jahstreet commented on code in PR #1896:
URL:
https://github.com/apache/cassandra-java-driver/pull/1896#discussion_r1983231999
##########
core/src/main/java/com/datastax/oss/driver/api/core/config/OptionsMap.java:
##########
@@ -381,6 +381,8 @@ protected static void fillWithDriverDefaults(OptionsMap
map) {
map.put(TypedDriverOption.LOAD_BALANCING_DC_FAILOVER_MAX_NODES_PER_REMOTE_DC,
0);
map.put(TypedDriverOption.LOAD_BALANCING_DC_FAILOVER_ALLOW_FOR_LOCAL_CONSISTENCY_LEVELS,
false);
map.put(TypedDriverOption.METRICS_GENERATE_AGGREGABLE_HISTOGRAMS, true);
+ map.put(
+ TypedDriverOption.LOAD_BALANCING_DC_FAILOVER_PREFERRED_REMOTE_DCS,
ImmutableList.of(""));
Review Comment:
Hi @nitinitt . Thanks for this contribution, very useful.
While testing it on my side, I've stumbled upon this default (we use
OptionsMap for configuring the driver). With this default, we never go to
[`buildRemoteQueryPlanAll`](https://github.com/apache/cassandra-java-driver/pull/1896/files#diff-bbdb6181132c9a28e06a98058d5b3db08d3398ffb4233f242f8da44b26a9249bR333-R334)
and fall into `buildRemoteQueryPlanPreferred`, which obviously cannot find
nodes of the DC `""`.
Was this set intentionally to default to a Set with empty string for some
reason?
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