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From "Tyler Hobbs (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-6778) FBUtilities.singleton() should use the CF comparator
Date Wed, 05 Mar 2014 19:00:46 GMT


Tyler Hobbs updated CASSANDRA-6778:

    Attachment: 6778-test.txt


The attached 6778-text.txt adds a unit test to exercise this patch.

As for 1.2, I agree that this is a pretty rare corner case, so it's probably safer to only
apply this patch to 2.0.

By the way, it looks like you already did most of this work on 2.1 as part of CASSANDRA-5417,
so make sure the conflicts get resolved properly.

> FBUtilities.singleton() should use the CF comparator
> ----------------------------------------------------
>                 Key: CASSANDRA-6778
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>             Fix For: 2.0.6
>         Attachments: 0001-Proper-comparison-for-singleton-sorted-set.txt, 0002-Use-comparator-instead-of-BB.equals.txt,
> We sometimes use FBUtilities.singleton() to created a SortedSet for NamesQueryFilter.
However, the set created by that method does not use the CF comparator, so that it use ByteBuffer
comparison/equality for methods like contains(). And this might not be ok if it turns that
the comparator is so that 2 column name can be equal without their binary representation being
equal, and as it turns out at least IntegerType, DecimalType (because they let you put arbitrary
many zeros in front of the binary encoding) have such property (BooleanType should also have
that property though it doesn't in practice which I think that's a bug, but that's for another
> I'll note that CASSANDRA-6733 contains an example where this matter.  However, in practice,
only SELECT on compact tables that select just one column can ever ran into that and you'd
only run into it if your client insert useless zeros in its IntegerType/DecimalType binary
representation, which ought to be not common in the first place. It's still wrong and should
be fixed.
> Patch attached to include the comparator in FBUtilities.singleton. I also found 2 other
small places where we were using ByteBuffer.equals() where the comparator should be used instead
and attaching a 2nd patch for those.

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