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https://issues.apache.org/jira/browse/CASSANDRA-13086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794695#comment-15794695
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Alex Petrov commented on CASSANDRA-13086:
-----------------------------------------
bq. I did some debugging recently and was able to track these ResultSets to
StorageProxy.cas() to the "CAS precondition does not match current values {}"
return statement.
This is just where the code exists when the results were not applied, a trace
statement to help debugging issues C*-side.
I know we have several cases when the value is not returned. One of the
examples would be when there's no row that would match the request (although
with special conditions, you can refer to {{InsertUpdateIfConditionTest}} for
more information, check for the tests with empty partitions).
Could you paste example schema and example succeeding/failing CAS statements
with full results and explain why you expect the row to be returned in a
certain case?
Thank you!
> CAS resultset sometimes does not contain value column even though wasApplied
> is false
> -------------------------------------------------------------------------------------
>
> Key: CASSANDRA-13086
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13086
> Project: Cassandra
> Issue Type: Bug
> Reporter: Christian Spriegel
> Assignee: Alex Petrov
> Priority: Minor
>
> Every now and then I see a ResultSet for one of my CAS queries that contain
> wasApplied=false, but does not contain my value column.
> I just now found another occurrence, which causes the following exception in
> the driver:
> {code}
> ...
> Caused by: com.mycompany.MyDataaccessException: checkLock(ResultSet[
> exhausted: true, Columns[[applied](boolean)]])
> at com.mycompany.MyDAO._checkLock(MyDAO.java:408)
> at com.mycompany.MyDAO._releaseLock(MyDAO.java:314)
> ... 16 more
> Caused by: java.lang.IllegalArgumentException: value is not a column defined
> in this metadata
> at
> com.datastax.driver.core.ColumnDefinitions.getAllIdx(ColumnDefinitions.java:266)
> at
> com.datastax.driver.core.ColumnDefinitions.getFirstIdx(ColumnDefinitions.java:272)
> at
> com.datastax.driver.core.ArrayBackedRow.getIndexOf(ArrayBackedRow.java:81)
> at
> com.datastax.driver.core.AbstractGettableData.getBytes(AbstractGettableData.java:151)
> at com.mycompany.MyDAO._checkLock(MyDAO.java:383)
> ... 17 more
> {code}
> The query the application was doing:
> delete from "Lock" where lockname=:lockname and id=:id if value=:value;
> I did some debugging recently and was able to track these ResultSets to
> StorageProxy.cas() to the "CAS precondition does not match current values {}"
> return statement.
> I saw this happening with Cassandra 3.0.10 and earlier versions.
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