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Review request for kafka. Bugs: KAFKA-1533 https://issues.apache.org/jira/browse/KAFKA-1533 Repository: kafka Description ------- 1. Add the metadataRefreshAttemptMS in NetworkClient for backing off; 2. Refactor Producer API tests using KafkaTestHarness; 3. Change default backoff time to 100ms for test utils Diffs ----- clients/src/main/java/org/apache/kafka/clients/NetworkClient.java d8f9ce663ee24d2b0852c974136741280c39f8f8 clients/src/main/java/org/apache/kafka/clients/producer/internals/Metadata.java 4aa5b01d611631db72df47d50bbe30edb8c478db core/src/test/scala/integration/kafka/api/ProducerFailureHandlingTest.scala 15fd5bcbaf175a0f7d7cf0b142e63f705ca9b6ae core/src/test/scala/integration/kafka/api/ProducerSendTest.scala 34a7db4b4ea2b720476c2b1f22a623a997faffbc core/src/test/scala/unit/kafka/integration/KafkaServerTestHarness.scala 194dd70919a5f301d3131c56594e40a0ebb27311 core/src/test/scala/unit/kafka/utils/TestUtils.scala 3faa884f8eb83c7c00baab416d0acfb488dc39c1 Diff: https://reviews.apache.org/r/23521/diff/ Testing ------- Thanks, Guozhang Wang