Add, Change, and Remove Child Servers in Consistent Hashing Mode

In consistent hashing mode, you can add or remove child servers, and change the weight of a child server, without reindexing all your content. This process uses the EngineManagement action and the DREREDISTRIBUTE index action to change your child server arrangement and redistribute the data respectively.

When the DIH receives a DREREDISTRIBUTE index action, it checks whether redistribution is required. If it is, the DIH remaps the virtual nodes, and automatically sends export and add index actions to its child servers to redistribute the associated content.

NOTE:

DIH can process only one DREREDISTRIBUTE index action at the same time. If it starts to process a second DREREDISTRIBUTE index action in the queue before all child servers have finished redistributing the content, the second DREREDISTRIBUTE index action returns the Unavailable error code and does not run.

Add a New Child Server

Use the following procedure to add a new child server in consistent hashing mode.

Change the Weight of a Child Server

Use the following procedure to change the weight of a child server in consistent hashing mode.

Remove a Child Server

Use the following procedure to remove a child server group in consistent hashing mode. You cannot remove a group that has virtual nodes assigned, and you can remove only whole groups of servers.


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