adutra commented on code in PR #1896:
URL:
https://github.com/apache/cassandra-java-driver/pull/1896#discussion_r1468438125
##########
core/src/main/java/com/datastax/oss/driver/internal/core/loadbalancing/BasicLoadBalancingPolicy.java:
##########
@@ -322,20 +336,41 @@ protected Queue<Node> maybeAddDcFailover(@Nullable
Request request, @NonNull Que
}
QueryPlan remote =
new LazyQueryPlan() {
-
@Override
protected Object[] computeNodes() {
Object[] remoteNodes =
liveNodes.dcs().stream()
.filter(Predicates.not(Predicates.equalTo(localDc)))
- .flatMap(dc ->
liveNodes.dc(dc).stream().limit(maxNodesPerRemoteDc))
+ .sorted(
+ Comparator.comparingInt(
+ dc -> {
+ int i = preferredRemoteDcs.indexOf(dc);
+ return i < 0 ? Integer.MAX_VALUE : i;
+ }))
+ .flatMap(
+ dc -> {
+ if (preferredRemoteDcs.isEmpty()) {
Review Comment:
```suggestion
if (maxNodesPerRemoteDc == 1 ||
preferredRemoteDcs.isEmpty()) {
```
##########
core/src/main/java/com/datastax/oss/driver/internal/core/loadbalancing/BasicLoadBalancingPolicy.java:
##########
@@ -322,20 +336,41 @@ protected Queue<Node> maybeAddDcFailover(@Nullable
Request request, @NonNull Que
}
QueryPlan remote =
new LazyQueryPlan() {
-
@Override
protected Object[] computeNodes() {
Object[] remoteNodes =
liveNodes.dcs().stream()
.filter(Predicates.not(Predicates.equalTo(localDc)))
- .flatMap(dc ->
liveNodes.dc(dc).stream().limit(maxNodesPerRemoteDc))
+ .sorted(
+ Comparator.comparingInt(
+ dc -> {
+ int i = preferredRemoteDcs.indexOf(dc);
+ return i < 0 ? Integer.MAX_VALUE : i;
+ }))
+ .flatMap(
+ dc -> {
+ if (preferredRemoteDcs.isEmpty()) {
+ return
liveNodes.dc(dc).stream().limit(maxNodesPerRemoteDc);
+ } else {
+ final Object[] nodesPerRemoteDc =
+
liveNodes.dc(dc).stream().limit(maxNodesPerRemoteDc).toArray();
+ if (nodesPerRemoteDc.length > 0) {
Review Comment:
```suggestion
if (nodesPerRemoteDc.length > 1) {
```
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