ijuma commented on pull request #10415:
URL: https://github.com/apache/kafka/pull/10415#issuecomment-808230478


   @rajinisivaram we have one test failure (`testUnsupportedTlsVersion`) in the 
clients module with JDK 16:
   
   > Failed authentication with localhost/127.0.0.1 (SSL handshake failed) 
(org.apache.kafka.common.network.Selector:616)
   > [2021-03-26 06:37:05,312] ERROR Connection with /127.0.0.1 disconnected 
(org.apache.kafka.common.network.Selector:606)
   > java.io.EOFException: EOF during handshake, handshake status is NEED_UNWRAP
   >    at 
org.apache.kafka.common.network.SslTransportLayer.handshakeUnwrap(SslTransportLayer.java:525)
   >    at 
org.apache.kafka.common.network.SslTransportLayer.doHandshake(SslTransportLayer.java:368)
   >    at 
org.apache.kafka.common.network.SslTransportLayer.handshake(SslTransportLayer.java:291)
   >    at 
org.apache.kafka.common.network.KafkaChannel.prepare(KafkaChannel.java:178)
   >    at 
org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:543)
   >    at org.apache.kafka.common.network.Selector.poll(Selector.java:481)
   >    at 
org.apache.kafka.common.network.NioEchoServer.run(NioEchoServer.java:211)
   > 
   > org.opentest4j.AssertionFailedError: Condition not met within timeout 
15000. Metric not updated failed-authentication-total expected:<1.0> but 
was:<0.0> ==> 
   > Expected :true
   > Actual   :false
   >    at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
   >    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:40)
   >    at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:193)
   >    at 
org.apache.kafka.test.TestUtils.lambda$waitForCondition$3(TestUtils.java:303)
   >    at 
org.apache.kafka.test.TestUtils.retryOnExceptionWithTimeout(TestUtils.java:351)
   >    at 
org.apache.kafka.test.TestUtils.retryOnExceptionWithTimeout(TestUtils.java:319)
   >    at org.apache.kafka.test.TestUtils.waitForCondition(TestUtils.java:300)
   >    at 
org.apache.kafka.common.network.NioEchoServer.waitForMetrics(NioEchoServer.java:196)
   
   With JDK 15:
   
   > [2021-03-26 06:38:01,908] ERROR Failed authentication with /127.0.0.1 (SSL 
handshake failed) (org.apache.kafka.common.network.Selector:616)
   > [2021-03-26 06:38:01,908] ERROR Failed authentication with 
localhost/127.0.0.1 (SSL handshake failed) 
(org.apache.kafka.common.network.Selector:616)
   
   Any ideas?


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