16. Disaster Recovery : Master Node Recovery : Data Locality after Failover
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Data Locality after Failover
After failover occurs, most data on HDFS will no longer be available locally, which can result in a significant performance overhead.
To resolve this, a REWRITE operation (see  HA Configuration Parameters) can be run as part of the failover process to re-locate the data. Doing so, however, can take a significant amount of time and will increase the total amount of time VectorH is down. For details, see How to Add and Remove Slave Nodes.