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Posted to commits@cassandra.apache.org by "Dinesh Joshi (Jira)" <ji...@apache.org> on 2020/02/01 00:33:00 UTC
[jira] [Commented] (CASSANDRA-15350) Add CAS “uncertainty” and “contention" messages that are currently propagated as a WriteTimeoutException.
[ https://issues.apache.org/jira/browse/CASSANDRA-15350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027909#comment-17027909 ]
Dinesh Joshi commented on CASSANDRA-15350:
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I think the overall PR looks good. I just had a few minor nits that I've mocked [here|https://github.com/yifan-c/cassandra/commit/b9a58b38cf9ce85203021bd48f89d98d0f69acd5]. Please feel free to cherry pick.
> Add CAS “uncertainty” and “contention" messages that are currently propagated as a WriteTimeoutException.
> ---------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15350
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15350
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Lightweight Transactions
> Reporter: Alex Petrov
> Assignee: Yifan Cai
> Priority: Normal
> Labels: protocolv5, pull-request-available
> Attachments: Utf8StringEncodeBench.java
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Right now, CAS uncertainty introduced in https://issues.apache.org/jira/browse/CASSANDRA-6013 is propagating as WriteTimeout. One of this conditions it manifests is when there’s at least one acceptor that has accepted the value, which means that this value _may_ still get accepted during the later round, despite the proposer failure. Similar problem happens with CAS contention, which is also indistinguishable from the “regular” timeout, even though it is visible in metrics correctly.
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