mirror of https://github.com/citusdata/citus.git
Start Maintenance Daemon for Main DB at the server start. (#7254)
DESCRIPTION: This change starts a maintenance deamon at the time of
server start if there is a designated main database.
This is the code flow:
1. User designates a main database:
`ALTER SYSTEM SET citus.main_db = "myadmindb";`
2. When postmaster starts, in _PG_Init, citus calls
`InitializeMaintenanceDaemonForMainDb`
This function registers a background worker to run
`CitusMaintenanceDaemonMain `with `databaseOid = 0 `
3. `CitusMaintenanceDaemonMain ` takes some special actions when
databaseOid is 0:
- Gets the citus.main_db value.
- Connects to the citus.main_db
- Now the `MyDatabaseId `is available, creates a hash entry for it.
- Then follows the same control flow as for a regular db,
gokhangulbiz/gha-checkout-version-bump^2
Emel Şimşek
GitHub
parent
d0b093c975
commit
ee8f4bb7e8
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@ -481,6 +481,7 @@ _PG_init(void)
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#endif
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InitializeMaintenanceDaemon();
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InitializeMaintenanceDaemonForMainDb();
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/* initialize coordinated transaction management */
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InitializeTransactionManagement();
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@ -1820,6 +1821,16 @@ RegisterCitusConfigVariables(void)
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GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_UNIT_MS,
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NULL, NULL, NULL);
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DefineCustomStringVariable(
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"citus.main_db",
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gettext_noop("Which database is designated as the main_db"),
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NULL,
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&MainDb,
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"",
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PGC_POSTMASTER,
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GUC_STANDARD,
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NULL, NULL, NULL);
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DefineCustomIntVariable(
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"citus.max_adaptive_executor_pool_size",
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gettext_noop("Sets the maximum number of connections per worker node used by "
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@ -99,6 +99,7 @@ int Recover2PCInterval = 60000;
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int DeferShardDeleteInterval = 15000;
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int BackgroundTaskQueueCheckInterval = 5000;
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int MaxBackgroundTaskExecutors = 4;
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char *MainDb = "";
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/* config variables for metadata sync timeout */
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int MetadataSyncInterval = 60000;
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@ -112,7 +113,7 @@ static MaintenanceDaemonControlData *MaintenanceDaemonControl = NULL;
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* activated.
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*/
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static HTAB *MaintenanceDaemonDBHash;
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static ErrorContextCallback errorCallback = { 0 };
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static volatile sig_atomic_t got_SIGHUP = false;
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static volatile sig_atomic_t got_SIGTERM = false;
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@ -125,6 +126,8 @@ static void MaintenanceDaemonShmemExit(int code, Datum arg);
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static void MaintenanceDaemonErrorContext(void *arg);
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static bool MetadataSyncTriggeredCheckAndReset(MaintenanceDaemonDBData *dbData);
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static void WarnMaintenanceDaemonNotStarted(void);
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static MaintenanceDaemonDBData * GetMaintenanceDaemonDBHashEntry(Oid databaseId,
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bool *found);
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/*
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* InitializeMaintenanceDaemon, called at server start, is responsible for
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@ -139,6 +142,82 @@ InitializeMaintenanceDaemon(void)
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}
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/*
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* GetMaintenanceDaemonDBHashEntry searches the MaintenanceDaemonDBHash for the
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* databaseId. It returns the entry if found or creates a new entry and initializes
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* the value with zeroes.
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*/
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MaintenanceDaemonDBData *
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GetMaintenanceDaemonDBHashEntry(Oid databaseId, bool *found)
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{
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MaintenanceDaemonDBData *dbData = (MaintenanceDaemonDBData *) hash_search(
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MaintenanceDaemonDBHash,
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&MyDatabaseId,
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HASH_ENTER_NULL,
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found);
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if (!dbData)
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{
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elog(LOG,
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"cannot create or find the maintenance deamon hash entry for database %u",
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databaseId);
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return NULL;
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}
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if (!*found)
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{
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/* ensure the values in MaintenanceDaemonDBData are zero */
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memset(((char *) dbData) + sizeof(Oid), 0,
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sizeof(MaintenanceDaemonDBData) - sizeof(Oid));
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}
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return dbData;
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}
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/*
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* InitializeMaintenanceDaemonForMainDb is called in _PG_Init
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* at which stage we are not in a transaction or have databaseOid
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*/
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void
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InitializeMaintenanceDaemonForMainDb(void)
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{
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if (strcmp(MainDb, "") == 0)
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{
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elog(LOG, "There is no designated Main database.");
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return;
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}
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BackgroundWorker worker;
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memset(&worker, 0, sizeof(worker));
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strcpy_s(worker.bgw_name, sizeof(worker.bgw_name),
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"Citus Maintenance Daemon for Main DB");
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/* request ability to connect to target database */
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worker.bgw_flags = BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION;
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/*
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* No point in getting started before able to run query, but we do
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* want to get started on Hot-Standby.
