Configuring Gateways for Table and Stream Replication

Configuring gateways involves installing the mapr-gateway package on nodes in a MapR destination cluster and then configuring the MapR source cluster to communicate with the destination cluster. The MapR source cluster is configured by specifying the destination cluster's CLDB node and gateway nodes.

Although it is possible to use a single gateway, the recommended practice is to configure at least two (2), so that replication can continue if a gateway fails. MapR source clusters distribute requests among the gateways in a round-robin fashion. See Gateways for Replicating MapR-DB Tables, Table Replication, and Preparing Clusters for Stream Replication for more information about replication.

See Setting Up Cross-Cluster Security for more information about setting up cross-cluster security including cross-cluster security for table and stream replication.

  1. On the destination cluster, install the mapr-gateway package on each node where you want to run a gateway on. See Installing MapR Software.
    Note: On the gateway nodes in the destination cluster, when you run (or re-run) the configure.sh script (in addition to your regular parameters) be sure to specify the -N parameter with the name of the cluster that the gateway belongs to. See configure.sh for more information about configure.sh usage, options, and examples.
  2. If you want to change the port that a gateway is using (by default, gateways use port 7660):
    1. On the node where the gateway is running, edit the /opt/mapr/conf/gateway.conf file, uncommenting the line #gateway.port=7660 and changing the port number.
    2. After saving the file, restart the gateway by running this command: maprcli node services -name gateway -action restart
  3. On the source cluster, specify the destination cluster's name and gateway nodes by using one of the following methods:
    • Run the maprcli cluster gateway set command:
      maprcli cluster gateway set -dstcluster <cluster name> -gateways <space-delimited list of gateways>

      The following sample command sets two gateway nodes on the destination cluster my.cluster.com:

      maprcli cluster gateway set -dstcluster my.cluster.com -gateways node1.com node2.com
    • Add a DNS record to your DNS server's zone file for your domain.

    If you do not perform one of these options, MapR-DB uses configuration from the mapr-clusters.conf file. It uses the cluster name specified in that file as the destination cluster and the CLDB node addresses as the gateway nodes. You must have gateways running on these CLDB nodes.

    See Managing Gateways for more information about using these methods.