static void
check_copy(void)
{
WT_CONNECTION *conn;
WT_SESSION *session;
int ret;
wts_open(RUNDIR_BACKUP, 0, &conn);
/*
* Open a session and verify the store; some data-sources don't support
* verify.
*
* XXX
* LSM can deadlock if WT_SESSION methods are called at the wrong time,
* don't do that for now.
*/
if (!DATASOURCE("lsm") && !DATASOURCE("memrata")) {
if ((ret = conn->open_session(
conn, NULL, NULL, &session)) != 0)
die(ret, "connection.open_session");
if ((ret = session->verify(session, g.uri, NULL)) != 0)
die(ret, "session.verify: %s", g.uri);
}
if ((ret = conn->close(conn, NULL)) != 0)
die(ret, "connection.close: %s", RUNDIR_BACKUP);
}
/*
* hot_copy --
* Copy a single file into the hot backup directory.
*/
static void
hot_copy(const char *name)
{
char buf[1024];
(void)snprintf(
buf, sizeof(buf), "cp RUNDIR/%s RUNDIR/BACKUP/%s", name, name);
if (system(buf) != 0)
die(errno, "hot backup copy: %s", buf);
}
/*
* hot_backup --
* Periodically do a hot backup and verify it.
*/
void *
hot_backup(void *arg)
{
WT_CONNECTION *conn;
WT_CURSOR *backup_cursor;
WT_SESSION *session;
u_int period;
int ret;
const char *key;
(void)arg;
/* If hot backups aren't configured, we're done. */
if (!g.c_hot_backups)
return (NULL);
/* Hot backups aren't supported for non-standard data sources. */
if (DATASOURCE("kvsbdb") || DATASOURCE("memrata"))
return (NULL);
conn = g.wts_conn;
/* Open a session. */
if ((ret = conn->open_session(
conn, NULL, NULL, &session)) != 0)
die(ret, "connection.open_session");
/*
* Perform a hot backup at somewhere under 10 seconds (so we get at
* least one done), and then at 45 second intervals.
*/
for (period = MMRAND(1, 10);; period = 45) {
/* Sleep for short periods so we don't make the run wait. */
while (period > 0 && !g.threads_finished) {
--period;
sleep(1);
}
if (g.threads_finished)
break;
/* Lock out named checkpoints */
if ((ret = pthread_rwlock_wrlock(&g.backup_lock)) != 0)
die(ret, "pthread_rwlock_wrlock: hot-backup lock");
/* Re-create the backup directory. */
UNUSED_RET(system("cd RUNDIR && rm -rf BACKUP"));
if (mkdir(RUNDIR_BACKUP, 0777) != 0)
die(errno, "mkdir: %s", RUNDIR_BACKUP);
/*
* open_cursor can return EBUSY if a metadata operation is
* currently happening - retry in that case.
*/
while ((ret = session->open_cursor(session,
"backup:", NULL, NULL, &backup_cursor)) == EBUSY)
sleep(1);
if (ret != 0)
die(ret, "session.open_cursor: backup");
while ((ret = backup_cursor->next(backup_cursor)) == 0) {
if ((ret =
backup_cursor->get_key(backup_cursor, &key)) != 0)
die(ret, "cursor.get_key");
hot_copy(key);
}
if ((ret = backup_cursor->close(backup_cursor)) != 0)
die(ret, "cursor.close");
if ((ret = pthread_rwlock_unlock(&g.backup_lock)) != 0)
die(ret, "pthread_rwlock_unlock: hot-backup lock");
check_copy();
}
if ((ret = session->close(session, NULL)) != 0)
die(ret, "session.close");
return (NULL);
}
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