[jira] [Updated] (CASSANDRA-14766) DESC order reads can fail to return the last Unfiltered in the partition in a legacy sstable

["C. Scott Andreas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-14766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

C. Scott Andreas updated CASSANDRA-14766:
-----------------------------------------
         Severity: Critical  (was: Normal)
       Complexity: Challenging
    Discovered By: Fuzz Test
     Bug Category: Parent values: Correctness(12982)Level 1 values: Response Corruption / Loss(12987)
    Since Version: 3.0.0

> DESC order reads can fail to return the last Unfiltered in the partition in a legacy sstable
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14766
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14766
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/SSTable
>            Reporter: Aleksey Yeschenko
>            Assignee: Aleksey Yeschenko
>            Priority: Urgent
>             Fix For: 3.0.18, 3.11.4
>
>
> {{OldFormatDeserializer}}’s {{hasNext()}} method can and will consume two {{Unfiltered}} from the underlying iterator in some scenarios - intentionally.
> But in doing that it’s losing intermediate state of {{lastConsumedPosition}}. If that last block, when iterating backwards, only has two {{Unfiltered}}, the first one will be returned, and the last one won’t as the reverse iterator would incorrectly things that the deserisalizer is past the index block, despite still having one {{Unfiltered}} unreturned.



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