[jira] [Updated] (RATIS-1216) State machine preAppend callback can throw exception without having leader to step down.

["Aravindan Vijayan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RATIS-1216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aravindan Vijayan updated RATIS-1216:
-------------------------------------
    Summary: State machine preAppend callback can throw exception without having leader to step down.  (was: State machine preAppend can throw exception without having leader to step down.)

> State machine preAppend callback can throw exception without having leader to step down.
> ----------------------------------------------------------------------------------------
>
>                 Key: RATIS-1216
>                 URL: https://issues.apache.org/jira/browse/RATIS-1216
>             Project: Ratis
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>            Reporter: Aravindan Vijayan
>            Priority: Major
>
> {code}
>       try {
>         state.appendLog(context);
>       } catch (StateMachineException e) {
>         // the StateMachineException is thrown by the SM in the preAppend stage.
>         // Return the exception in a RaftClientReply.
>         RaftClientReply exceptionReply = newExceptionReply(request, e);
>         cacheEntry.failWithReply(exceptionReply);
>         // leader will step down here
>         if (getInfo().isLeader()) {
>           leaderState.submitStepDownEvent(LeaderState.StepDownReason.STATE_MACHINE_EXCEPTION);
>         }
>         return CompletableFuture.completedFuture(exceptionReply);
>       }
> {code}
> The state machine can throw a StateMachine exception, which has a flag to disable leader step down action. The default for this flag would be true.



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