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https://issues.apache.org/jira/browse/KAFKA-8745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16898438#comment-16898438
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ASF GitHub Bot commented on KAFKA-8745:
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wushujames commented on pull request #7152: KAFKA-8745: DumpLogSegments doesn't
show keys, when the message is null
URL: https://github.com/apache/kafka/pull/7152
Make sure to show the message key, even when the message value is null.
This changes the output of one of the tools. Is the output of the tool
considered a public API? Does this need a discussion or a KIP?
Testing: Ran the tool on a compacted topic. Previously, the tool did not
show any message keys for tombstone messages (messages where the value is
null). Now, the tool shows message keys.
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> DumpLogSegments doesn't show keys, when the message is null
> -----------------------------------------------------------
>
> Key: KAFKA-8745
> URL: https://issues.apache.org/jira/browse/KAFKA-8745
> Project: Kafka
> Issue Type: Improvement
> Components: tools
> Affects Versions: 2.3.0
> Reporter: James Cheng
> Assignee: James Cheng
> Priority: Major
>
> When DumpLogSegments encounters a message with a message key, but no message
> value, it doesn't print out the message key.
>
> {noformat}
> $ ~/kafka_2.11-2.2.0/bin/kafka-run-class.sh kafka.tools.DumpLogSegments
> --files compacted-0/00000000000000000000.log --print-data-log
> Dumping compacted-0/00000000000000000000.log
> Starting offset: 0
> baseOffset: 0 lastOffset: 3 count: 4 baseSequence: -1 lastSequence: -1
> producerId: -1 producerEpoch: -1 partitionLeaderEpoch: 0 isTransactional:
> false isControl: false position: 0 CreateTime: 1564696640073 size: 113 magic:
> 2 compresscodec: NONE crc: 206507478 isvalid: true
> | offset: 2 CreateTime: 1564696640073 keysize: 4 valuesize: -1 sequence: -1
> headerKeys: []
> | offset: 3 CreateTime: 1564696640073 keysize: 4 valuesize: -1 sequence: -1
> headerKeys: []
> {noformat}
> It should print out the message key.
>
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