[
https://issues.apache.org/jira/browse/CASSANDRA-18987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Caleb Rackliffe updated CASSANDRA-18987:
----------------------------------------
Status: Ready to Commit (was: Review In Progress)
> Using counter column type in Accord transactions leads to Atomicity /
> Consistency violations
> --------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18987
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18987
> Project: Cassandra
> Issue Type: Bug
> Components: Accord
> Reporter: Luis E Fernandez
> Assignee: Caleb Rackliffe
> Priority: Normal
> Fix For: NA
>
> Attachments: ci_summary.html
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> *System configuration and information:*
> Single node Cassandra with Accord transactions enabled running on docker
> Built from commit:
> [a7cd114435704b988c81f47ef53d0bfd6441f38b|https://github.com/apache/cassandra/commit/a7cd114435704b988c81f47ef53d0bfd6441f38b]
> CQLSH: [cqlsh 6.2.0 | Cassandra 5.0-alpha2-SNAPSHOT | CQL spec 3.4.7 | Native
> protocol v5]
>
> *Steps to reproduce in CQLSH:*
> {code:java}
> CREATE KEYSPACE accord WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': '1'} AND durable_writes = true;{code}
> {code:java}
> CREATE TABLE accord.accounts (
> partition text,
> account_id int,
> balance counter,
> PRIMARY KEY (partition, account_id)
> ) WITH CLUSTERING ORDER BY (account_id ASC);
> {code}
> {code:java}
> BEGIN TRANSACTION
> UPDATE accord.accounts
> SET balance += 100
> WHERE
> partition = 'default'
> AND account_id = 0;
> UPDATE accord.accounts
> SET balance += 100
> WHERE
> partition = 'default'
> AND account_id =1;
> COMMIT TRANSACTION;{code}
> bug happens after executing the following statement:
> Based on [Cassandra
> documentation|https://cassandra.apache.org/doc/trunk/cassandra/developing/cql/types.html#counters]
> regarding the use of counters, I expect the following results:
> Transaction A: subtract 10 from the balance of account 1 (total ending
> balance of 90) and add 10 to the balance of account 0 (total ending balance
> of 110)
> {*}Bug A{*}: Neither account's balance is updated and the state of the rows
> is left unchanged
> {code:java}
> /* Transaction A */
> BEGIN TRANSACTION
> UPDATE accord.accounts
> SET balance -= 10
> WHERE
> partition = 'default'
> AND account_id = 1;
> UPDATE accord.accounts
> SET balance += 10
> WHERE
> partition = 'default'
> AND account_id = 0;
> COMMIT TRANSACTION;{code}
> Transaction B: subtract 10 from the balance of account 1 (total ending
> balance of 90) and add 10 to the balance of a new account 2 (total ending
> balance of 10)
> {*}Bug B{*}: Only the new account 2 is created. The balance of account 1 is
> left unchanged
> {code:java}
> /* Transaction B */
> BEGIN TRANSACTION
> UPDATE accord.accounts
> SET balance -= 10
> WHERE
> partition = 'default'
> AND account_id = 1;
> UPDATE accord.accounts
> SET balance += 10
> WHERE
> partition = 'default'
> AND account_id = 2;
> COMMIT TRANSACTION;{code}
> Bug / Error:
> ======================================================================
> The result of performing a table read after executing each buggy transaction
> is:
> {code:java}
> /* Transaction / Bug A */
> partition | account_id | balance
> -----------+------------+---------
> default | 0 | 100
> default | 1 | 100{code}
> {code:java}
> /* Transaction / Bug B */
> partition | account_id | balance
> -----------+------------+---------
> default | 0 | 100
> default | 1 | 100
> default | 2 | 10 {code}
> Note that performing the above statements without transaction blocks works as
> expected.
> {color:#172b4d}This was found while testing Accord transactions with
> [~henrik.ingo] and team.{color}
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