[jira] [Comment Edited] (RATIS-670) Add a metric to track the lag between Log commit and Log apply index

["Supratim Deka (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RATIS-670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16926835#comment-16926835 ] 

Supratim Deka edited comment on RATIS-670 at 9/10/19 6:44 PM:
--------------------------------------------------------------

patch 001, added a gauge to directly get the value of applied index, instead of recording diff with commitIndex.
this is as per review discussion with [~shashikant] and mukul.


was (Author: sdeka):
patch 002, added a gauge to directly get the value of applied index, instead of recording diff with commitIndex.
this is as per review discussion with [~shashikant] and mukul.

> Add a metric to track the lag between Log commit and 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
>
>
> The following metric will track by how many entries the log apply index is lagging behind the log commit index for the local Ratis log. It should be noted that log apply will always lag log commit.
> |logCommitToLogApplyDiff|The difference between lastApplied Index and log Commit Index on each of Ratis server. This will give an indication of how the stateMachine is behaving with respect to the incoming load.|



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