If your cluster has clients installed on hosts with limited resources, HDFS replication
may use these hosts to run commands for the replication, which can cause performance
degradation. You can limit HDFS replication to run only on selected DataNodes by specifying a
"whitelist" of DataNode hosts.
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Click .
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Type
HDFS Replication in the search box.
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Locate the HDFS Replication Environment Advanced Configuration Snippet (Safety
Valve) property.
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Add the HOST_WHITELIST property. Enter a comma-separated list of DataNode hostnames to
use for HDFS replication. For example:
HOST_WHITELIST=host-1.mycompany.com,host-2.mycompany.com
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Click Save Changes to commit the changes.
