[jira] [Comment Edited] (RATIS-670) Add a metric to track StateMachine Log apply index

["Shashikant Banerjee (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RATIS-670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928159#comment-16928159 ] 

Shashikant Banerjee edited comment on RATIS-670 at 9/12/19 3:15 AM:
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Thanks [~sdeka] for updating the patch. StateMachineUpdater increments the applied index as soon as the call to applyLogToStateMachine happens, but doesn't wait for the transactions to complete unless it needs to take a snapshot.. Would it make more sense to update the applied index in the metrics by fetching it from StateMachine rather that what is maintained in StateMachineUpdater?


was (Author: shashikant):
Thanks [~sdeka] for updating the patch. StateMachineUpdater increments the applied index as soon as the call to applyLogToStateMachine happens, but doesn't wait for the transactions to complete unless it needs to take a snapshot.. Would it make more sense to update the applied index in the metrics by fetching it from StateMachine rather that what is maintainned in StateMachineUpdater?

> Add a metric to track StateMachine Log apply index
> --------------------------------------------------
>
>                 Key: RATIS-670
>                 URL: https://issues.apache.org/jira/browse/RATIS-670
>             Project: Ratis
>          Issue Type: Sub-task
>          Components: server
>            Reporter: Supratim Deka
>            Assignee: Supratim Deka
>            Priority: Major
>         Attachments: RATIS-670.000.patch, RATIS-670.001.patch
>
>
> Plotting the Log apply index (log index applied on the StateMachine) against the RaftLog commit index, is useful in monitoring the performance of the statemachine.
> This jira adds a metric/gauge which tracks the current value of log apply index.



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