Enabling Fast Failover of Services

Describes the Fast Failover feature that allows a cluster to rapidly detect and recover from network failures.

For running a cluster with Fast Failover characteristics, enable the Fast Failover feature:

/opt/mapr/bin/maprcli config save -values {mfs.feature.fastfailover:1}

If you have enabled the fast failover feature, when the MapR Filesystem detects a failed node, it very quickly declares the node as being down. Clients experience a short latency period while the failure is being detected. Once MapR detects the failure, MapR redirects clients of the failed node to an alternate location (a replica container) for the data. If you have not enabled the fast failover feature, the MapR Filesystem repeatedly contacts the failed node.

This feature is enabled on all new installations. For upgrade installations, this feature is not enabled by default. You need to evaluate whether this feature works well with your existing infrastructure, before enabling it. You cannot turn this feature off after turning it on.