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https://issues.apache.org/jira/browse/KAFKA-8263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861788#comment-16861788
]
Boyang Chen commented on KAFKA-8263:
------------------------------------
```
[2019-06-11 04:24:38,981] WARN [RequestSendThread controllerId=0] Controller
0's connection to broker localhost:32938 (id: 0 rack: null) was unsuccessful
(kafka.controller.RequestSendThread:72)
java.io.IOException: Connection to localhost:32938 (id: 0 rack: null) failed.
at
org.apache.kafka.clients.NetworkClientUtils.awaitReady(NetworkClientUtils.java:71)
at
kafka.controller.RequestSendThread.brokerReady(ControllerChannelManager.scala:295)
at kafka.controller.RequestSendThread.doWork(ControllerChannelManager.scala:249)
at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:89)``` Seems
some connection exception occurred.
> Flaky Test MetricsIntegrationTest#testStreamMetricOfWindowStore
> ---------------------------------------------------------------
>
> Key: KAFKA-8263
> URL: https://issues.apache.org/jira/browse/KAFKA-8263
> Project: Kafka
> Issue Type: Bug
> Components: streams, unit tests
> Affects Versions: 2.3.0
> Reporter: Matthias J. Sax
> Assignee: Bruno Cadonna
> Priority: Major
> Labels: flaky-test
> Fix For: 2.4.0
>
>
> [https://builds.apache.org/job/kafka-pr-jdk11-scala2.12/3900/testReport/junit/org.apache.kafka.streams.integration/MetricsIntegrationTest/testStreamMetricOfWindowStore/]
> {quote}java.lang.AssertionError: Condition not met within timeout 10000.
> testStoreMetricWindow -> Size of metrics of type:'put-latency-avg' must be
> equal to:2 but it's equal to 0 expected:<2> but was:<0> at
> org.apache.kafka.test.TestUtils.waitForCondition(TestUtils.java:361){quote}
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