morningman commented on code in PR #16574:
URL: https://github.com/apache/doris/pull/16574#discussion_r1102669638
##########
fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java:
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@@ -1768,12 +1797,56 @@ public TScanRangeLocation
selectBackendsByRoundRobin(List<TScanRangeLocation> lo
return location;
}
+ private void computeScanRangeAssignmentByConsistentHash(
+ ScanNode scanNode,
+ final List<TScanRangeLocations> locations,
+ FragmentScanRangeAssignment assignment,
+ Map<TNetworkAddress, Long> assignedBytesPerHost,
+ Map<TNetworkAddress, Long> replicaNumPerHost) throws Exception {
+ Collection<Backend> aliveBEs =
idToBackend.values().stream().filter(SimpleScheduler::isAvailable)
+ .collect(Collectors.toList());
+ if (aliveBEs.isEmpty()) {
+ throw new UserException("No available backends");
+ }
+ int virtualNumber = Math.max(Math.min(512 / aliveBEs.size(), 32), 2);
+ ConsistentHash<TScanRangeLocations, Backend> consistentHash = new
ConsistentHash<>(
Review Comment:
TODO: I think we can move this ConsistentHash to `SystemInfoService`.
No need to create one for every query
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