4.2.4 Other NDB Cluster Configuration Parameters

The listings in this section provide information about parameters used in the [computer], [tcp], and [shm] sections of a config.ini file for configuring NDB Cluster. For detailed descriptions and additional information about individual parameters, see Section 4.3.10, “NDB Cluster TCP/IP Connections”, or Section 4.3.12, “NDB Cluster Shared-Memory Connections”, as appropriate.

The following parameters apply to the config.ini file's [computer] section:

• HostName: Host name or IP address of this computer.

• Id: Unique identifier for this computer.

The following parameters apply to the config.ini file's [tcp] section:

• AllowUnresolvedHostNames: When false (default), failure by management node to resolve host name results in fatal error; when true, unresolved host names are reported as warnings only.

• Checksum: If checksum is enabled, all signals between nodes are checked for errors.

• Group: Used for group proximity; smaller value is interpreted as being closer.

• HostName1: Name or IP address of first of two computers joined by TCP connection.

• HostName2: Name or IP address of second of two computers joined by TCP connection.

• NodeId1: ID of node (data node, API node, or management node) on one side of connection.

• NodeId2: ID of node (data node, API node, or management node) on one side of connection.

• NodeIdServer: Set server side of TCP connection.

• OverloadLimit: When more than this many unsent bytes are in send buffer, connection is considered overloaded.

• PreferIPVersion: Indicate DNS resolver preference for IP version 4 or 6.

• PreSendChecksum: If this parameter and Checksum are both enabled, perform pre-send checksum checks, and check all TCP signals between nodes for errors.

• Proxy: ....

• ReceiveBufferMemory: Bytes of buffer for signals received by this node.

• SendBufferMemory: Bytes of TCP buffer for signals sent from this node.

• SendSignalId: Sends ID in each signal. Used in trace files. Defaults to true in debug builds.

• TcpSpinTime: Time to spin before going to sleep when receiving.

• TCP_MAXSEG_SIZE: Value used for TCP_MAXSEG.

• TCP_RCV_BUF_SIZE: Value used for SO_RCVBUF.

• TCP_SND_BUF_SIZE: Value used for SO_SNDBUF.

• TcpBind_INADDR_ANY: Bind InAddrAny instead of host name for server part of connection.

The following parameters apply to the config.ini file's [shm] section:

• Checksum: If checksum is enabled, all signals between nodes are checked for errors.

• Group: Used for group proximity; smaller value is interpreted as being closer.

• HostName1: Name or IP address of first of two computers joined by SHM connection.

• HostName2: Name or IP address of second of two computers joined by SHM connection.

• NodeId1: ID of node (data node, API node, or management node) on one side of connection.

• NodeId2: ID of node (data node, API node, or management node) on one side of connection.

• NodeIdServer: Set server side of SHM connection.

• OverloadLimit: When more than this many unsent bytes are in send buffer, connection is considered overloaded.

• PreSendChecksum: If this parameter and Checksum are both enabled, perform pre-send checksum checks, and check all SHM signals between nodes for errors.

• SendBufferMemory: Bytes in shared memory buffer for signals sent from this node.

• SendSignalId: Sends ID in each signal. Used in trace files.

• ShmKey: Shared memory key; when set to 1, this is calculated by NDB.

• ShmSpinTime: When receiving, number of microseconds to spin before sleeping.

• ShmSize: Size of shared memory segment.

• Signum: Signal number to be used for signalling.