[MINOR][DOCS] Fix a typo in ContainerPlacementStrategy's class comment
### What changes were proposed in this pull request? This PR fixes a typo in deploy/yarn/LocalityPreferredContainerPlacementStrategy.scala file. ### Why are the changes needed? To deliver correct explanation about how the placement policy works. ### Does this PR introduce any user-facing change? No ### How was this patch tested? UT as specified, although shouldn't influence any functionality since it's in the comment. Closes #28267 from asclepiusaka/master. Authored-by: Cong Du <asclepius1993@gmail.com> Signed-off-by: Sean Owen <srowen@gmail.com>
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@ -40,7 +40,7 @@ private[yarn] case class ContainerLocalityPreferences(nodes: Array[String], rack
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* and cpus per task is 1, so the required container number is 15,
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* and host ratio is (host1: 30, host2: 30, host3: 20, host4: 10).
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*
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* 1. If requested container number (18) is more than the required container number (15):
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* 1. If the requested container number (18) is more than the required container number (15):
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*
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* requests for 5 containers with nodes: (host1, host2, host3, host4)
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* requests for 5 containers with nodes: (host1, host2, host3)
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@ -63,16 +63,16 @@ private[yarn] case class ContainerLocalityPreferences(nodes: Array[String], rack
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* follow the method of 1 and 2.
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*
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* 4. If containers exist and some of them can match the requested localities.
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* For example if we have 1 containers on each node (host1: 1, host2: 1: host3: 1, host4: 1),
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* For example if we have 1 container on each node (host1: 1, host2: 1: host3: 1, host4: 1),
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* and the expected containers on each node would be (host1: 5, host2: 5, host3: 4, host4: 2),
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* so the newly requested containers on each node would be updated to (host1: 4, host2: 4,
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* host3: 3, host4: 1), 12 containers by total.
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*
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* 4.1 If requested container number (18) is more than newly required containers (12). Follow
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* method 1 with updated ratio 4 : 4 : 3 : 1.
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* method 1 with an updated ratio 4 : 4 : 3 : 1.
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*
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* 4.2 If request container number (10) is more than newly required containers (12). Follow
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* method 2 with updated ratio 4 : 4 : 3 : 1.
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* 4.2 If request container number (10) is less than newly required containers (12). Follow
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* method 2 with an updated ratio 4 : 4 : 3 : 1.
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*
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* 5. If containers exist and existing localities can fully cover the requested localities.
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* For example if we have 5 containers on each node (host1: 5, host2: 5, host3: 5, host4: 5),
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