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A state transition can occur for many reasons–because of a Snaplex version update, a configuration change to the Snaplex, or a restart. When a state transition is required for a Snaplex, one node (or more for larger Snaplex instances) at a time enters a Cooldown state, in which new Pipeline execution requests are should not be not sent to the node. In this state, the node waits for currently running Pipelines to complete. For long-running Pipelines that are set up to poll continuously (like a Pipeline using File Poller or JMS Consumer Snaps) and Ultra Pipelines, the Pipeline is sent a state notification to allow the Pipeline to stop polling for new records.
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In the Cooldown state, a node can only accept requests if sent by the client directly. |
Pipeline Execution Timeout when Restarting a Snaplex
A node can stay in the Cooldown state for Snaplex has a configurable timeout (the default is 15 minutes), called the Restart Max Wait Time, which you can set in the Snaplex Settings tab in the Update Snaplex and Create Snaplex dialogs. If all Pipelines complete within this timeout, then the node transitions to the required state. If Pipelines are still running after this timeout, then those Pipelines terminate to allow the transition to the required state.
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