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Review request for kafka. Bugs: KAFKA-2102 https://issues.apache.org/jira/browse/KAFKA-2102 Repository: kafka Description ------- Method does not need to be synchronized Do not synchronize contains topic method Continue removing the need to synchronize the metadata object Store both last refresh and need to refresh in same variable Fix synchronize issue Version needs to be volatile rework how signally happens remove unnecessary creation of new set initialize 0 at the field level Diffs ----- clients/src/main/java/org/apache/kafka/clients/Metadata.java 07f1cdb1fe920b0c7a5f2d101ddc40c689e1b247 clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java b91e2c52ed0acb1faa85915097d97bafa28c413a Diff: https://reviews.apache.org/r/32937/diff/ Testing ------- Thanks, Tim Brooks