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https://issues.apache.org/jira/browse/KAFKA-5238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247762#comment-16247762
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Edoardo Comar commented on KAFKA-5238:
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Hi [~ijuma] we may come up with a PR on this issue which is hitting us in a
slightly different scenario,
but with the same root cause :
topic being deleted just after creation, which means there is a follower first
fetch - delayed fetch request - still in the purgatory
while in your test case there is a delayed fetch because the consumer has
issued a prefetch.
our fix consists in checking in
{{ReplicaManager.readFromLocalLog}}
{{if(allPartitions.contains(tp))}}
and if not throw an UnknownTopicOrPartitionException
which will be checked in {{KafkaApi.fetchResponseCallback}} as a guard on
invoking {{brokerTopicStats.updateBytesOut}}
does this approach makes sense?
Hope so, in that case will make the PR on Monday
> BrokerTopicMetrics can be recreated after topic is deleted
> ----------------------------------------------------------
>
> Key: KAFKA-5238
> URL: https://issues.apache.org/jira/browse/KAFKA-5238
> Project: Kafka
> Issue Type: Bug
> Reporter: Ismael Juma
> Assignee: Edoardo Comar
>
> As part of KAFKA-3258, we added code to remove metrics during topic deletion.
> This works fine as long as there are no fetch requests in the purgatory. If
> there are, however, we'll recreate the metrics when we call
> `ReplicaManager.appendToLocalLog`.
> This can be reproduced by updating
> MetricsTest.testBrokerTopicMetricsUnregisteredAfterDeletingTopic() in the
> following way:
> {code}
> @Test
> def testBrokerTopicMetricsUnregisteredAfterDeletingTopic() {
> val topic = "test-broker-topic-metric"
> AdminUtils.createTopic(zkUtils, topic, 2, 1)
> // Produce a few messages and consume them to create the metrics
> TestUtils.produceMessages(servers, topic, nMessages)
> TestUtils.consumeTopicRecords(servers, topic, nMessages)
> assertTrue("Topic metrics don't exist", topicMetricGroups(topic).nonEmpty)
> assertNotNull(BrokerTopicStats.getBrokerTopicStats(topic))
> AdminUtils.deleteTopic(zkUtils, topic)
> TestUtils.verifyTopicDeletion(zkUtils, topic, 1, servers)
> Thread.sleep(10000)
> assertEquals("Topic metrics exists after deleteTopic", Set.empty,
> topicMetricGroups(topic))
> }
> {code}
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