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.