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https://issues.apache.org/jira/browse/KAFKA-5151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011385#comment-16011385
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Sriram Subramanian commented on KAFKA-5151:
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[~guozhang] can we close this?
> Refactor TransactionCoordinator in-memory structure and error handling logic
> ----------------------------------------------------------------------------
>
> Key: KAFKA-5151
> URL: https://issues.apache.org/jira/browse/KAFKA-5151
> Project: Kafka
> Issue Type: Sub-task
> Components: core
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
>
> Current status:
> 1. we are having two types of threads: request handling thread for any client
> requests as well as controller requests for `immigration` and `emigration`,
> and the marker sender thread for draining queued marker entries and handle
> responses. They maintain different in-memory cache structures like the
> `txnMetadataCache`, and the `pendingTxnMap` which are storing the same info,
> and they access some of the shared structures concurrently, like the markers
> queue and the markerPurgatory.
> 2. we are having one queue per broker today, and due to the emigration
> purpose we probably are having one queue per brokerId + TxnLogPartitionId +
> DataPartitionId, which would result in a lot of queues to handle.
> This ticket is for collapsing some of these structures and simplify the
> access of them from concurrent threads.
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