kafka: fix holding of attached_partition

We previously accessed the iterator, when we really should be using the pointer to the partition.
redpanda-data · Dec 17, 2023 · 8ba57f4 · 8ba57f4
1 parent 9135f9e
commit 8ba57f4
Showing 1 changed file with 16 additions and 13 deletions.
diff --git a/src/v/kafka/server/group_manager.cc b/src/v/kafka/server/group_manager.cc
@@ -626,19 +626,20 @@ ss::future<> group_manager::reload_groups() {
 
 ss::future<group_offsets_snapshot_result>
 group_manager::snapshot_groups(const model::ntp& ntp) {
-    auto attached_partition = _partitions.find(ntp);
-    if (attached_partition == _partitions.end()) {
+    auto it = _partitions.find(ntp);
+    if (it == _partitions.end()) {
         co_return cluster::cloud_metadata::error_outcome::ntp_not_found;
     }
+    auto attached_partition = it->second;
     // Avoid overlapping with concurrent reloads of the partition.
     auto units = co_await ss::get_units(
-      attached_partition->second->sem, 1, attached_partition->second->as);
-    auto& catchup = attached_partition->second->catchup_lock;
+      attached_partition->sem, 1, attached_partition->as);
+    auto& catchup = attached_partition->catchup_lock;
     auto read_lock = co_await catchup->hold_read_lock();
-    if (!attached_partition->second->partition->is_leader()) {
+    if (!attached_partition->partition->is_leader()) {
         co_return cluster::cloud_metadata::error_outcome::not_ready;
     }
-    if (attached_partition->second->loading) {
+    if (attached_partition->loading) {
         co_return cluster::cloud_metadata::error_outcome::not_ready;
     }
     group_offsets_snapshot snap;
@@ -694,18 +695,20 @@ group_manager::recover_offsets(group_offsets_snapshot snap) {
       "Received request to recover {} groups from snapshot on partition {}",
       snap.groups.size(),
       offsets_ntp);
-    auto p = _partitions.find(offsets_ntp);
-    if (p == _partitions.end()) {
-        co_return kafka::error_code::not_leader_for_partition;
+    auto it = _partitions.find(offsets_ntp);
+    if (it == _partitions.end()) {
+        co_return cluster::cloud_metadata::error_outcome::ntp_not_found;
     }
-    auto units = co_await ss::get_units(p->second->sem, 1, p->second->as);
-    if (!p->second->partition->is_leader()) {
+    auto attached_partition = it->second;
+    auto units = co_await ss::get_units(
+      attached_partition->sem, 1, attached_partition->as);
+    if (!attached_partition->partition->is_leader()) {
         co_return kafka::error_code::not_leader_for_partition;
     }
-    if (p->second->loading) {
+    if (attached_partition->loading) {
         co_return kafka::error_code::coordinator_load_in_progress;
     }
-    auto lock = co_await p->second->catchup_lock->hold_write_lock();
+    auto lock = co_await attached_partition->catchup_lock->hold_write_lock();
 
     vlog(
       klog.info,