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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.

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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.

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.

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.

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Relationship between the Elk database and HD

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