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Posted to issues@ratis.apache.org by "Tian Jiang (Jira)" <ji...@apache.org> on 2025/08/12 08:59:00 UTC

[jira] [Created] (RATIS-2321) ServerState NPE when changing leader continuously

Tian Jiang created RATIS-2321:
---------------------------------

             Summary: ServerState NPE when changing leader continuously
                 Key: RATIS-2321
                 URL: https://issues.apache.org/jira/browse/RATIS-2321
             Project: Ratis
          Issue Type: Bug
          Components: server
    Affects Versions: 3.2.0
            Reporter: Tian Jiang
         Attachments: image-2025-08-12-16-52-21-717.png, image-2025-08-12-16-53-56-259.png

Dear developers, 

I encountered an NPE when using Ratis. It says:

!image-2025-08-12-16-52-21-717.png!

The related code is here (at commit RATIS-2317. Move acquire PendingRequestPermit out of synchronized block in RaftServerImpl#appendTransaction. (#1275)):

!image-2025-08-12-16-53-56-259.png!

When the leader changes, the lasterNoLeaderTime is set to null.

If the leader changes again, without being set to a null leader first, then the variable `previous` will be null, which triggers an NPE. 



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