Network Latency and Replication

High latency among clusters can cause replication jobs to run more slowly, but does not cause them to fail.

For best performance, latency between the source cluster NameNode and the destination cluster NameNode should be less than 80 milliseconds. (You can test latency using the Linux ping command.) Cloudera has successfully tested replications with latency of up to 360 milliseconds. As latency increases, replication performance degrades.