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https://issues.apache.org/jira/browse/PHOENIX-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Samarth Jain updated PHOENIX-2487:
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Summary: Make queries fail faster (was: Use a completion service on the
client to fetch scan results)
> Make queries fail faster
> ------------------------
>
> Key: PHOENIX-2487
> URL: https://issues.apache.org/jira/browse/PHOENIX-2487
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Samarth Jain
>
> In my testing I have seen instances where the scanners failed on the server
> side (due to lease expiration errors), but the queries took much longer to
> fail.
> This is because after submitting the scan callable tasks to the Phoenix
> client thread pool, we wait for the corresponding futures to complete in the
> same order as we submitted the tasks. Instead, we should poll for the results
> as an when they are available and then rejigger them in the order desired.
> Then in such failure situations queries would fail much faster than they
> would have. This would also help us to do a more eager cleanup of scan tasks
> corresponding to failed queries that are queued and not yet kicked off.
> A possible implementation to use here would be the CompletionService.
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