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Posted to issues@ozone.apache.org by "Li Cheng (Jira)" <ji...@apache.org> on 2020/12/07 05:14:00 UTC
[jira] [Updated] (HDDS-3988) DN can distinguish SCMCommand from
stale leader SCM
[ https://issues.apache.org/jira/browse/HDDS-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Li Cheng updated HDDS-3988:
---------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
> DN can distinguish SCMCommand from stale leader SCM
> ---------------------------------------------------
>
> Key: HDDS-3988
> URL: https://issues.apache.org/jira/browse/HDDS-3988
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: SCM
> Reporter: Glen Geng
> Assignee: Glen Geng
> Priority: Major
> Labels: pull-request-available
>
> As part of SCMCommand SCM will also send its current term, which will be used in Datanode to identify if the command was sent by the latest leader SCM.
>
> Datanode will maintain the highest term that it has seen and compare it with the term that is received as part of SCMCommand.
> * If the term in the Datanode and SCMCommand are same, the command is added to the command queue for processing.
> * If the term in the Datanode is less than the term received in SCMCommand, Datanode will update its term and add the command to the command queue for processing.
> * If the term in the Datanode is greater than the term received in SCMCommand, Datanode will ignore the command.
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