tests/cg-recovery: retry on empty list groups res

Issues redpanda-data#10363 revealead that it is possible for a broker to service a
ListGroups request in a window where the leader-to-be is _becoming_ the
leader but the configuration has not replicated yet. This results in an
empty ListGroups response.

The fix is to retry the request.

Fixes redpanda-data#10363

Signed-off-by: NyaliaLui <[email protected]>

tests/rptest/tests/consumer_group_recovery_tool_test.py

@@ -19,6 +19,7 @@
 from rptest.services.rpk_producer import RpkProducer
 from rptest.tests.prealloc_nodes import PreallocNodesTest
 from rptest.tests.redpanda_test import RedpandaTest
+from rptest.util import wait_until_result
 from ducktape.utils.util import wait_until
 from ducktape.mark import parametrize
 
@@ -31,7 +32,6 @@ def __init__(self, test_ctx, *args, **kwargs):
             test_ctx,
             num_brokers=3,
             *args,
-            # disable leader balancer to make sure that group will not be realoaded because of leadership changes
             extra_rp_conf={
                 # clear topics from the the kafka_nodelete_topics to allow for
                 # __consumer_offsets to be configured in this test.
@@ -44,7 +44,19 @@ def __init__(self, test_ctx, *args, **kwargs):
     def describe_all_groups(self):
         rpk = RpkTool(self.redpanda)
         all_groups = {}
-        for g in rpk.group_list():
+
+        def do_list_groups():
+            res = rpk.group_list()
+            assert res is not None
+            return False if len(res) == 0 else (True, res)
+
+        group_list_res = wait_until_result(
+            do_list_groups,
+            timeout_sec=30,
+            backoff_sec=0.5,
+            err_msg="RPK failed to list consumer groups")
+
+        for g in group_list_res:
             gd = rpk.group_describe(g)
             all_groups[gd.name] = {}
             for p in gd.partitions: