NDB Cluster Configuration Files • Wan • HeartbeatThreadPriority • TotalSendBufferMemory 4067 • ExtraSendBufferMemory Use WAN TCP setting as default. Set the scheduling policy and priority of heartbeat threads for management and API nodes. The syntax for setting this parameter is shown here: When setting this parameter, you must specify a policy. This is one of  FIFO  (first in, first out) or  RR (round robin). The policy value is followed optionally by the priority (an integer). This parameter specifies the amount of transporter send buffer memory to allocate in addition to any that has been set using  TotalSendBufferMemory ,  SendBufferMemory , or both. HeartbeatThreadPriority =  policy [,  priority ] policy : {FIFO | RR} Version (or later) NDB 8.0.13 Type or units boolean Default false Range true, false Restart Type N (NDB 8.0.13) Version (or later) NDB 8.0.13 Type or units string Default [...] Range ... Restart Type N (NDB 8.0.13) Version (or later) NDB 8.0.13 Type or units bytes Default 0 Range 0 - 32G Restart Type N (NDB 8.0.13) Version (or later) NDB 8.0.13 Type or units bytes Default 0 Range 256K - 4294967039 (0xFFFFFEFF)