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# DREREDISTRIBUTE

Allows you to redistribute the index when you update the number or weight of child servers.

This index action has an effect only when you have set UseConsistentHashing to `true` in the DIH configuration file. If UseConsistentHashing is set to `false`, DIH forwards the index action to all its child servers.

Note: This index action is only available for the DIH, and has no effect if you send it directly to IDOL Server.

In consistent hashing mode, all content is distributed in virtual nodes, which the DIH assigns to one or more child servers. When you run the `DREREDISTRIBUTE` index action, DIH checks whether the child server architecture has changed. If there is a change, DIH automatically exports and indexes the content in virtual nodes to redistribute your data evenly between the available child servers.

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` returns the `Unavailable` error code and does not run.

For more details about consistent hashing mode, refer to the DIH Administration Guide.

## Example

    http://12.3.4.56:20001/DREREDISTRIBUTE

## Parameters

Parameter | Description | Required
--- | --- | ---
IndexUID | An identification code for any document tracking events. | see Comments

## Comments

For this index action, DIH uses the IndexUID parameter to identify the export index actions that it sends to its child servers, and the index actions the generate to index the redistributed data. If you do not specify an IndexUID, DIH generates one automatically to track the redistribution.

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