Intermittent test fail on BatchMessageTest.testSimpleBatchProducerConsumer

[merlimat]

Output from Travis build:

com.yahoo.pulsar.client.admin.internal.BrokerStatsImpl$$EnhancerByMockitoWithCGLIB$$fb883741@6b353df8
Tests run: 361, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 831.053 sec <<< FAILURE! - in TestSuite
testSimpleBatchProducerConsumer(com.yahoo.pulsar.broker.service.BatchMessageTest)  Time elapsed: 0.306 sec  <<< FAILURE!
java.lang.AssertionError: expected [0] but found [4]
    at com.yahoo.pulsar.broker.service.BatchMessageTest.testSimpleBatchProducerConsumer(BatchMessageTest.java:293)

[radekg]

FYI: I have not experienced this while working on #26

[radekg]

@merlimat I just tried the following pr https://github.com/radekg/pulsar/pull/5/files on this test, modified, changed the invocationCount

    @Test(invocationCount = 1000)
    public void testNonBatchCumulativeAckAfterBatchPublish() throws Exception {
      ...

and I do not have any failures locally. However, looking at the failure in another random place on the linked PR (direct travis URI: https://travis-ci.org/radekg/pulsar/builds/163260260), I think the intermittent errors are caused by using sync tests on an async code.

[radekg]

The next commit passes: https://travis-ci.org/radekg/pulsar/builds/163267361. Slightest blip on the main thread and some tests collapse.

[merlimat]

Didn't see this failure in long time, closing for now