如何在单独的搜索链中使用 vespa.ai 中的多个文档处理器？

Question

I need to use multiple document processor in my vespa use case. I have a condition where I need to modify feeds based on different conditions. I can not use document processor chaining. It has to be a separate one which I can use every time I insert a feed. I have tried using the below server.xml configuration.

    <document-processing>
                <chain id="foo">
                    <documentprocessor
                        id="com.abc.xyz.Test" bundle="abc-xyz-one" />
                </chain>
    <chain id="bar">
                    <documentprocessor
                        id="com.abc.xyz.Test2" bundle="abc-xyz-one" />
                </chain>
    </document-processing>

Request http://<IP>:<port>/document/v1/test2/test2/docid/<id>/;&chain=foo

Here I am getting a timeout.

Answer 1

To add multiple document processors, use

<document-processing>
  <chain id="default">
    <documentprocessor id="com.abc.xyz.Test" bundle="abc-xyz-one" />
    <documentprocessor id="com.abc.xyz.Test2" bundle="abc-xyz-one" />
  </chain>
</document-processing>

(I don't think you want to here but if you need multiple chains, you need to configure routing. This is because you usually want to route to processing chains depending on operation attributes, not leave it up to clients.)

Answer 2

The /document/v1 http api (described here https://docs.vespa.ai/documentation/document-api.html ) does not support a chain parameter. It has a 'route' parameter which allows you to send messages through a route where hops along the route can be docproc chains.

It'a unclear what you really want to do but you can route document operations to different document processing chain by having a route per chain (Then the condition which route to sent to needs to be resolved outside of Vespa), see https://docs.vespa.ai/documentation/routing.html . The vespa-route command utility is very handy to figure out what the hop names are.