[jira] [Updated] (CASSANDRA-18866) Node sends multiple inflight echos

["Stefan Miklosovic (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-18866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Miklosovic updated CASSANDRA-18866:
------------------------------------------
    Reviewers: Stefan Miklosovic
       Status: Review In Progress  (was: Patch Available)

> Node sends multiple inflight echos
> ----------------------------------
>
>                 Key: CASSANDRA-18866
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18866
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Cluster/Gossip
>            Reporter: Cameron Zemek
>            Assignee: Cameron Zemek
>            Priority: Normal
>         Attachments: 18866-regression.patch, duplicates.log, echo.log
>
>
> CASSANDRA-18854 rolled back the changes from CASSANDRA-18845. In particular, 18845 had change to only allow 1 inflight ECHO request at a time. As per 18854 some tests have an error rate due to this change. Creating this ticket to discuss this further. As the current state also does not have retry logic, it just allowing multiple ECHO requests inflight at the same time so less likely that all ECHO will timeout or get lost.
> With the change from 18845 adding in some extra logging to track what is going on, I do see it retrying ECHOs. Likewise, I patched a node to drop ECHO requests from a node and also see it retrying ECHOs when it doesn't get a reply.
> Therefore, I think the problem is more specific than the dropping of one ECHO request. Yes there no retry logic for failed ECHO requests, but this is the case even both before and after 18845. ECHO requests are only sent via gossip verb handlers calling applyStateLocally. In these failed tests I therefore assuming their cases where it won't call markAlive when other nodes consider the node UP but its marked DOWN by a node.



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