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improved and now optional Galera cluster health check
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e2feea8e71
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@ -170,6 +170,13 @@ class egw_db
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*/
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static $tablealiases = array();
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/**
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* Callback to check if selected node is healty / should be used
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*
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* @var callback throwing egw_exception_db_connection, if connected node should NOT be used
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*/
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static $health_check;
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/**
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* db allows sub-queries, true for everything but mysql < 4.1
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*
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@ -349,13 +356,10 @@ class egw_db
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//error_log(__METHOD__."() this->Host(s)=$this->Host, n=$n --> host=$host");
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$new_connection = !$this->Link_ID || !$this->Link_ID->IsConnected();
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$this->_connect($host);
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// check Galera wsrep_local_state for node is not in state Synced, eg. Donor
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// check is only done for Type=mysql and will succed if no Galera
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if ($new_connection && $this->Type == 'mysql' && strpos($this->Host, ';') !== false &&
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($state = $this->query("SHOW STATUS LIKE 'wsrep_local_state'")->fetchColumn(1)) !== false &&
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$state != 4) // 4 = Synced
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// check if connected node is healty
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if ($new_connection && self::$health_check)
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{
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throw new egw_exception_db_connection('wsrep-local-state='.array2string($state).' != 4');
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call_user_func(self::$health_check, $this);
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}
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//error_log(__METHOD__."() host=$host, new_connection=$new_connection, this->Type=$this->Type, this->Host=$this->Host, wsrep_local_state=".array2string($state));
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return $this->Link_ID;
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@ -370,6 +374,32 @@ class egw_db
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throw $e;
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}
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/**
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* Check if just connected Galera cluster node is healthy / fully operational
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*
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* A node in state "Donor/Desynced" will block updates at the end of a SST.
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* Therefore we try to avoid that node, if we have an alternative.
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*
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* To enable this check add the following to your header.inc.php:
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*
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* egw_db::$health_check = array('egw_db', 'galera_cluster_health');
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*
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* @param egw_db $db already connected egw_db instance to check
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* @throws egw_exception_db_connection if node should NOT be used
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*/
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static function galera_cluster_health(egw_db $db)
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{
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if (($state = $db->query("SHOW STATUS WHERE Variable_name in ('wsrep_cluster_size','wsrep_local_state','wsrep_local_state_comment')")->GetAssoc()))
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{
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if ($state['wsrep_local_state_comment'] == 'Synced' ||
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// if we have only 2 nodes (2. one starting), we can only use the donor
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$state['wsrep_local_state_comment'] == 'Donor/Desynced' &&
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$state['wsrep_cluster_size'] == 2) return;
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throw new egw_exception_db_connection('Node is NOT Synced! '.array2string($state));
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}
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}
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/**
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* Get one of multiple (semicolon-separated) DB-hosts to use
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*
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