Cache 2 suite test GridCacheDhtPreloadDelayedSelfTest failed on TC.

[2019-04-26 08:00:37,500][WARN ][test-runner-#27151%dht.GridCacheDhtPreloadDelayedSelfTest%][root] Check failed (will retry in 500ms).
java.lang.AssertionError
at org.apache.ignite.internal.processors.cache.distributed.dht.GridCacheDhtPreloadDelayedSelfTest$5.applyx(GridCacheDhtPreloadDelayedSelfTest.java:465)
at org.apache.ignite.internal.util.lang.GridAbsClosureX.apply(GridAbsClosureX.java:34)
at org.apache.ignite.testframework.GridTestUtils.retryAssert(GridTestUtils.java:1608)
at org.apache.ignite.internal.processors.cache.distributed.dht.GridCacheDhtPreloadDelayedSelfTest.checkMaps(GridCacheDhtPreloadDelayedSelfTest.java:442)
at org.apache.ignite.internal.processors.cache.distributed.dht.GridCacheDhtPreloadDelayedSelfTest.testDelayedPreload(GridCacheDhtPreloadDelayedSelfTest.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.apache.ignite.testframework.junits.GridAbstractTest$6.run(GridAbstractTest.java:2044)
at java.lang.Thread.run(Thread.java:748)