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https://issues.apache.org/jira/browse/KAFKA-1987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14341226#comment-14341226
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Neha Narkhede commented on KAFKA-1987:
--------------------------------------
+1
> Potential race condition in partition creation
> ----------------------------------------------
>
> Key: KAFKA-1987
> URL: https://issues.apache.org/jira/browse/KAFKA-1987
> Project: Kafka
> Issue Type: Bug
> Components: controller
> Affects Versions: 0.8.1.1
> Reporter: Todd Palino
> Assignee: Neha Narkhede
>
> I am finding that there appears to be a race condition when creating
> partitions, with replication factor 2 or higher, between the creation of the
> partition on the leader and the follower. What appears to be happening is
> that the follower is processing the command to create the partition before
> the leader does, and when the follower starts the replica fetcher, it fails
> with an UnknownTopicOrPartitionException.
> The situation is that I am creating a large number of partitions on a
> cluster, preparing it for data being mirrored from another cluster. So there
> are a sizeable number of create and alter commands being sent sequentially.
> Eventually, the replica fetchers start up properly. But it seems like the
> controller should issue the command to create the partition to the leader,
> wait for confirmation, and then issue the command to create the partition to
> the followers.
> 2015/02/26 21:11:50.413 INFO [LogManager] [kafka-request-handler-12]
> [kafka-server] [] Created log for partition [topicA,30] in
> /path_to/i001_caches with properties {segment.index.bytes -> 10485760,
> file.delete.delay.ms -> 60000, segment.bytes -> 268435456, flush.ms -> 10000,
> delete.retention.ms -> 86400000, index.interval.bytes -> 4096,
> retention.bytes -> -1, min.insync.replicas -> 1, cleanup.policy -> delete,
> unclean.leader.election.enable -> true, segment.ms -> 43200000,
> max.message.bytes -> 1000000, flush.messages -> 20000,
> min.cleanable.dirty.ratio -> 0.5, retention.ms -> 86400000, segment.jitter.ms
> -> 0}.
> 2015/02/26 21:11:50.418 WARN [Partition] [kafka-request-handler-12]
> [kafka-server] [] Partition [topicA,30] on broker 1551: No checkpointed
> highwatermark is found for partition [topicA,30]
> 2015/02/26 21:11:50.418 INFO [ReplicaFetcherManager]
> [kafka-request-handler-12] [kafka-server] [] [ReplicaFetcherManager on broker
> 1551] Removed fetcher for partitions [topicA,30]
> 2015/02/26 21:11:50.418 INFO [Log] [kafka-request-handler-12] [kafka-server]
> [] Truncating log topicA-30 to offset 0.
> 2015/02/26 21:11:50.450 INFO [ReplicaFetcherManager]
> [kafka-request-handler-12] [kafka-server] [] [ReplicaFetcherManager on broker
> 1551] Added fetcher for partitions List([[topicA,30], initOffset 0 to broker
> id:1555,host:host1555.example.com,port:10251] )
> 2015/02/26 21:11:50.615 ERROR [ReplicaFetcherThread]
> [ReplicaFetcherThread-0-1555] [kafka-server] []
> [ReplicaFetcherThread-0-1555], Error for partition [topicA,30] to broker
> 1555:class kafka.common.UnknownTopicOrPartitionException
> 2015/02/26 21:11:50.616 ERROR [ReplicaFetcherThread]
> [ReplicaFetcherThread-0-1555] [kafka-server] []
> [ReplicaFetcherThread-0-1555], Error for partition [topicA,30] to broker
> 1555:class kafka.common.UnknownTopicOrPartitionException
> 2015/02/26 21:11:50.618 ERROR [ReplicaFetcherThread]
> [ReplicaFetcherThread-0-1555] [kafka-server] []
> [ReplicaFetcherThread-0-1555], Error for partition [topicA,30] to broker
> 1555:class kafka.common.UnknownTopicOrPartitionException
> 2015/02/26 21:11:50.620 ERROR [ReplicaFetcherThread]
> [ReplicaFetcherThread-0-1555] [kafka-server] []
> [ReplicaFetcherThread-0-1555], Error for partition [topicA,30] to broker
> 1555:class kafka.common.UnknownTopicOrPartitionException
> 2015/02/26 21:11:50.621 ERROR [ReplicaFetcherThread]
> [ReplicaFetcherThread-0-1555] [kafka-server] []
> [ReplicaFetcherThread-0-1555], Error for partition [topicA,30] to broker
> 1555:class kafka.common.UnknownTopicOrPartitionException
> 2
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