Wenzhe Zhou created IMPALA-12150:
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Summary: Allow executors to register to two statestores
Key: IMPALA-12150
URL: https://issues.apache.org/jira/browse/IMPALA-12150
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Wenzhe Zhou
Assignee: Wenzhe Zhou
Impala assume single statestore instance in an Impala cluster and each
statestore subscriber can register to only one statestore instance. Since
cluster membership is maintained by statestore, each executor and coordinator
can join only one cluster.
For rolling upgrade with zero downtime, we need create two clusters -
blue/green clusters. Each cluster with its own statestore and catalogd. To
avoid cluster size reduction during rolling upgrade, we should allow the
upgraded executors to join two clusters.
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