NDB Cluster Log Messages Log Message Description Event Name Event Type Priority Severity Node node1_id : Node node2_id declared dead due to missed heartbeat This node has missed at least 3 heartbeats from node node2_id , and so has declared that node  “dead” DeadDueToHeartbeat Error 8 ALERT Node node1_id : Node Sent Heartbeat to node = node2_id This node has sent a heartbeat to node  node2_id SentHeartbeat Info 12 INFO Node node_id : Event buffer status ( object_id ): used= bytes_used ( percent_used % of alloc) alloc= bytes_allocated max= bytes_available latest_consumed_epoch= latest_consumed_epoch latest_buffered_epoch= latest_buffered_epoch report_reason= report_reason This report is seen during heavy event buffer usage, for example, when many updates are being applied in a relatively short period of time; the report shows the number of bytes and the percentage of event buffer memory used, the bytes allocated and percentage still available, and the latest buffered and consumed epochs; for more information, see Section 23.5.2.3, “Event Buffer Reporting in the Cluster Log” EventBufferStatus2 Info 7 INFO Node node_id : Entering single user mode ,  Node node_id : Entered These reports are written to the cluster log when entering and exiting single user mode; API_node_id SingleUser Info 7 INFO 4457