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https://issues.apache.org/jira/browse/CASSANDRA-19920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Blake Eggleston updated CASSANDRA-19920:
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Bug Category: Parent values: Degradation(12984)
Complexity: Normal
Component/s: Accord
Discovered By: Performance Regression Test
Reviewers: David Capwell
Severity: Normal
Assignee: Blake Eggleston
Status: Open (was: Triage Needed)
> CEP-15 (C*): Read accord repair cfk keys from sstable index.
> ------------------------------------------------------------
>
> Key: CASSANDRA-19920
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19920
> Project: Cassandra
> Issue Type: Bug
> Components: Accord
> Reporter: Blake Eggleston
> Assignee: Blake Eggleston
> Priority: Normal
>
> In clusters where accord repairs are dealing with a lot of keys, reading the
> keys via cql can take up to 90% of cpu time. This patch switches to reading
> cfk keys out of the sstable index, which effectively removes that step of
> accord repair from the profiler output. Given the structure of the CFK table
> and how C* reads compound partition keys with local partitioner, this is a
> little involved since we need to properly handle exclusive starts and
> inclusive ends without a full partition key.
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