prateekm commented on a change in pull request #981: SAMZA-2152 : Bugfix: Making KafkaSytemAdmin's metadataConsumer accesses thread-safe, enabling StreamRegexMonitors only when required URL: https://github.com/apache/samza/pull/981#discussion_r271393999
########## File path: samza-kafka/src/main/java/org/apache/samza/system/kafka/KafkaSystemAdmin.java ########## @@ -231,11 +231,13 @@ public String getUpcomingOffset() { streamNames.forEach(streamName -> { Map<Partition, SystemStreamMetadata.SystemStreamPartitionMetadata> partitionMetadata = new HashMap<>(); - List<PartitionInfo> partitionInfos = metadataConsumer.partitionsFor(streamName); - LOG.debug("Stream {} has partitions {}", streamName, partitionInfos); - - partitionInfos.forEach(partitionInfo -> partitionMetadata.put(new Partition(partitionInfo.partition()), dummySspm)); + synchronized (metadataConsumer) { Review comment: Let's add a comment on the metadataConsumer field that all access needs to be synchronized (and explain why). Also, if possible let's make it private. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services