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https://issues.apache.org/jira/browse/KAFKA-10501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360662#comment-17360662
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Victor Garcia commented on KAFKA-10501:
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As per this response
https://issues.apache.org/jira/browse/KAFKA-8335?focusedCommentId=17360656&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17360656
It seems the issue gets fixed in 2.5.1
> Log Cleaner never clean up some __consumer_offsets partitions
> -------------------------------------------------------------
>
> Key: KAFKA-10501
> URL: https://issues.apache.org/jira/browse/KAFKA-10501
> Project: Kafka
> Issue Type: Bug
> Components: log, log cleaner
> Affects Versions: 2.5.0
> Reporter: Mykhailo Baluta
> Priority: Major
>
> Some __consumer_offsets partitions contain "broken" messages in the second
> log segment.
> Example:
> {code:java}
> offset: 745253728 position: 49793647 CreateTime: 1594539245536 isvalid: true
> keysize: 99 valuesize: 28 magic: 2 compresscodec: NONE producerId: 37146
> producerEpoch: 0 sequence: 0 isTransactional: true headerKeys: []
> offset: 745253729 position: 49793844 CreateTime: 1594539245548 isvalid: true
> keysize: 4 valuesize: 6 magic: 2 compresscodec: NONE producerId: 37146
> producerEpoch: 0 sequence: -1 isTransactional: true headerKeys: []
> endTxnMarker: COMMIT coordinatorEpoch: 59
> offset: 745256523 position: 50070884 CreateTime: 1594540927673 isvalid: true
> keysize: 4 valuesize: 6 magic: 2 compresscodec: NONE producerId: 37146
> producerEpoch: 1 sequence: -1 isTransactional: true headerKeys: []
> endTxnMarker: ABORT coordinatorEpoch: 59
> offset: 745256543 position: 50073185 CreateTime: 1594541667798 isvalid: true
> keysize: 99 valuesize: 28 magic: 2 compresscodec: NONE producerId: 37146
> producerEpoch: 0 sequence: 0 isTransactional: true headerKeys: []
> {code}
> Seems like the last 2 records are stored in the wrong order. As a result the
> last message is transactional and not any ABORT/COMMIT message after. It
> leads to a producer state with ongoing transactions and
> firstUncleanableDirtyOffset = 745256543. Thus, compaction always skips for
> such topic partitions.
>
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