YARN-3623. Add a config to indicate the Timeline Service version. Contributed by Xuan Gong.
(cherry picked from commit f910e4f639
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<description>Indicate what is the current version of the running
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<description>Indicate what is the current version of the running
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timeline service. For example, if "yarn.timeline-service.version" is 1.5,
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timeline service. For example, if "yarn.timeline-service.version" is 1.5,
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and "yarn.timeline-service.enabled" is true, it means the cluster will and
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and "yarn.timeline-service.enabled" is true, it means the cluster will and
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should bring up the timeline service v.1.5.
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should bring up the timeline service v.1.5 (and nothing else).
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On the client side, if the client uses the same version of timeline service,
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On the client side, if the client uses the same version of timeline service,
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it should succeed. If the client chooses to use a smaller version in spite of this,
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it should succeed. If the client chooses to use a smaller version in spite of this,
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then depending on how robust the compatibility story is between versions,
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then depending on how robust the compatibility story is between versions,
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