NDB Cluster Log Messages • BUFFERED_EPOCHS_OVER_THRESHOLD : Whether the number of buffered epochs has exceeded the configured threshold. This number is the difference between the latest epoch that has been received in its entirety and the epoch that has most recently been consumed (in NDB API applications, this is done by calling  nextEvent()  or  nextEvent2() ). The report is generated every second until the number of buffered epochs goes below the threshold, which can be adjusted by setting the ndb_report_thresh_binlog_epoch_slip  server variable. You can also adjust the threshold in NDB API applications by calling  setEventBufferQueueEmptyEpoch() . • PARTIALLY_DISCARDING : Event buffer memory is exhausted—that is, 100% of ndb_eventbuffer_max_alloc  has been used. Any partially buffered epoch is buffered to completion even is usage exceeds 100%, but any new epochs received are discarded. This means that a gap has occurred in the event stream. • COMPLETELY_DISCARDING : No epochs are buffered. • PARTIALLY_BUFFERING : The buffer free percentage following the gap has risen to the threshold, which can be set in the  mysql  client using the  ndb_eventbuffer_free_percent  server system variable or in NDB API applications by calling  set_eventbuffer_free_percent() . New epochs are buffered. Epochs that could not be completed due to the gap are discarded. • COMPLETELY_BUFFERING : All epochs received are being buffered, which means that there is sufficient event buffer memory. The gap in the event stream has been closed. This section lists error codes, names, and messages that are written to the cluster log in the event of transporter errors. 23.5.2.4 NDB Cluster: NDB Transporter Errors 4461 0x00 TE_NO_ERROR No error 0x01 TE_ERROR_CLOSING_SOCKET Error found during closing of socket 0x02 TE_ERROR_IN_SELECT_BEFORE_ACCEPT Error found before accept. The transporter will retry 0x03 TE_INVALID_MESSAGE_LENGTH Error found in message (invalid message length) 0x04 TE_INVALID_CHECKSUM Error found in message (checksum) 0x05 TE_COULD_NOT_CREATE_SOCKET Error found while creating socket(can’t create socket) 0x06 TE_COULD_NOT_BIND_SOCKET Error found while binding server socket 0x07 TE_LISTEN_FAILED