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25.4.2.4 Other NDB Cluster Configuration Parameters

The listings in this section provide information about parameters used in the[computer],[tcp], and[shm] sections of aconfig.ini file for configuring NDB Cluster. For detailed descriptions and additional information about individual parameters, seeSection 25.4.3.10, “NDB Cluster TCP/IP Connections”, orSection 25.4.3.12, “NDB Cluster Shared-Memory Connections”, as appropriate.

The following parameters apply to theconfig.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 theconfig.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.

  • RequireLinkTls: Read-only; is set to true if either endpoint of this connection requires TLS.

  • 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 theconfig.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.