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https://issues.apache.org/jira/browse/IMPALA-7163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Ho reassigned IMPALA-7163:
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Assignee: Sailesh Mukil (was: Michael Ho)
> Implement a state machine for the QueryState class
> --------------------------------------------------
>
> Key: IMPALA-7163
> URL: https://issues.apache.org/jira/browse/IMPALA-7163
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Reporter: Sailesh Mukil
> Assignee: Sailesh Mukil
> Priority: Major
>
> We've recently been improving our query lifecycle by adding explicit state
> transitions so it's easier to reason about what should happen at a given
> stage in the lifetime of a query or a fragment instance.
> On the coordinator side. The coordinator's view of the query:
> https://github.com/apache/impala/commit/6ca87e46736a1e591ed7d7d5fee05b4b4d2fbb50
> On the fragment instance state side. A FIS's view of its own execution:
> https://github.com/apache/impala/blob/e12ee485cf4c77203b144c053ee167509cc39374/be/src/runtime/fragment-instance-state.h#L182-L203
> We don't have something like this for the QueryState class which maintains
> query wide state per executor. Adding it should make the lifecycle of a query
> from an executors point of view much easier to reason about.
> Additional info: This was identified as part of work for
> IMPALA-2990/IMPALA-4063, and is a precursor to it.
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