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https://issues.apache.org/jira/browse/HIVE-26600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616132#comment-17616132
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Teddy Choi commented on HIVE-26600:
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Hello [~rakshithc] , please update the status and create a corresponding PR.
Thank you.
> Handle failover during optimized bootstrap
> ------------------------------------------
>
> Key: HIVE-26600
> URL: https://issues.apache.org/jira/browse/HIVE-26600
> Project: Hive
> Issue Type: Bug
> Reporter: Teddy Choi
> Assignee: Rakshith C
> Priority: Blocker
>
> when the reverse policy is enabled from DR to PROD, there is a situation
> wherein the user may initiate a failover from DR to PROD before the optimized
> bootstrap is ever run.
> Current observations:
> * Repl Dump will place a failover ready marker but failover metadata won't
> be generated.
> * Repl Load will throw an error since failover will be set to true but
> failovermetadata is missing.
> Replication fails and we reach an undefined state.
> Fix :
> * create failover ready marker only during second cycle of optimized
> bootstrap if possible.
> * since some tables may need to be bootstrapped, it may take upto 3 cycles
> before failover from DR to PROD is complete.
> * if no tables are modified, second dump from DR to PROD will be marked as
> failover ready.
> Result:
> * users can initiate a failover immediately after enabling reverse policy
> without any hassles.
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