[jira] [Created] (HIVE-26600) Handle failover during optimized bootstrap

["Teddy Choi (Jira)" <ji...@apache.org>]

Teddy Choi created HIVE-26600:
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             Summary: 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


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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