[jira] [Commented] (CASSANDRA-19436) When transitioning to Accord migration it's not safe to read immediately using Accord due to concurrent non-serial writes
[ https://issues.apache.org/jira/browse/CASSANDRA-19436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17820837#comment-17820837 ] Ariel Weisberg commented on CASSANDRA-19436: Also need to consider materialized views in the future which make additional mutations downstream. > When transitioning to Accord migration it's not safe to read immediately > using Accord due to concurrent non-serial writes > - > > Key: CASSANDRA-19436 > URL: https://issues.apache.org/jira/browse/CASSANDRA-19436 > Project: Cassandra > Issue Type: Bug >Reporter: Ariel Weisberg >Priority: Normal > > Concurrent writes at the same time that migration starts make it unsafe to > read from Accord because txn recovery will not be deterministic in the > presences of writes not done through Accord. > Adding key migration to non-serial writes could solve this by causing writes > not going through Accord to be rejected at nodes where key migration already > occurred. -- This message was sent by Atlassian Jira (v8.20.10#820010) - To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Commented] (CASSANDRA-19436) When transitioning to Accord migration it's not safe to read immediately using Accord due to concurrent non-serial writes
[ https://issues.apache.org/jira/browse/CASSANDRA-19436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17820826#comment-17820826 ] Ariel Weisberg commented on CASSANDRA-19436: This issue covers detecting and generating the appropriate refusal to accept a read/write on the wrong system. Accord and Paxos already do this detection, but non-SERIAL operations do not. The linked issues cover this, but also the loop in read/write that receives the error and automatically retries instead of failing the query. > When transitioning to Accord migration it's not safe to read immediately > using Accord due to concurrent non-serial writes > - > > Key: CASSANDRA-19436 > URL: https://issues.apache.org/jira/browse/CASSANDRA-19436 > Project: Cassandra > Issue Type: Bug >Reporter: Ariel Weisberg >Priority: Normal > > Concurrent writes at the same time that migration starts make it unsafe to > read from Accord because txn recovery will not be deterministic in the > presences of writes not done through Accord. > Adding key migration to non-serial writes could solve this by causing writes > not going through Accord to be rejected at nodes where key migration already > occurred. -- This message was sent by Atlassian Jira (v8.20.10#820010) - To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org
