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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13366) Possible AssertionError in UnfilteredRowIteratorWithLowerBound
Date Thu, 23 Mar 2017 09:33:41 GMT


Sylvain Lebresne commented on CASSANDRA-13366:

Committed thanks (I'm still keeping the "write a dtest" on my TODO list, but it may took me
a few days to get to it and I don't see the point delaying the commit given this is pretty
simple one).

bq. because it is unreliable in the presence of range tombstones and compact tables

Correct, it was unused and unsafe, so felt safer to just get rid of it.

> Possible AssertionError in UnfilteredRowIteratorWithLowerBound
> --------------------------------------------------------------
>                 Key: CASSANDRA-13366
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>             Fix For: 3.11.0
> In the code introduced by CASSANDRA-8180, we build a lower bound for a partition (sometimes)
based on the min clustering values of the stats file. We can't do that if the sstable has
and range tombston marker and the code does check that this is the case, but unfortunately
the check is done using the stats {{minLocalDeletionTime}} but that value isn't populated
properly in pre-3.0. This means that if you upgrade from 2.1/2.2 to 3.4+, you may end up getting
an exception like
> {noformat}
> WARN  [ReadStage-2] 2017-03-20 13:29:39,165
- Uncaught exception on thread Thread[ReadStage-2,5,main]: {}
> java.lang.AssertionError: Lower bound [INCL_START_BOUND(Foo, -9223372036854775808, -9223372036854775808)
]is bigger than first returned value [Marker INCL_START_BOUND(Foo)@1490013810540999] for sstable
>     at org.apache.cassandra.db.rows.UnfilteredRowIteratorWithLowerBound.computeNext(
> {noformat}
> and this until the sstable is upgraded.

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