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1. Automatic failover. (Example: switch request from not responding name-node to active name-node.)
2. Pluggable support of failover strategies.
3. Daemon-service for regular ping of Hadoop service state (Performance optimization to keeping actual state of service).

Architecture

New provider will be added (descendant ProviderDeploymentContributorBase class) with a set of filters. See Pic.#1 for common architecture.

Pic. #1 – Providers architecture

Definition. 

Alias – set of Hadoop name-nodes configured for High Availability mode. 

Definition.

High Availability Strategy – plan of defining active name-node and switching between active and stand-by name-nodes. Strategy may contain such parameters as retryCount and timeoutInterval. See Pic.#2 for class diagram for HA mode.

 See

Pic.#2

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Class diagram for HA mode.

See Table #1 for class description.

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