fix: Don't default roleGroup replicas to zero when not specified (#402)

* fix: Don't default roleGroup replicas to zero when not specified

* changelog

Author: sbernauer

CHANGELOG.md

@@ -16,11 +16,16 @@ All notable changes to this project will be documented in this file.
 - Let secret-operator handle certificate conversion ([#392]).
 - `operator-rs` `0.44.0` -> `0.52.0` ([#381], [#394], [#404]).
 
+### Fixed
+
+- Don't default roleGroup replicas to zero when not specified ([#402]).
+
 [#378]: https://github.com/stackabletech/hdfs-operator/pull/378
 [#381]: https://github.com/stackabletech/hdfs-operator/pull/381
 [#384]: https://github.com/stackabletech/hdfs-operator/pull/384
 [#392]: https://github.com/stackabletech/hdfs-operator/pull/392
 [#394]: https://github.com/stackabletech/hdfs-operator/pull/394
+[#402]: https://github.com/stackabletech/hdfs-operator/pull/402
 [#404]: https://github.com/stackabletech/hdfs-operator/pull/404
 
 ## [23.7.0] - 2023-07-14

rust/crd/src/lib.rs

@@ -377,23 +377,17 @@ impl HdfsRole {
     }
 
     /// Return replicas for a certain rolegroup.
-    pub fn role_group_replicas(&self, hdfs: &HdfsCluster, role_group: &str) -> i32 {
+    pub fn role_group_replicas(&self, hdfs: &HdfsCluster, role_group: &str) -> Option<u16> {
         match self {
             HdfsRole::NameNode => hdfs
                 .namenode_rolegroup(role_group)
-                .and_then(|rg| rg.replicas)
-                .unwrap_or_default()
-                .into(),
+                .and_then(|rg| rg.replicas),
             HdfsRole::DataNode => hdfs
                 .datanode_rolegroup(role_group)
-                .and_then(|rg| rg.replicas)
-                .unwrap_or_default()
-                .into(),
+                .and_then(|rg| rg.replicas),
             HdfsRole::JournalNode => hdfs
                 .journalnode_rolegroup(role_group)
-                .and_then(|rg| rg.replicas)
-                .unwrap_or_default()
-                .into(),
+                .and_then(|rg| rg.replicas),
         }
     }
 

rust/operator/src/hdfs_controller.rs

@@ -694,7 +694,9 @@ fn rolegroup_statefulset(
             .build(),
         spec: Some(StatefulSetSpec {
             pod_management_policy: Some("OrderedReady".to_string()),
-            replicas: Some(role.role_group_replicas(hdfs, &rolegroup_ref.role_group)),
+            replicas: role
+                .role_group_replicas(hdfs, &rolegroup_ref.role_group)
+                .map(i32::from),
             selector: LabelSelector {
                 match_labels: Some(role_group_selector_labels(
                     hdfs,