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https://issues.apache.org/jira/browse/KAFKA-1339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Frank Varnavas updated KAFKA-1339:
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Affects Version/s: (was: 0.8.1)
0.8.0
> Time based offset retrieval seems broken
> ----------------------------------------
>
> Key: KAFKA-1339
> URL: https://issues.apache.org/jira/browse/KAFKA-1339
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.0
> Environment: Linux
> Reporter: Frank Varnavas
> Priority: Minor
>
> The kafka PartitionOffsetRequest takes a time parameter. It seems broken to
> me.
> There are two magic values
> -2 returns the oldest available offset
> -1 returns the newest available offset
> Otherwise the value is time since epoch in millisecs
> (System.currentTimeMillis())
> The granularity is limited to the granularity of the log files
> These are the log segments for the partition I tested
> Time now is about 17:07
> Time shown is last modify time
> File name has the starting offset number
> You can see that the current one started about 13:40
> 1073742047 Mar 24 02:52 00000000000004740823.log
> 1073759588 Mar 24 11:25 00000000000004831581.log
> 1073782532 Mar 24 16:31 00000000000004916313.log
> 1073741985 Mar 25 09:11 00000000000005066939.log
> 1073743756 Mar 25 13:39 00000000000005158529.log
> 778424349 Mar 25 17:07 00000000000005214225.log
> The below shows the returned offset for an input time = (current time -
> [0..23] hours)
> Even 1 second less than the current time returns the previous segment, even
> though that segment ended 2.5 hours earlier.
> I think the result is off by 1 log segment. i.e. offset 1-3 should have been
> from 5214225, 4-7 should have been from 5158529
> 0 -> 5214225
> 1 -> 5158529
> 2 -> 5158529
> 3 -> 5158529
> 4 -> 5066939
> 5 -> 5066939
> 6 -> 5066939
> 7 -> 5066939
> 8 -> 4973490
> 9 -> 4973490
> 10 -> 4973490
> 11 -> 4973490
> 12 -> 4973490
> 13 -> 4973490
> 14 -> 4973490
> 15 -> 4973490
> 16 -> 4916313
> 17 -> 4916313
> 18 -> 4916313
> 19 -> 4916313
> 20 -> 4916313
> 21 -> 4916313
> 22 -> 4916313
> 23 -> 4916313
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