Omnia Ibrahim created KAFKA-14616:
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Summary: 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
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}
# 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}
# 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.
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