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https://issues.apache.org/jira/browse/CASSANDRA-1546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918606#action_12918606
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Kelvin Kakugawa edited comment on CASSANDRA-1546 at 10/6/10 1:43 PM:
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I read through your note on the v3 marker strategy. It sounds reasonable and
does address the concerns that I raised, earlier.
I think it's worth it for you to highlight the potential drawbacks. The three
that seem to stick out the most are:
1) it requires 1-2 reads in a synchronized code path, which doesn't gel w/
cassandra's write-optimized design,
2) over-counts are repaired in an eventually consistent manner, and
3) UUIDs are only maintained for a configurable TTL.
The above aren't showstoppers. However, anyone interested in using UUIDs to
track updates should be aware of their limitations + trade-offs.
was (Author: kelvin):
I read through your note on the v3 marker strategy. It sounds reasonable
and does address the concerns that I raised, earlier.
I think it's worth it for you to highlight the potential drawbacks. The three
that seem to stick out the most are:
1) it requires 1-2 reads in a synchronized method, which doesn't gel w/
cassandra's write-optimized design,
2) over-counts are repaired in an eventually consistent manner, and
3) UUIDs are only maintained for a configurable TTL.
The above aren't showstoppers. However, anyone interested in using UUIDs to
track updates should be aware of their limitations + trade-offs.
> (Yet another) approach to counting
> ----------------------------------
>
> Key: CASSANDRA-1546
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1546
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 0.7.0
>
> Attachments: 0001-Remove-IClock-from-internals.patch,
> 0001-v2-Remove-IClock-from-internals.patch,
> 0001-v3-Remove-IClock-from-internals.txt, 0002-Counters.patch,
> 0002-v2-Counters.patch, 0002-v3-Counters.txt,
> 0003-Generated-thrift-files-changes.patch, 0003-v2-Thrift-changes.patch,
> 0003-v3-Thrift-changes.txt, marker_idea.txt
>
>
> This could be described as a mix between CASSANDRA-1072 without clocks and
> CASSANDRA-1421.
> More details in the comment below.
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