IGNITE-26965 Fixed flaky ReliabilityTest#testFailover test.

Author: petrov-mg

modules/core/src/test/java/org/apache/ignite/client/LocalIgniteCluster.java

@@ -41,7 +41,7 @@ public class LocalIgniteCluster implements AutoCloseable {
     private static final Random rnd = new Random();
 
     /** Servers. */
-    private final List<Ignite> srvs = new ArrayList<>();
+    public final List<Ignite> srvs = new ArrayList<>();
 
     /** Configurations of the failed servers. */
     private final List<NodeConfiguration> failedCfgs = new ArrayList<>();

modules/core/src/test/java/org/apache/ignite/client/ReliabilityTest.java

@@ -161,10 +161,20 @@ public void testFailover() throws Exception {
                     try (QueryCursor<Cache.Entry<Integer, String>> cur = cache.query(qry)) {
                         List<Cache.Entry<Integer, String>> res = cur.getAll();
 
-                        assertEquals("Unexpected number of entries", data.size(), res.size());
-
                         Map<Integer, String> act = res.stream()
-                                .collect(Collectors.toMap(Cache.Entry::getKey, Cache.Entry::getValue));
+                            .collect(Collectors.toMap(Cache.Entry::getKey, Cache.Entry::getValue));
+
+                        Map<Integer, Object> failover = null;
+
+                        if (data.size() != res.size()) {
+                            failover = data.entrySet().stream()
+                                .collect(Collectors.toMap(
+                                    Map.Entry::getKey,
+                                    e -> cluster.srvs.get(0).cache("testFailover").get(e.getKey()))
+                                );
+                        }
+
+                        assertEquals("Unexpected number of entries " + act + " " + failover, data.size(), res.size());
 
                         assertEquals("Unexpected entries", data, act);
                     }
@@ -770,8 +780,6 @@ private void waitRebalanceFinished() throws IgniteInterruptedCheckedException, I
                 ));
             }
         }
-
-        U.sleep(5000);
     }
 
     /** {@inheritDoc} */