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*/
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worker.bgw_start_time = BgWorkerStart_ConsistentState;
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/* Restart after a bit after errors, but don't bog the system. */
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worker.bgw_restart_time = 5;
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strcpy_s(worker.bgw_library_name,
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sizeof(worker.bgw_library_name), "citus");
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strcpy_s(worker.bgw_function_name, sizeof(worker.bgw_library_name),
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"CitusMaintenanceDaemonMain");
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worker.bgw_main_arg = (Datum) 0;
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RegisterBackgroundWorker(&worker);
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}
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/*
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* InitializeMaintenanceDaemonBackend, called at backend start and
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* configuration changes, is responsible for starting a per-database
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@ -148,31 +227,20 @@ void
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InitializeMaintenanceDaemonBackend(void)
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{
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Oid extensionOwner = CitusExtensionOwner();
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bool found;
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bool found = false;
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LWLockAcquire(&MaintenanceDaemonControl->lock, LW_EXCLUSIVE);
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MaintenanceDaemonDBData *dbData = (MaintenanceDaemonDBData *) hash_search(
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MaintenanceDaemonDBHash,
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&MyDatabaseId,
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HASH_ENTER_NULL,
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&found);
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MaintenanceDaemonDBData *dbData = GetMaintenanceDaemonDBHashEntry(MyDatabaseId,
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&found);
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if (dbData == NULL)
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{
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WarnMaintenanceDaemonNotStarted();
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LWLockRelease(&MaintenanceDaemonControl->lock);
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return;
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}
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if (!found)
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{
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/* ensure the values in MaintenanceDaemonDBData are zero */
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memset(((char *) dbData) + sizeof(Oid), 0,
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sizeof(MaintenanceDaemonDBData) - sizeof(Oid));
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}
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if (IsMaintenanceDaemon)
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{
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/*
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@ -271,66 +339,97 @@ WarnMaintenanceDaemonNotStarted(void)
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/*
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* CitusMaintenanceDaemonMain is the maintenance daemon's main routine, it'll
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* be started by the background worker infrastructure. If it errors out,
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* it'll be restarted after a few seconds.
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* ConnectToDatabase connects to the database for the given databaseOid.
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* if databaseOid is 0, connects to MainDb and then creates a hash entry.
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* If a hash entry cannot be created for MainDb it exits the process requesting a restart.
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* However for regular databases, it exits without requesting a restart since another
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* subsequent backend is expected to start the Maintenance Daemon.
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* If the found hash entry has a valid workerPid, it exits
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* without requesting a restart since there is already a daemon running.
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*/
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void
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CitusMaintenanceDaemonMain(Datum main_arg)
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static MaintenanceDaemonDBData *
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ConnectToDatabase(Oid databaseOid)
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{
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Oid databaseOid = DatumGetObjectId(main_arg);
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TimestampTz nextStatsCollectionTime USED_WITH_LIBCURL_ONLY =
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TimestampTzPlusMilliseconds(GetCurrentTimestamp(), 60 * 1000);
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bool retryStatsCollection USED_WITH_LIBCURL_ONLY = false;
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TimestampTz lastRecoveryTime = 0;
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TimestampTz lastShardCleanTime = 0;
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TimestampTz lastStatStatementsPurgeTime = 0;
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TimestampTz nextMetadataSyncTime = 0;
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MaintenanceDaemonDBData *myDbData = NULL;
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/* state kept for the background tasks queue monitor */
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TimestampTz lastBackgroundTaskQueueCheck = GetCurrentTimestamp();
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BackgroundWorkerHandle *backgroundTasksQueueBgwHandle = NULL;
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bool backgroundTasksQueueWarnedForLock = false;
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/*
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* We do metadata sync in a separate background worker. We need its
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* handle to be able to check its status.
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*/
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BackgroundWorkerHandle *metadataSyncBgwHandle = NULL;
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bool isMainDb = false;
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/*
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* Look up this worker's configuration.
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*/
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LWLockAcquire(&MaintenanceDaemonControl->lock, LW_EXCLUSIVE);
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MaintenanceDaemonDBData *myDbData = (MaintenanceDaemonDBData *)
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hash_search(MaintenanceDaemonDBHash, &databaseOid,
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HASH_FIND, NULL);
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if (!myDbData)
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{
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/*
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* When the database crashes, background workers are restarted, but
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* the state in shared memory is lost. In that case, we exit and
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* wait for a session to call InitializeMaintenanceDaemonBackend
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* to properly add it to the hash.
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*/
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proc_exit(0);
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if (databaseOid == 0)
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{
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char *databaseName = MainDb;
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/*
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* Since we cannot query databaseOid without initializing Postgres
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* first, connect to the database by name.
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*/
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BackgroundWorkerInitializeConnection(databaseName, NULL, 0);
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/*
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* Now we have a valid MyDatabaseId.
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* Insert the hash entry for the database to the Maintenance Deamon Hash.
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*/
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bool found = false;
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myDbData = GetMaintenanceDaemonDBHashEntry(MyDatabaseId, &found);
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if (!myDbData)
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{
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/*
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* If an entry cannot be created,
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* return code of 1 requests worker restart
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* Since BackgroundWorker for the MainDb is only registered
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* once during server startup, we need to retry.
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*/
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proc_exit(1);
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}
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if (found && myDbData->workerPid != 0)
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{
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/* Another maintenance daemon is running.*/
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proc_exit(0);
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}
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databaseOid = MyDatabaseId;
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myDbData->userOid = GetSessionUserId();
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isMainDb = true;
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}
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else
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{
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myDbData = (MaintenanceDaemonDBData *)
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hash_search(MaintenanceDaemonDBHash, &databaseOid,
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HASH_FIND, NULL);
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if (!myDbData)
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{
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/*
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* When the database crashes, background workers are restarted, but
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* the state in shared memory is lost. In that case, we exit and
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* wait for a session to call InitializeMaintenanceDaemonBackend
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* to properly add it to the hash.
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*/
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proc_exit(0);
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}
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if (myDbData->workerPid != 0)
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{
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/*
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* Another maintenance daemon is running. This usually happens because
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* postgres restarts the daemon after an non-zero exit, and
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* InitializeMaintenanceDaemonBackend started one before postgres did.
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* In that case, the first one stays and the last one exits.
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*/
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proc_exit(0);
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}
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}
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if (myDbData->workerPid != 0)
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{
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/*
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* Another maintenance daemon is running. This usually happens because
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* postgres restarts the daemon after an non-zero exit, and
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* InitializeMaintenanceDaemonBackend started one before postgres did.
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* In that case, the first one stays and the last one exits.
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*/
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proc_exit(0);
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}
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before_shmem_exit(MaintenanceDaemonShmemExit, main_arg);
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before_shmem_exit(MaintenanceDaemonShmemExit, ObjectIdGetDatum(databaseOid));
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/*
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* Signal that I am the maintenance daemon now.
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@ -356,25 +455,55 @@ CitusMaintenanceDaemonMain(Datum main_arg)
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LWLockRelease(&MaintenanceDaemonControl->lock);
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/*
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* Setup error context so log messages can be properly attributed. Some of
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* them otherwise sound like they might be from a normal user connection.
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* Do so before setting up signals etc, so we never exit without the
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* context setup.
