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From "Christian Spriegel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13086) CAS resultset sometimes does not contain value column even though wasApplied is false
Date Fri, 30 Dec 2016 09:34:58 GMT
Christian Spriegel created CASSANDRA-13086:
----------------------------------------------

             Summary: 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
            Priority: Minor


Every now and then I see a ResultSet for one of my CAS queries that say 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. 



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