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A Ray task can name an existing KubeRay RayCluster in the task config key ray.existing_cluster. The plugin then emits a RayJob with clusterSelector instead of a cluster spec, so the task runs as the job driver on that cluster. KubeRay never deletes a selected cluster; shutdown and TTL stay unset. The key is read from TaskTemplate.config and from the container config, where the Flyte 2 SDK's config() hook writes it. Selector jobs may carry no custom. The task container's literal env vars are forwarded to the driver through runtime_env.env_vars, since the driver runs on the cluster's head instead of the task pod. The submitter pod uses the task image with KubeRay's default submitter resources. SidecarMode is rejected because KubeRay does not support it for selector jobs. The mode is off by default (allowExistingCluster): the driver runs with the selected cluster's identity, so operators opt in. Signed-off-by: Christian <chjdev@users.noreply.github.com>
KubeRay sets JobDeploymentStatus ValidationFailed for a RayJob spec it rejects. GetTaskPhase returned an unknown-status error, so the task was retried as a system error. It now fails with KubeRay's message, and IsTerminal reports the status as terminal. Signed-off-by: Christian <chjdev@users.noreply.github.com>
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