caiconghui commented on code in PR #16037:
URL: https://github.com/apache/doris/pull/16037#discussion_r1081068103
##########
fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java:
##########
@@ -1542,10 +1541,34 @@ private void
computeColocateJoinInstanceParam(PlanFragmentId fragmentId,
}
}
+ private Map<TNetworkAddress, Long> getReplicaNumPerHost() {
+ Map<TNetworkAddress, Long> replicaNumPerHost = Maps.newHashMap();
+ for (ScanNode scanNode : scanNodes) {
+ List<TScanRangeLocations> locationsList =
scanNode.getScanRangeLocations(0);
+ if (locationsList == null) {
+ // only analysis olap scan node
+ continue;
+ }
+ for (TScanRangeLocations locations : locationsList) {
+ for (TScanRangeLocation location : locations.locations) {
+ if (replicaNumPerHost.containsKey(location.server)) {
+ replicaNumPerHost.put(location.server,
replicaNumPerHost.get(location.server) + 1L);
+ } else {
+ replicaNumPerHost.put(location.server, 1L);
+ }
+ }
+
+ }
+ }
+ return replicaNumPerHost;
+ }
+
// Populates scan_range_assignment_.
// <fragment, <server, nodeId>>
private void computeScanRangeAssignment() throws Exception {
- HashMap<TNetworkAddress, Long> assignedBytesPerHost =
Maps.newHashMap();
+ Map<TNetworkAddress, Long> assignedBytesPerHost = Maps.newHashMap();
+ Map<TNetworkAddress, Long> replicaNumPerHost = getReplicaNumPerHost();
+ Collections.shuffle(scanNodes);
Review Comment:
yes, for one query, it is necessary to shuffle scanNodes to make all
replicas shuffled
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