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https://issues.apache.org/jira/browse/CASSANDRA-9086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeremy Hanna updated CASSANDRA-9086:
------------------------------------
    Labels: LWT  (was: )

> CAS precondition mismatch - row is still inserted
> -------------------------------------------------
>
>                 Key: CASSANDRA-9086
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9086
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra version 2.0.11
> 24 nodes in 4 datacenters (6 nodes per dc)
>            Reporter: Roger Schildmeijer
>            Assignee: Carl Yeksigian
>            Priority: Critical
>              Labels: LWT
>             Fix For: 2.0.15
>
>         Attachments: conditional_insert_failure_cleaned.txt
>
>
> Cassandra claims CAS precondition didn't match current values[1], but the row 
> is still inserted.
> We are having a quite simple cf schema:
> {code:xml}
> create table index (
>   u text PRIMARY KEY,
>   abc set<uuid>,
> ) WITH
>   compaction={'class': 'LeveledCompactionStrategy'};
> {code}
> CQL statement:
> {code:xml}
> INSERT INTO index(u, abc) VALUES(?, ?) IF NOT EXISTS
> {code}
> Sometimes, especially during some write load, Cassandra claims the 
> conditional insert wasn't satisfied ([applied] false), but the row is still 
> inserted.
> The response from the conditional insert contains [applied]=false + the data 
> we tried to insert.
> A full CQL trace is attached.
> [1] CAS precondition      CAS precondition 
> org.apache.cassandra.cql3.statements.CQL3CasConditions@1b2576ce does not 
> match current values ColumnFamily(username_index 
> -{deletedAt=-9223372036854775808, localDeletion=2147483647, 
> ranges=[abc-abc:!, deletedAt=1427889576525999, localDeletion=1427889564]}- 
> [:false:0@1427889576526000,abc:39f1a470ee694761a8197c0d0ada8e8f:false:0@1427889576526000,])
>  | 11:59:37.060 | /10.0.0.1 | 533702



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