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https://issues.apache.org/jira/browse/CASSANDRA-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667363#comment-13667363
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Michael Theroux edited comment on CASSANDRA-4905 at 5/26/13 6:01 PM:
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The long compactions before the fix I think is a byproduct of leveled
compaction. I've seen a number of people mention this on the users list.
Basically, leveled compaction in 1.1 is a single threaded process, and
increasing the compaction throughput doesn't help its rate. Leveled compaction
is very slow to compact.
Leveled compaction should be better than Size Tiered, unless you are doing
something like major compactions (we are on some tables).
CASSANDRA-5398 looks interesting. We rolled this fix + 1.1.11 into production
this weekend. The last repair was a thing of beauty... finished in under 3
hours, very little streaming and compaction... as it should be if you have
don't have any, or very few inconsistencies in your data. Given its running so
well, I'll leave well-enough alone and not apply 5398.
was (Author: mtheroux2):
The long compactions before the fix I think is a byproduct of leveled
compaction. I've seen a number of people mention this on the users list.
Basically, leveled compaction in 1.1 is a single threaded process, and
increasing the compaction throughput doesn't help its rate. Leveled compaction
is very slow to compact.
Leveled compaction should be better than Size Tiered, unless you are doing
something like major compactions (we are on some tables).
CASSANDRA-5398 looks interesting. We rolled this fix + 1.1.11 into production
this weekend. The last repair was a thing of beauty... finished in under 3
hours, very little streaming and compaction... as it should be if you have
don't have any, or very few inconsistencies in your data.
> Repair should exclude gcable tombstones from merkle-tree computation
> --------------------------------------------------------------------
>
> Key: CASSANDRA-4905
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4905
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Christian Spriegel
> Assignee: Sylvain Lebresne
> Fix For: 1.2.0 beta 3
>
> Attachments: 4905.txt
>
>
> Currently gcable tombstones get repaired if some replicas compacted already,
> but some are not compacted.
> This could be avoided by ignoring all gcable tombstones during merkle tree
> calculation.
> This was discussed with Sylvain on the mailing list:
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/repair-compaction-and-tombstone-rows-td7583481.html
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