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*/
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ErrorContextCallback errorCallback = { 0 };
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memset(&errorCallback, 0, sizeof(errorCallback));
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errorCallback.callback = MaintenanceDaemonErrorContext;
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errorCallback.arg = (void *) myDbData;
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errorCallback.previous = error_context_stack;
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error_context_stack = &errorCallback;
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elog(LOG, "starting maintenance daemon on database %u user %u",
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databaseOid, myDbData->userOid);
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/* connect to database, after that we can actually access catalogs */
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BackgroundWorkerInitializeConnectionByOid(databaseOid, myDbData->userOid, 0);
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if (!isMainDb)
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{
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/* connect to database, after that we can actually access catalogs */
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BackgroundWorkerInitializeConnectionByOid(databaseOid, myDbData->userOid, 0);
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}
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return myDbData;
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}
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/*
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* CitusMaintenanceDaemonMain is the maintenance daemon's main routine, it'll
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* be started by the background worker infrastructure. If it errors out,
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* it'll be restarted after a few seconds.
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*/
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void
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CitusMaintenanceDaemonMain(Datum main_arg)
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{
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Oid databaseOid = DatumGetObjectId(main_arg);
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TimestampTz nextStatsCollectionTime USED_WITH_LIBCURL_ONLY =
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TimestampTzPlusMilliseconds(GetCurrentTimestamp(), 60 * 1000);
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bool retryStatsCollection USED_WITH_LIBCURL_ONLY = false;
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TimestampTz lastRecoveryTime = 0;
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TimestampTz lastShardCleanTime = 0;
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TimestampTz lastStatStatementsPurgeTime = 0;
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TimestampTz nextMetadataSyncTime = 0;
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/* state kept for the background tasks queue monitor */
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TimestampTz lastBackgroundTaskQueueCheck = GetCurrentTimestamp();
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BackgroundWorkerHandle *backgroundTasksQueueBgwHandle = NULL;
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bool backgroundTasksQueueWarnedForLock = false;
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/*
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* We do metadata sync in a separate background worker. We need its
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* handle to be able to check its status.
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*/
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BackgroundWorkerHandle *metadataSyncBgwHandle = NULL;
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MaintenanceDaemonDBData *myDbData = ConnectToDatabase(databaseOid);
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/* make worker recognizable in pg_stat_activity */
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pgstat_report_appname("Citus Maintenance Daemon");
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@ -383,7 +512,7 @@ CitusMaintenanceDaemonMain(Datum main_arg)
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* Terminate orphaned metadata sync daemons spawned from previously terminated
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* or crashed maintenanced instances.
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*/
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SignalMetadataSyncDaemon(databaseOid, SIGTERM);
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SignalMetadataSyncDaemon(MyDatabaseId, SIGTERM);
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/* enter main loop */
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while (!got_SIGTERM)
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@ -945,7 +1074,7 @@ MaintenanceDaemonShmemExit(int code, Datum arg)
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}
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/* MaintenanceDaemonSigTermHandler calls proc_exit(0) */
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/* MaintenanceDaemonSigTermHandler sets the got_SIGTERM flag.*/
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static void
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MaintenanceDaemonSigTermHandler(SIGNAL_ARGS)
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{
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@ -20,6 +20,7 @@
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/* config variable for */
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extern double DistributedDeadlockDetectionTimeoutFactor;
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extern char *MainDb;
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extern void StopMaintenanceDaemon(Oid databaseId);
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extern void TriggerNodeMetadataSync(Oid databaseId);
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@ -27,6 +28,7 @@ extern void InitializeMaintenanceDaemon(void);
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extern size_t MaintenanceDaemonShmemSize(void);
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extern void MaintenanceDaemonShmemInit(void);
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extern void InitializeMaintenanceDaemonBackend(void);
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extern void InitializeMaintenanceDaemonForMainDb(void);
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extern bool LockCitusExtension(void);
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extern PGDLLEXPORT void CitusMaintenanceDaemonMain(Datum main_arg);
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@ -453,6 +453,9 @@ def cleanup_test_leftovers(nodes):
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for node in nodes:
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node.cleanup_schemas()
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for node in nodes:
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node.cleanup_databases()
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for node in nodes:
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node.cleanup_users()
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@ -753,6 +756,7 @@ class Postgres(QueryRunner):
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self.subscriptions = set()
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self.publications = set()
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self.replication_slots = set()
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self.databases = set()
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self.schemas = set()
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self.users = set()
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@ -993,6 +997,10 @@ class Postgres(QueryRunner):
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args = sql.SQL("")
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self.sql(sql.SQL("CREATE USER {} {}").format(sql.Identifier(name), args))
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def create_database(self, name):
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self.databases.add(name)
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self.sql(sql.SQL("CREATE DATABASE {}").format(sql.Identifier(name)))
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def create_schema(self, name):
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self.schemas.add(name)
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self.sql(sql.SQL("CREATE SCHEMA {}").format(sql.Identifier(name)))
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@ -1020,6 +1028,12 @@ class Postgres(QueryRunner):
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for user in self.users:
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self.sql(sql.SQL("DROP USER IF EXISTS {}").format(sql.Identifier(user)))
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def cleanup_databases(self):
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for database in self.databases:
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self.sql(
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sql.SQL("DROP DATABASE IF EXISTS {}").format(sql.Identifier(database))
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)
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def cleanup_schemas(self):
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for schema in self.schemas:
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self.sql(
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@ -0,0 +1,74 @@
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# This test checks that once citus.main_db is set and the
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# server is restarted. A Citus Maintenance Daemon for the main_db
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# is launched. This should happen even if there is no query run
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# in main_db yet.
