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https://issues.apache.org/jira/browse/PHOENIX-5514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gokcen Iskender updated PHOENIX-5514:
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Attachment: PHOENIX-5514.master.001.patch
> Index read repair should use index rpc handlers
> -----------------------------------------------
>
> Key: PHOENIX-5514
> URL: https://issues.apache.org/jira/browse/PHOENIX-5514
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 4.14.3
> Reporter: Geoffrey Jacoby
> Assignee: Gokcen Iskender
> Priority: Major
> Fix For: 4.15.0, 5.1.0
>
> Attachments: PHOENIX-5514.master.001.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Consider base tables T1 and T2, each of which has a global mutable index,
> call them IDX1 and IDX2.
> RegionServer A hosts a T1 region and an IDX2 region.
> RegionServer B hosts a T2 region and an IDX1 region.
>
> Because of prior problems, both IDX1 and IDX2 have lots of unverified rows.
> Both are under heavy read-load from clients.
>
> IDX1 coprocs try to scan the T1 region on RS A, but can't because the
> standard RPC queue is full on RS A because of all the IDX2 clients waiting on
> cross-server read repairs.
> IDX2 coprocs try to scan the T2 region on RS B, but can't because the
> standard RPC queue is full on RS B because of the IDX1 clients waiting on
> cross-server read repairs .
>
> It's not a permanent deadlock (eventually we'll start throwing
> RegionTooBusyExceptions), but it would be unpleasant for clients.
>
> If read-repair used the index RPC pool instead of the standard one, this
> scenario couldn't happen (unless there were _also_ too many mutable index
> writes, in which case we're just saturated and back to lots of exceptions.)
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