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https://issues.apache.org/jira/browse/KAFKA-12958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17369935#comment-17369935
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HaiyuanZhao edited comment on KAFKA-12958 at 6/26/21, 6:16 PM:
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Hi, [~jagsancio] I added an invariant that notified leaders are never asked to
load snapshots. However, the test case canRecoverAfterAllNodesKilled failed,
this is easy to reproduce. and the case detail is followed.
*New Invariant*
*Run Result*
The ** handleSnapshot callstack is followed. This callstack indicated that
the new leader may have a chance to catch up by loadingSnaphost if its listener
is lagging. And the fireSnapshot call comes from KAFKA-12154, commit: 6203bf8.
I am not sure if this is expected. Could you please take a look?
!image-2021-06-27-02-09-25-296.png!
*!image-2021-06-27-02-15-23-760.png!*
was (Author: zhaohaidao):
Hi, [~jagsancio] I added an invariant that notified leaders are never asked to
load snapshots. However, the test case canRecoverAfterAllNodesKilled failed,
this is easy to reproduce. and the case detail is followed.
*New Invariant*
*Run Result*
The ** handleSnapshot callstack is followed. This callstack indicated that
the new leader may have a chance to catch up by loadingSnaphost if its listener
is lagging. And the fireSnapshot call comes from KAFKA-12154, which commit is
6203bf8.
I am not sure if this is expected. Could you please take a look?
!image-2021-06-27-02-09-25-296.png!
*!image-2021-06-27-02-15-23-760.png!*
> Add simulation invariant for leadership and snapshot
> ----------------------------------------------------
>
> Key: KAFKA-12958
> URL: https://issues.apache.org/jira/browse/KAFKA-12958
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Jose Armando Garcia Sancio
> Assignee: HaiyuanZhao
> Priority: Major
> Attachments: image-2021-06-27-02-09-25-296.png,
> image-2021-06-27-02-15-23-760.png
>
>
> During the simulation we should add an invariant that notified leaders are
> never asked to load snapshots. The state machine always sees the following
> sequence of callback calls:
> Leaders see:
> ...
> handleLeaderChange state machine is notify of leadership
> handleSnapshot is never called
> Non-leader see:
> ...
> handleLeaderChange state machine is notify that is not leader
> handleSnapshot is called 0 or more times
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