/*
* __wt_cache_config --
* Configure or reconfigure the current cache and shared cache.
*/
int
__wt_cache_config(WT_SESSION_IMPL *session, bool reconfigure, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
bool now_shared, was_shared;
conn = S2C(session);
WT_ASSERT(session, conn->cache != NULL);
WT_RET(__wt_config_gets_none(session, cfg, "shared_cache.name", &cval));
now_shared = cval.len != 0;
was_shared = F_ISSET(conn, WT_CONN_CACHE_POOL);
/* Cleanup if reconfiguring */
if (reconfigure && was_shared && !now_shared)
/* Remove ourselves from the pool if necessary */
WT_RET(__wt_conn_cache_pool_destroy(session));
else if (reconfigure && !was_shared && now_shared)
/*
* Cache size will now be managed by the cache pool - the
* start size always needs to be zero to allow the pool to
* manage how much memory is in-use.
*/
conn->cache_size = 0;
/*
* Always setup the local cache - it's used even if we are
* participating in a shared cache.
*/
WT_RET(__cache_config_local(session, now_shared, cfg));
if (now_shared) {
WT_RET(__wt_cache_pool_config(session, cfg));
WT_ASSERT(session, F_ISSET(conn, WT_CONN_CACHE_POOL));
if (!was_shared)
WT_RET(__wt_conn_cache_pool_open(session));
}
/*
* Resize the thread group if reconfiguring, otherwise the thread group
* will be initialized as part of creating the cache.
*/
if (reconfigure)
WT_RET(__wt_thread_group_resize(
session, &conn->evict_threads,
conn->evict_threads_min, conn->evict_threads_max,
WT_THREAD_CAN_WAIT | WT_THREAD_PANIC_FAIL));
return (0);
}
/*
* __wt_cache_config --
* Configure or reconfigure the current cache and shared cache.
*/
int
__wt_cache_config(WT_SESSION_IMPL *session, int reconfigure, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
int now_shared, was_shared;
conn = S2C(session);
WT_ASSERT(session, conn->cache != NULL);
WT_RET(__wt_config_gets_none(session, cfg, "shared_cache.name", &cval));
now_shared = cval.len != 0;
was_shared = F_ISSET(conn, WT_CONN_CACHE_POOL);
/* Cleanup if reconfiguring */
if (reconfigure && was_shared && !now_shared)
/* Remove ourselves from the pool if necessary */
WT_RET(__wt_conn_cache_pool_destroy(session));
else if (reconfigure && !was_shared && now_shared)
/*
* Cache size will now be managed by the cache pool - the
* start size always needs to be zero to allow the pool to
* manage how much memory is in-use.
*/
conn->cache_size = 0;
/*
* Always setup the local cache - it's used even if we are
* participating in a shared cache.
*/
WT_RET(__cache_config_local(session, now_shared, cfg));
if (now_shared) {
WT_RET(__wt_cache_pool_config(session, cfg));
WT_ASSERT(session, F_ISSET(conn, WT_CONN_CACHE_POOL));
if (!was_shared)
WT_RET(__wt_conn_cache_pool_open(session));
}
return (0);
}
/*读取配置信息，将配置信息设置到当前conn的cache信息*/
int __wt_cache_config(WT_SESSION_IMPL *session, int reconfigure, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
int now_shared, was_shared;
conn = S2C(session);
WT_ASSERT(session, conn->cache != NULL);
WT_RET(__wt_config_gets_none(session, cfg, "shared_cache.name", &cval));
now_shared = cval.len != 0;
was_shared = F_ISSET(conn, WT_CONN_CACHE_POOL);
/* Cleanup if reconfiguring */
if (reconfigure && was_shared && !now_shared)
/* Remove ourselves from the pool if necessary */
WT_RET(__wt_conn_cache_pool_destroy(session)); /*如果原来是cache pool管理connection cache,现在的配置设置成独立的cache管理，那么从cache pool中删除管理关系*/
else if (reconfigure && !was_shared && now_shared)
/*
* Cache size will now be managed by the cache pool - the
* start size always needs to be zero to allow the pool to
* manage how much memory is in-use.
*/
conn->cache_size = 0;
/*配置connection的cache*/
WT_RET(__cache_config_local(session, now_shared, cfg));
if (now_shared) {
WT_RET(__wt_cache_pool_config(session, cfg)); /*对cache pool的配置更新*/
WT_ASSERT(session, F_ISSET(conn, WT_CONN_CACHE_POOL));
if (!was_shared)
WT_RET(__wt_conn_cache_pool_open(session)); /*将connection cache加入到cache pool当中进行管理*/
}
return 0;
}
/*
* __wt_connection_close --
* Close a connection handle.