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import time
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|
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def wait_until_maintenance_deamons_start(deamoncount, cluster):
|
||||
i = 0
|
||||
n = 0
|
||||
|
||||
while i < 10:
|
||||
i += 1
|
||||
n = cluster.coordinator.sql_value(
|
||||
"SELECT count(*) FROM pg_stat_activity WHERE application_name = 'Citus Maintenance Daemon';"
|
||||
)
|
||||
|
||||
if n == deamoncount:
|
||||
break
|
||||
|
||||
time.sleep(0.1)
|
||||
|
||||
assert n == deamoncount
|
||||
|
||||
|
||||
def test_set_maindb(cluster_factory):
|
||||
cluster = cluster_factory(0)
|
||||
|
||||
# Test that once citus.main_db is set to a database name
|
||||
# there are two maintenance deamons running upon restart.
|
||||
# One maintenance deamon for the database of the current connection
|
||||
# and one for the citus.main_db.
|
||||
cluster.coordinator.create_database("mymaindb")
|
||||
cluster.coordinator.configure("citus.main_db='mymaindb'")
|
||||
cluster.coordinator.restart()
|
||||
|
||||
assert cluster.coordinator.sql_value("SHOW citus.main_db;") == "mymaindb"
|
||||
|
||||
wait_until_maintenance_deamons_start(2, cluster)
|
||||
|
||||
assert (
|
||||
cluster.coordinator.sql_value(
|
||||
"SELECT count(*) FROM pg_stat_activity WHERE application_name = 'Citus Maintenance Daemon' AND datname='mymaindb';"
|
||||
)
|
||||
== 1
|
||||
)
|
||||
|
||||
# Test that once citus.main_db is set to empty string
|
||||
# there is only one maintenance deamon for the database
|
||||
# of the current connection.
|
||||
cluster.coordinator.configure("citus.main_db=''")
|
||||
cluster.coordinator.restart()
|
||||
assert cluster.coordinator.sql_value("SHOW citus.main_db;") == ""
|
||||
|
||||
wait_until_maintenance_deamons_start(1, cluster)
|
||||
|
||||
# Test that after citus.main_db is dropped. The maintenance
|
||||
# deamon for this database is terminated.
|
||||
cluster.coordinator.configure("citus.main_db='mymaindb'")
|
||||
cluster.coordinator.restart()
|
||||
assert cluster.coordinator.sql_value("SHOW citus.main_db;") == "mymaindb"
|
||||
|
||||
wait_until_maintenance_deamons_start(2, cluster)
|
||||
|
||||
cluster.coordinator.sql("DROP DATABASE mymaindb;")
|
||||
|
||||
wait_until_maintenance_deamons_start(1, cluster)
|
||||
|
||||
assert (
|
||||
cluster.coordinator.sql_value(
|
||||
"SELECT count(*) FROM pg_stat_activity WHERE application_name = 'Citus Maintenance Daemon' AND datname='mymaindb';"
|
||||
)
|
||||
== 0
|
||||
)
|
||||
Loading…
Reference in New Issue