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Chapter 14. Improving the latency in a multi-supplier replication environment

In certain multi-supplier replication environments, for example if the servers are connected over a wide area network (WAN), the replication latency can be high if multiple suppliers receive updates at the same time. This happens when one supplier exclusively accesses a replica without releasing it for a long time. In such situations, other suppliers cannot send updates to this consumer, which increases the replication latency.

To release a replica after a fixed amount of time, set the nsds5ReplicaReleaseTimeout parameter on suppliers and hubs.

Note

The 60 seconds default value is ideal for most environments. A value set too high or too low can have a negative impact on the replication performance. If you set the value too low, replication servers are constantly reacquiring each other, and servers are not able to send many updates. In a high-traffic replication environment, a longer timeout can improve situations where one supplier exclusively accesses a replica. However, in most cases, a value higher than 120 seconds slows down replication.

14.1. Setting the replication release timeout using the command line
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To improve the replication efficiency in a multi-supplier replication environment, update the replication release timeout value on all hubs and suppliers.

Prerequisites

  • You configured replication between multiple suppliers and hubs.

Procedure

  1. Set the timeout value for the suffix: 

    # dsconf <instance_name> replication set --suffix="dc=example,dc=com" --repl-release-timeout=70
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    This command changes the replication timeout of the example,dc=com suffix to 70 seconds.

  2. Restart the instance: 

    # dsctl <instance_name> restart
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14.2. Setting the replication release timeout using the web console
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To improve the replication efficiency in a multi-supplier replication environment, update the replication release timeout value on all hubs and suppliers.

Prerequisites

  • You configured replication between multiple suppliers and hubs.

Procedure

  1. On the Replication tab, select the suffix entry.
  2. Click Show Advanced Settings.
  3. Update the value in the Replication Release Timeout field.
  4. Click Save Configuration.
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