*/
int
__wt_connection_close(WT_CONNECTION_IMPL *conn)
{
WT_CONNECTION *wt_conn;
WT_DECL_RET;
WT_DLH *dlh;
WT_SESSION_IMPL *s, *session;
WT_TXN_GLOBAL *txn_global;
u_int i;
wt_conn = &conn->iface;
txn_global = &conn->txn_global;
session = conn->default_session;
/*
* We're shutting down. Make sure everything gets freed.
*
* It's possible that the eviction server is in the middle of a long
* operation, with a transaction ID pinned. In that case, we will loop
* here until the transaction ID is released, when the oldest
* transaction ID will catch up with the current ID.
*/
for (;;) {
WT_TRET(__wt_txn_update_oldest(session,
WT_TXN_OLDEST_STRICT | WT_TXN_OLDEST_WAIT));
if (txn_global->oldest_id == txn_global->current)
break;
__wt_yield();
}
/* Clear any pending async ops. */
WT_TRET(__wt_async_flush(session));
/*
* Shut down server threads other than the eviction server, which is
* needed later to close btree handles. Some of these threads access
* btree handles, so take care in ordering shutdown to make sure they
* exit before files are closed.
*/
F_CLR(conn, WT_CONN_SERVER_RUN);
WT_TRET(__wt_async_destroy(session));
WT_TRET(__wt_lsm_manager_destroy(session));
WT_TRET(__wt_sweep_destroy(session));
F_SET(conn, WT_CONN_CLOSING);
WT_TRET(__wt_checkpoint_server_destroy(session));
WT_TRET(__wt_statlog_destroy(session, true));
WT_TRET(__wt_evict_destroy(session));
/* Shut down the lookaside table, after all eviction is complete. */
WT_TRET(__wt_las_destroy(session));
/* Close open data handles. */
WT_TRET(__wt_conn_dhandle_discard(session));
/* Shut down metadata tracking, required before creating tables. */
WT_TRET(__wt_meta_track_destroy(session));
/*
* Now that all data handles are closed, tell logging that a checkpoint
* has completed then shut down the log manager (only after closing
* data handles). The call to destroy the log manager is outside the
* conditional because we allocate the log path so that printlog can
* run without running logging or recovery.
*/
if (FLD_ISSET(conn->log_flags, WT_CONN_LOG_ENABLED) &&
FLD_ISSET(conn->log_flags, WT_CONN_LOG_RECOVER_DONE))
WT_TRET(__wt_txn_checkpoint_log(
session, true, WT_TXN_LOG_CKPT_STOP, NULL));
F_CLR(conn, WT_CONN_LOG_SERVER_RUN);
WT_TRET(__wt_logmgr_destroy(session));
/* Free memory for collators, compressors, data sources. */
WT_TRET(__wt_conn_remove_collator(session));
WT_TRET(__wt_conn_remove_compressor(session));
WT_TRET(__wt_conn_remove_data_source(session));
WT_TRET(__wt_conn_remove_encryptor(session));
WT_TRET(__wt_conn_remove_extractor(session));
/* Disconnect from shared cache - must be before cache destroy. */
WT_TRET(__wt_conn_cache_pool_destroy(session));
/* Discard the cache. */
WT_TRET(__wt_cache_destroy(session));
/* Discard transaction state. */
WT_TRET(__wt_txn_global_destroy(session));
/* Close extensions, first calling any unload entry point. */
while ((dlh = TAILQ_FIRST(&conn->dlhqh)) != NULL) {
TAILQ_REMOVE(&conn->dlhqh, dlh, q);
if (dlh->terminate != NULL)
WT_TRET(dlh->terminate(wt_conn));
WT_TRET(__wt_dlclose(session, dlh));
}
/* Close the lock file, opening up the database to other connections. */
if (conn->lock_fh != NULL)
WT_TRET(__wt_close(session, &conn->lock_fh));
/* Close any file handles left open. */
WT_TRET(__wt_close_connection_close(session));
/*
* Close the internal (default) session, and switch back to the dummy
* session in case of any error messages from the remaining operations
* while destroying the connection handle.
*/
if (session != &conn->dummy_session) {
WT_TRET(session->iface.close(&session->iface, NULL));
session = conn->default_session = &conn->dummy_session;
}
/*
* The session's split stash isn't discarded during normal session close
* because it may persist past the life of the session. Discard it now.
*/
if ((s = conn->sessions) != NULL)
for (i = 0; i < conn->session_size; ++s, ++i)
__wt_split_stash_discard_all(session, s);
/*
* The session's hazard pointer memory isn't discarded during normal
* session close because access to it isn't serialized. Discard it
* now.
*/
if ((s = conn->sessions) != NULL)
for (i = 0; i < conn->session_size; ++s, ++i) {
/*
* If hash arrays were allocated, free them now.
*/
__wt_free(session, s->dhhash);
__wt_free(session, s->tablehash);
__wt_free(session, s->hazard);
}
/* Destroy the handle. */
WT_TRET(__wt_connection_destroy(conn));
return (ret);
}
/*
* __wt_connection_close --
* Close a connection handle.
