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From "Aleksey Yeschenko (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-13880) Fix short read protection for tables with no clustering columns
Date Tue, 19 Sep 2017 10:22:00 GMT


Aleksey Yeschenko updated CASSANDRA-13880:
       Resolution: Fixed
    Fix Version/s:     (was: 3.11.x)
                       (was: 3.0.x)
           Status: Resolved  (was: Patch Available)

> Fix short read protection for tables with no clustering columns
> ---------------------------------------------------------------
>                 Key: CASSANDRA-13880
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Coordination
>            Reporter: Aleksey Yeschenko
>            Assignee: Aleksey Yeschenko
>             Fix For: 3.0.15, 3.11.1
> CASSANDRA-12872 fixed counting replica rows, so that we do now fetch more than one extra
row if necessary.
> Fixing the issue caused to start failing,
by exposing a bug in the way we handle empty clusterings.
> When {{moreContents()}} asks for another row and {{lastClustering}} is {{EMPTY}}, the
response again (and again) contains the row with {{EMPTY}} clustering.
> SRP assumes it’s a new row, counts it as one, gets confused and keeps asking for more,
in a loop, again and again.
> Arguably, a response to a read command with the following non-inclusive {{ClusteringIndexFilter}}:
> {code}
> command.clusteringIndexFilter(partitionKey).forPaging(metadata.comparator, Clustering.EMPTY,
> {code}
> ... should return nothing at all rather than a row with an empty clustering.
> Also arguably, SRP should not even attempt to fetch more rows if {{lastClustering ==
Clustering.EMPTY}}. In a partition key only column
> we shouldn’t expect any more rows.
> This JIRA is to fix the latter issue on SRP side - to modify SRP logic to short-circuit
execution if {{lastClustering}} was an {{EMPTY}} one instead of querying pointlessly for non-existent
extra rows.

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