[jira] [Assigned] (IGNITE-15705) Investigate raft client timeouts

["Mirza Aliev (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-15705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mirza Aliev reassigned IGNITE-15705:
------------------------------------

    Assignee: Mirza Aliev

> Investigate raft client timeouts
> --------------------------------
>
>                 Key: IGNITE-15705
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15705
>             Project: Ignite
>          Issue Type: Task
>            Reporter: Kirill Gusakov
>            Assignee: Mirza Aliev
>            Priority: Critical
>              Labels: ignite-3
>
> h3. Problem
> Raft client timeout should be large enough for the operation to be performed even if it falls on several consecutive rounds of choosing a new leader of the raft group. Most of jraft timeouts are based on electionTimeoutMs.
> {code:java}
> // A follower would become a candidate if it doesn't receive any message
> // from the leader in |election_timeout_ms| milliseconds
> // Default: 1000 (1s)
> private int electionTimeoutMs = 1000; // follower to candidate timeout
> {code}
>  For example both voteTime and electionTime use exact value of getElectionTimeoutMs (1000 ms):
> {code:java}
> String name = "JRaft-VoteTimer-" + suffix;
>         this.voteTimer = new RepeatedTimer(name, options.getElectionTimeoutMs(), timerFactory.getVoteTimer(name)) {...};
>         name = "JRaft-ElectionTimer-" + suffix;
>         electionTimer = new RepeatedTimer(name, options.getElectionTimeoutMs(), timerFactory.getElectionTimer(name)) {...};
> {code}
> Going back to client timeout, seems that it should be greater than reasonableAmountOfElecionRounds(electionTime + networkTimeoutToRetrieveAcks).
> So seems that we should check the value of “networkTimeoutToRetrieveAcks” and set client timeout to the corresponding value.
> Not sure whether it’s a good idea but let’s also consider raft client timeout to be derivative of leader election timeout not only semantically but also within code:
> {code:java}
> private static final int TIMEOUT = 10 * leaderElectionTimeout;{code}



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