Thesharing commented on a change in pull request #16687:
URL: https://github.com/apache/flink/pull/16687#discussion_r688227194



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/LocalInputPreferredSlotSharingStrategy.java
##########
@@ -94,12 +98,34 @@ public LocalInputPreferredSlotSharingStrategy create(
         private final Map<ExecutionVertexID, ExecutionSlotSharingGroup>
                 executionSlotSharingGroupMap;
 
-        final Map<CoLocationConstraint, ExecutionSlotSharingGroup>
+        private final Map<CoLocationConstraint, ExecutionSlotSharingGroup>
                 constraintToExecutionSlotSharingGroupMap;
 
-        final Map<SlotSharingGroupId, List<ExecutionSlotSharingGroup>> 
executionSlotSharingGroups;
+        private final Map<SlotSharingGroupId, List<ExecutionSlotSharingGroup>>
+                executionSlotSharingGroups;
 
-        private final Map<ExecutionSlotSharingGroup, Set<JobVertexID>> 
assignedJobVerticesForGroups;
+        /**
+         * A JobVertex only belongs to a {@link SlotSharingGroup}. A 
SlotSharingGroup is
+         * corresponding to a set of {@link ExecutionSlotSharingGroup}s. We 
can maintain available
+         * ExecutionSlotSharingGroups for each JobVertex.
+         *
+         * <p>Once an ExecutionSlotSharingGroup is created, it becomes 
available for all JobVertices
+         * in the corresponding SlotSharingGroup in the beginning.
+         *
+         * <p>Once a SchedulingExecutionVertex is added to the 
ExecutionSlotSharingGroup, the group
+         * is no longer available for other SchedulingExecutionVertices 
corresponding to the same
+         * JobVertex.
+         */
+        private final Map<JobVertexID, Set<ExecutionSlotSharingGroup>> 
availableGroupsForJobVertex;
+
+        /**
+         * Maintains the available {@link ExecutionSlotSharingGroup}s for 
every {@link
+         * ConsumedPartitionGroup}. The available groups are computed in {@link
+         * this#computeAllAvailableGroupsForConsumedPartitionGroup} when the 
ConsumedPartitionGroup
+         * is traversed for the first time.
+         */
+        private final Map<ConsumedPartitionGroup, 
Set<ExecutionSlotSharingGroup>>
+                availableProducerGroupsForConsumedPartitionGroup;

Review comment:
       I've tried to improve the doc.




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