adarshsanjeev commented on code in PR #17899:
URL: https://github.com/apache/druid/pull/17899#discussion_r2039275089
##########
server/src/main/java/org/apache/druid/client/selector/ServerSelector.java:
##########
@@ -122,12 +122,17 @@
}
public List<DruidServerMetadata> getCandidates(final int numCandidates)
+ {
+ return getCandidates(numCandidates, HistoricalFilter.IDENTITIY_FILTER);
+ }
+
+ public List<DruidServerMetadata> getCandidates(final int numCandidates,
HistoricalFilter filter)
{
List<DruidServerMetadata> candidates;
synchronized (this) {
if (numCandidates > 0) {
candidates = new ArrayList<>(numCandidates);
- strategy.pick(historicalServers, segment.get(), numCandidates)
+ strategy.pick(filter.apply(historicalServers), segment.get(),
numCandidates)
Review Comment:
There's also one other thing, we also require filtering on `getAllServers()`
in ServerSelector, which does not rely on `TierSelectorStrategy.pick()`, so we
would need to have passed `HistoricalFilter` and query to this function anyway,
as one of the callers of `getAllServers()`
Another thing, we do not always have access to query context in
`AbstractTierSelectorStrategy`, the query parameter is nullable and is not
always supplied. The default implementation is to pass null.
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