gianm commented on a change in pull request #7595: Optimize overshadowed
segments computation
URL: https://github.com/apache/incubator-druid/pull/7595#discussion_r288015270
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File path:
server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorRuleRunner.java
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@@ -84,8 +85,10 @@ public DruidCoordinatorRuntimeParams
run(DruidCoordinatorRuntimeParams params)
// find available segments which are not overshadowed by other segments in
DB
// only those would need to be loaded/dropped
// anything overshadowed by served segments is dropped automatically by
DruidCoordinatorCleanupOvershadowed
- final Set<DataSegment> overshadowed = ImmutableDruidDataSource
- .determineOvershadowedSegments(params.getAvailableSegments());
+ // If metadata store hasn't been polled yet, use empty overshadowed list
+ final Collection<DataSegment> overshadowed = Optional
Review comment:
Keep this as a Set, please. Later on, we're doing
`overshadowed.contains(segment)`, and that's scary if `overshadowed` is any
kind of Collection other than a Set (or very short List).
By the way, it would be clearer to make this a `Set<SegmentId>` rather than
`Set<DataSegment>`.
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