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The execution subsystem is responsible for the execution of long running tasks on each
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index node. It lives in the [index-service](../services-core/index-service) module.
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It accomplishes this using the [message queue and actor library](../libraries/message-queue/),
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which permits program state to survive crashes and reboots.
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The subsystem exposes four [APIs](api/src/main/protobuf/executor-api.proto):
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* Execution API - for starting and stopping tasks, also contains miscellaneous commands
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* Crawl API - for managing the crawl workflow
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* Sideload API - for sideloading data
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* Export API - for exporting data
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