*/
int
__wt_connection_close(WT_CONNECTION_IMPL *conn)
{
WT_CONNECTION *wt_conn;
WT_DECL_RET;
WT_DLH *dlh;
WT_SESSION_IMPL *s, *session;
u_int i;
wt_conn = &conn->iface;
session = conn->default_session;
/* Shut down transactions (wait for in-flight operations to complete. */
WT_TRET(__wt_txn_global_shutdown(session));
/* Shut down the subsystems, ensuring workers see the state change. */
F_SET(conn, WT_CONN_CLOSING);
WT_FULL_BARRIER();
/*
* Clear any pending async operations and shut down the async worker
* threads and system before closing LSM.
*/
WT_TRET(__wt_async_flush(session));
WT_TRET(__wt_async_destroy(session));
/*
* Shut down server threads other than the eviction server, which is
* needed later to close btree handles. Some of these threads access
* btree handles, so take care in ordering shutdown to make sure they
* exit before files are closed.
*/
WT_TRET(__wt_lsm_manager_destroy(session));
/*
* Once the async and LSM threads exit, we shouldn't be opening any
* more files.
*/
F_SET(conn, WT_CONN_CLOSING_NO_MORE_OPENS);
WT_FULL_BARRIER();
WT_TRET(__wt_checkpoint_server_destroy(session));
WT_TRET(__wt_statlog_destroy(session, true));
WT_TRET(__wt_sweep_destroy(session));
/* The eviction server is shut down last. */
WT_TRET(__wt_evict_destroy(session));
/* Shut down the lookaside table, after all eviction is complete. */
WT_TRET(__wt_las_destroy(session));
/* Close open data handles. */
WT_TRET(__wt_conn_dhandle_discard(session));
/* Shut down metadata tracking. */
WT_TRET(__wt_meta_track_destroy(session));
/*
* Now that all data handles are closed, tell logging that a checkpoint
* has completed then shut down the log manager (only after closing
* data handles). The call to destroy the log manager is outside the
* conditional because we allocate the log path so that printlog can
* run without running logging or recovery.
*/
if (FLD_ISSET(conn->log_flags, WT_CONN_LOG_ENABLED) &&
FLD_ISSET(conn->log_flags, WT_CONN_LOG_RECOVER_DONE))
WT_TRET(__wt_txn_checkpoint_log(
session, true, WT_TXN_LOG_CKPT_STOP, NULL));
WT_TRET(__wt_logmgr_destroy(session));
/* Free memory for collators, compressors, data sources. */
WT_TRET(__wt_conn_remove_collator(session));
WT_TRET(__wt_conn_remove_compressor(session));
WT_TRET(__wt_conn_remove_data_source(session));
WT_TRET(__wt_conn_remove_encryptor(session));
WT_TRET(__wt_conn_remove_extractor(session));
/* Disconnect from shared cache - must be before cache destroy. */
WT_TRET(__wt_conn_cache_pool_destroy(session));
/* Discard the cache. */
WT_TRET(__wt_cache_destroy(session));
/* Discard transaction state. */
__wt_txn_global_destroy(session);
/* Close the lock file, opening up the database to other connections. */
if (conn->lock_fh != NULL)
WT_TRET(__wt_close(session, &conn->lock_fh));
/* Close any file handles left open. */
WT_TRET(__wt_close_connection_close(session));
/*
* Close the internal (default) session, and switch back to the dummy
* session in case of any error messages from the remaining operations
* while destroying the connection handle.
*/
if (session != &conn->dummy_session) {
WT_TRET(session->iface.close(&session->iface, NULL));
session = conn->default_session = &conn->dummy_session;
}
/*
* The session split stash, hazard information and handle arrays aren't
* discarded during normal session close, they persist past the life of
* the session. Discard them now.
*/
if (!F_ISSET(conn, WT_CONN_LEAK_MEMORY))
if ((s = conn->sessions) != NULL)
for (i = 0; i < conn->session_size; ++s, ++i) {
__wt_free(session, s->dhhash);
__wt_stash_discard_all(session, s);
__wt_free(session, s->hazard);
}
/* Destroy the file-system configuration. */
if (conn->file_system != NULL && conn->file_system->terminate != NULL)
WT_TRET(conn->file_system->terminate(
conn->file_system, (WT_SESSION *)session));
/* Close extensions, first calling any unload entry point. */
while ((dlh = TAILQ_FIRST(&conn->dlhqh)) != NULL) {
TAILQ_REMOVE(&conn->dlhqh, dlh, q);
if (dlh->terminate != NULL)
WT_TRET(dlh->terminate(wt_conn));
WT_TRET(__wt_dlclose(session, dlh));
}
/* Destroy the handle. */
__wt_connection_destroy(conn);
return (ret);
}
