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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1546) (Yet another) approach to counting
Date Thu, 21 Oct 2010 09:00:18 GMT


Sylvain Lebresne commented on CASSANDRA-1546:

I'm not sure I fully understand your scenario. But thinking about it more too, I retract the
fact that we should force regenerating the node id during bootstrap.
If you decommission a node and boostrap it back, then as long you haven't done one of 1) deleting
its sstable and not its system tables or 2) deleting its system tables (at least some of them)
and not its sstables, then you are fine. You are fine because when bootstrapping the node
back it'll reuse it's old node id saved in the system table.

I'm not sure yet what is the best way to prevent 1) or 2), but I'm pretty sure the answer
doesn't lie in qualifying streaming operations. My opinion is that it's probably fine to as
people to not do 1) or 2), at least for starter. Maybe could we try to detect those case at
startup (even though I'm not sure how to detect 1), but that's a fairly weird situation anyway)
and refuse to start. In any case, I'm hopeful we can improve that later. 

Now maybe I haven't understand your point or I'm missing something, but I don't see problem
with the scenario you've described above.

> (Yet another) approach to counting
> ----------------------------------
>                 Key: CASSANDRA-1546
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>             Fix For: 0.7.1
>         Attachments: 0001-v2-Remove-IClock-from-internals.patch, 0001-v3-Remove-IClock-from-internals.txt,
0001-v4-Counters.patch, 0002-v2-Counters.patch, 0002-v3-Counters.txt, 0002-v4-thrift-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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