leventov commented on a change in pull request #7595: Optimize overshadowed
segments computation
URL: https://github.com/apache/incubator-druid/pull/7595#discussion_r288704366
##########
File path:
server/src/main/java/org/apache/druid/metadata/SQLMetadataSegmentManager.java
##########
@@ -615,29 +619,30 @@ public ImmutableDruidDataSource getDataSource(String
dataSourceName)
@Nullable
public Collection<ImmutableDruidDataSource> getDataSources()
{
- return Optional.ofNullable(dataSources)
- .map(m ->
- m.values()
- .stream()
- .map(DruidDataSource::toImmutableDruidDataSource)
- .collect(Collectors.toList())
- )
- .orElse(null);
+ return Optional.ofNullable(dataSourcesSnapshot).map(m ->
m.getDataSources()).orElse(null);
}
@Override
@Nullable
public Iterable<DataSegment> iterateAllSegments()
{
- final ConcurrentHashMap<String, DruidDataSource> dataSourcesSnapshot =
dataSources;
- if (dataSourcesSnapshot == null) {
+ final Collection<ImmutableDruidDataSource> dataSources =
Optional.ofNullable(dataSourcesSnapshot)
+ .map(m ->
m.getDataSources())
+
.orElse(null);
+ if (dataSources == null) {
return null;
}
- return () -> dataSourcesSnapshot.values()
- .stream()
- .flatMap(dataSource ->
dataSource.getSegments().stream())
- .iterator();
+ return () -> dataSources.stream()
+ .flatMap(dataSource ->
dataSource.getSegments().stream())
+ .iterator();
+ }
+
+ @Override
+ @Nullable
+ public Set<SegmentId> getOvershadowedSegments()
Review comment:
Just wrapping/unwrapping objects into snapshot doesn't magically eliminate
the race. You have to pass around the snapshot.
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