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https://issues.apache.org/jira/browse/CASSANDRA-15640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sam Tunnicliffe reassigned CASSANDRA-15640:
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Assignee: Sam Tunnicliffe
> digest may not match when single partition named queries skip older sstables
> ----------------------------------------------------------------------------
>
> Key: CASSANDRA-15640
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15640
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Local Write-Read Paths
> Reporter: ZhaoYang
> Assignee: Sam Tunnicliffe
> Priority: Normal
>
> Name queries (aka. single partition query with full clustering keys) query
> sstables sequentially in recency order, in the hope that most recent sstables
> will contain most recent data, so that they can avoid reading older sstables
> in {{SinglePartitionReadCommand#reduceFilter}}.
> Unfortunately, this optimization may cause digest mismatch if older sstables
> contain range tombstone or row deletion with lower timestamp. [Test
> Code|https://github.com/jasonstack/cassandra/commit/3dfa29bb34bc237ab2b68f849906c09569c5cc94]
> {code:java}
> Table with (pk, ck1, ck2)
> Node1:
> * delete row (pk=1, ck1=1) with ts=10
> * insert row (pk=1, ck1=1, ck2=1) with ts=11
> Node2:
> * delete row (pk=1, ck1=1) with ts=10
> * flush into sstable1
> * insert row (pk=1, ck1=1, ck2=1) with ts=11
> * flush into sstable2
> Query with pk=1 and ck1=1 and ck2=1
> * node1 returns: RT open marker, row, RT close marker
> * node2 returns: row (because sstable1 is skipped)
> Note: similar mismatch can happen with row deletion as well.
> {code}
> In the above example: Is it safe to ignore RT or row deletion if row liveness
> has higher timestamp for named queries in node1?
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