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Omnia Ibrahim resolved KAFKA-14616. ----------------------------------- Fix Version/s: 3.7.0 Assignee: Colin McCabe Resolution: Fixed > Topic recreation with offline broker causes permanent URPs > ---------------------------------------------------------- > > Key: KAFKA-14616 > URL: https://issues.apache.org/jira/browse/KAFKA-14616 > Project: Kafka > Issue Type: Bug > Components: kraft > Affects Versions: 3.3.1 > Reporter: Omnia Ibrahim > Assignee: Colin McCabe > Priority: Major > Fix For: 3.7.0 > > > We are facing an odd situation when we delete and recreate a topic while > broker is offline in KRAFT mode. > Here’s what we saw step by step > # Created topic {{foo.test}} with 10 partitions and 4 replicas — Topic > {{foo.test}} was created with topic ID {{MfuZbwdmSMaiSa0g6__TPg}} > # Took broker 4 offline — which held replicas for partitions {{0, 3, 4, 5, > 7, 8, 9}} > # Deleted topic {{foo.test}} — The deletion process was successful, despite > the fact that broker 4 still held replicas for partitions {{0, 3, 4, 5, 7, 8, > 9}} on local disk. > # Recreated topic {{foo.test}} with 10 partitions and 4 replicas. — Topic > {{foo.test}} was created with topic ID {{RzalpqQ9Q7ub2M2afHxY4Q}} and > partitions {{0, 1, 2, 7, 8, 9}} got assigned to broker 4 (which was still > offline). Notice here that partitions {{0, 7, 8, 9}} are common between the > assignment of the deleted topic ({{{}topic_id: MfuZbwdmSMaiSa0g6__TPg{}}}) > and the recreated topic ({{{}topic_id: RzalpqQ9Q7ub2M2afHxY4Q{}}}). > # Brough broker 4 back online. > # Broker started to create new partition replicas for the recreated topic > {{foo.test}} ({{{}topic_id: RzalpqQ9Q7ub2M2afHxY4Q{}}}) > # The broker hit the following error {{Tried to assign topic ID > RzalpqQ9Q7ub2M2afHxY4Q to log for topic partition foo.test-9,but log already > contained topic ID MfuZbwdmSMaiSa0g6__TPg}} . As a result of this error the > broker decided to rename log dir for partitions {{0, 3, 4, 5, 7, 8, 9}} to > {{{}<topic>-<partition>.<uuid>-delete{}}}. > # Ran {{ls <log.dir_path>}} > {code:java} > foo.test-0.658f87fb9a2e42a590b5d7dcc28862b5-delete/ > foo.test-1/ > foo.test-2/ > foo.test-3.a68f05d05bcc4e579087551b539af311-delete/ > foo.test-4.79ce30a5310d4950ad1b28f226f74895-delete/ > foo.test-5.76ed04da75bf46c3a63342be1eb44450-delete/ > foo.test-6/ > foo.test-7.c2d33db3bf844e9ebbcd9ef22f5270da-delete/ > foo.test-8.33836969ac714b41b69b5334a5068ce0-delete/ > foo.test-9.48e1494f4fac48c8aec009bf77d5e4ee-delete/{code} > 9. Waited until the deletion of the old topic was done and ran {{ls > <log.dir_path>}} again, now we were expecting to see log dir for partitions > {{0, 1, 2, 7, 8, 9}} however the result is: > {code:java} > foo.test-1/ > foo.test-2/ > foo.test-6/{code} > 10. Ran {{kafka-topics.sh --command-config cmd.properties > --bootstrap-server <bootstrap> --describe --topic foo.test}} > {code:java} > Topic: foo.test TopicId: RzalpqQ9Q7ub2M2afHxY4Q PartitionCount: 10 > ReplicationFactor: 4 Configs: > min.insync.replicas=2,segment.bytes=1073741824,max.message.bytes=3145728,unclean.leader.election.enable=false,retention.bytes=1000000000 > Topic: foo.test Partition: 0 Leader: 2 Replicas: 2,3,4,5 Isr: 2,3,5 > Topic: foo.test Partition: 1 Leader: 3 Replicas: 3,4,5,6 Isr: 3,5,6,4 > Topic: foo.test Partition: 2 Leader: 5 Replicas: 5,4,6,1 Isr: 5,6,1,4 > Topic: foo.test Partition: 3 Leader: 5 Replicas: 5,6,1,2 Isr: 5,6,1,2 > Topic: foo.test Partition: 4 Leader: 6 Replicas: 6,1,2,3 Isr: 6,1,2,3 > Topic: foo.test Partition: 5 Leader: 1 Replicas: 1,6,2,5 Isr: 1,6,2,5 > Topic: foo.test Partition: 6 Leader: 6 Replicas: 6,2,5,4 Isr: 6,2,5,4 > Topic: foo.test Partition: 7 Leader: 2 Replicas: 2,5,4,3 Isr: 2,5,3 > Topic: foo.test Partition: 8 Leader: 5 Replicas: 5,4,3,1 Isr: 5,3,1 > Topic: foo.test Partition: 9 Leader: 3 Replicas: 3,4,1,6 Isr: 3,1,6{code} > Here’s a sample of broker logs > > {code:java} > {"timestamp":"2023-01-11T15:19:53,620Z","level":"INFO","thread":"kafka-scheduler-8","message":"Deleted > log for partition foo.test-9 in > /kafka/d1/data/foo.test-9.48e1494f4fac48c8aec009bf77d5e4ee-delete.","logger":"kafka.log.LogManager"} > {"timestamp":"2023-01-11T15:19:53,617Z","level":"INFO","thread":"kafka-scheduler-8","message":"Deleted > time index > /kafka/d1/data/foo.test-9.48e1494f4fac48c8aec009bf77d5e4ee-delete/00000000000000000000.timeindex.deleted.","logger":"kafka.log.LogSegment"} > {"timestamp":"2023-01-11T15:19:53,617Z","level":"INFO","thread":"kafka-scheduler-8","message":"Deleted > offset index > /kafka/d1/data/foo.test-9.48e1494f4fac48c8aec009bf77d5e4ee-delete/00000000000000000000.index.deleted.","logger":"kafka.log.LogSegment"} > {"timestamp":"2023-01-11T15:19:53,615Z","level":"INFO","thread":"kafka-scheduler-8","message":"Deleted > log > /kafka/d1/data/foo.test-9.48e1494f4fac48c8aec009bf77d5e4ee-delete/00000000000000000000.log.deleted.","logger":"kafka.log.LogSegment"} > {"timestamp":"2023-01-11T15:19:53,614Z","level":"INFO","thread":"kafka-scheduler-8","message":"[LocalLog > partition=foo.test-9, dir=/kafka/d1/data] Deleting segment files > LogSegment(baseOffset=0, size=0, lastModifiedTime=1673439574661, > largestRecordTimestamp=None)","logger":"kafka.log.LocalLog$"} > {"timestamp":"2023-01-11T15:19:53,612Z","level":"INFO","thread":"kafka-scheduler-8","message":"[LocalLog > partition=foo.test-9, dir=/kafka/d1/data] Deleting segments as the log has > been deleted: LogSegment(baseOffset=0, size=0, > lastModifiedTime=1673439574661, > largestRecordTimestamp=None)","logger":"kafka.log.LocalLog"} > {"timestamp":"2023-01-11T15:18:53,611Z","level":"INFO","thread":"EventHandler","message":"Log > for partition foo.test-9 is renamed to > /kafka/d1/data/foo.test-9.48e1494f4fac48c8aec009bf77d5e4ee-delete and is > scheduled for deletion","logger":"kafka.log.LogManager"} > {"timestamp":"2023-01-11T15:18:53,596Z","level":"INFO","thread":"EventHandler","message":"Found > stray log dir Log(dir=/kafka/d1/data/foo.test-4, > topicId=MfuZbwdmSMaiSa0g6__TPg, topic=foo.test, partition=4, highWatermark=0, > lastStableOffset=0, logStartOffset=0, logEndOffset=0): the topicId > MfuZbwdmSMaiSa0g6__TPg does not exist in the metadata > image","logger":"kafka.server.metadata.BrokerMetadataPublisher$"} > {"timestamp":"2023-01-11T15:18:51,578Z","level":"ERROR","thread":"EventHandler","message":"[Broker > id=4] Unable to start fetching foo.test-9 with topic ID > RzalpqQ9Q7ub2M2afHxY4Q due to > InconsistentTopicIdException","logger":"state.change.logger","throwable":{"class":"org.apache.kafka.common.errors.InconsistentTopicIdException","msg":"Tried > to assign topic ID RzalpqQ9Q7ub2M2afHxY4Q to log for topic partition > foo.test-9,but log already contained topic ID MfuZbwdmSMaiSa0g6__TPg"}} > {"timestamp":"2023-01-11T15:18:51,577Z","level":"INFO","thread":"EventHandler","message":"[Broker > id=4] Creating new partition foo.test-9 with topic id > RzalpqQ9Q7ub2M2afHxY4Q.","logger":"state.change.logger"} > {"timestamp":"2023-01-11T15:18:51,465Z","level":"INFO","thread":"log-recovery-/kafka/d1/data-0","message":"Completed > load of Log(dir=/kafka/d1/data/foo.test-9, topicId=MfuZbwdmSMaiSa0g6__TPg, > topic=foo.test, partition=9, highWatermark=0, lastStableOffset=0, > logStartOffset=0, logEndOffset=0) with 1 segments in 4ms (41/46 completed in > /kafka/d1/data)","logger":"kafka.log.LogManager"} > {"timestamp":"2023-01-11T15:18:51,464Z","level":"INFO","thread":"log-recovery-/kafka/d1/data-0","message":"[LogLoader > partition=foo.test-9, dir=/kafka/d1/data] Loading producer state till offset > 0 with message format version 2","logger":"kafka.log.UnifiedLog$"} > > {code} > So what we noticed here is that KRaft didn’t recreate the log dir for > partitions {{0, 7, 8, 9}} for the recreated topic after it deleted them for > the deleted topic. > There're few behaviours here that are different than ZK mode (to the extent > of our knowledge): > # In ZK mode deleting a topic is a blocking step for recreating the topic, > so in our case in ZK mode, the deletion of {{foo.test}} will be waiting for > broker 4 to recover first, complete the deletion then a user can recreate the > topic. (KIP-516 proposed changing the log.dir layout from > <{_}{{topic><partition>}} format to > `{{{}topicIdprefix{}}}/<topicId><{_}partition>` but this has not been done > yet".). While KRaft is fire and forget. > # In ZK mode, creating a new topic doesn't assign partitions to non-active > brokers. In the scenario we faced, the behavior of KRaft seems to be > different. KRaft assigned partitions to broker 4 while broker 4 was down. -- This message was sent by Atlassian Jira (v8.20.10#820010)