Relationship between the Elk database and HD

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Elk is an SQL on Hadoop solution. It is a component of HD and provides excellent SQL query performance and compatibility on HD.

Other related questions:
Differences between Elk and MPP
Elk is an SQL computing engine based on HD or HDFS. MPP is a parallel analytic database based on local disks.

Relationship between ZooKeeper and HDFS
ZooKeeper Failover Controller (ZKFC) is the client of a ZooKeeper cluster that monitors the status of HDFS NameNodes. The ZKFC process is deployed only on the node where a NameNode is deployed. It can be deployed on both the active and standby NameNodes.

Relationship between LOCAL_FAULT and REMOTE_FAULT
In general, the LOCAL_FAULT and REMOTE_FAULT alarms are concurrently generated. For example, if the LOCAL_FAULT alarm is reported on the local board, the REMOTE_FAULT alarm will be reported on the peer board. If the LOCAL_FAULT alarm is reported on both the local and peer tributary boards, the LOCAL_FAULT and REMOTE_FAULT alarms will be reported on the local tributary board.

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