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Using MarkLogic Content Pump (mlcp)

Restricting the Hosts That mlcp Uses to Connect to MarkLogic

You can restrict the hosts to which mlcp distributes work using the -restrict_hosts and -host command line options. You might find this option combination useful in situations such as the following:

  • Limit the host working set to just the e-nodes in your cluster.

  • The public and private DNS names of a host differ, such as can occur for an AWS instance.

    Note

    MarkLogic automatically sets -restrict_hosts to true when it detects the presence of a load balancer.

When -restrict_hosts is set to true, mlcp will only connect to the hosts listed in the -host option, rather than using the approach described in How mlcp Uses the Host List.

Note

Using -restrict_hosts will usually degrade the performance of an mlcp job because mlcp cannot distribute work as efficiently.

For example, if you’re using mlcp with a load balancer between your client and your MarkLogic cluster, you can specify the load balancer with -host and set -restrict_hosts to true to prevent mlcp from attempting to bypass the load balancer and connect directly to the forest hosts.

You can restrict the mlcp host list when using the import, export, and copy commands. For import and export, use the -host and -restrict_hosts options. For copy, use -input_host and -restrict_input_hosts and/or -output_host and -restrict_output_hosts.

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