Michael Ho created IMPALA-9026:
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Summary: Add an option to use resolved IP address for Statestore
subscriber
Key: IMPALA-9026
URL: https://issues.apache.org/jira/browse/IMPALA-9026
Project: IMPALA
Issue Type: Improvement
Components: Distributed Exec
Affects Versions: Impala 3.4.0
Reporter: Michael Ho
Assignee: Michael Ho
Currently, statestore subscribers currently register with statestore using
their hostnames. There may be certain deployment scenarios in which a pod may
have an IP address but its DNS entry is not available for a valid reason (e.g.
a Kubernetes pod whose readiness probe returns false). An example could be that
there could be more than one instances of an Impala component (e.g.
coordinator) but only one of them will be active at a time and the rest will
serve as backup. In which case, we still want the backup coordinator to receive
any updates from statestore but not serve any queries until the primary
coordinator fails.
To handle the case above, we may allow statestore subscribers to register with
statestore using its IP address instead of hostname. This may not work with
some existing secure deployment in which TLS is enabled between Impala hosts as
there may be mismatch between the hostname used at Thrift layer and the
certificate so this option is disabled by default.
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