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https://issues.apache.org/jira/browse/HBASE-27048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Beaudreault updated HBASE-27048:
--------------------------------------
Labels: patch-available (was: )
Status: Patch Available (was: Open)
Submitted relatively simple PR for this:
[https://github.com/apache/hbase/pull/4562]
> Server side scanner time limit should account for time in queue
> ---------------------------------------------------------------
>
> Key: HBASE-27048
> URL: https://issues.apache.org/jira/browse/HBASE-27048
> Project: HBase
> Issue Type: Improvement
> Reporter: Bryan Beaudreault
> Assignee: Bryan Beaudreault
> Priority: Major
> Labels: patch-available
>
> When a scan request comes in with a timeout specified and heartbeats/partials
> allowed, we calculate a time limit for running the scan to be half of that
> timeout. The idea is to return before the timeout expires.
> The calculation of that time limit is "now + timeout / 2", where now is the
> point at which the scan is starting to run. What's missed here is the scan
> may have spent upwards of a few seconds in the IPC queue before being
> serviced. In this case, the time limit may extend beyond the timeout of the
> request and the server will not return in time.
> We should calculate the time limit from ServerCall.getReceiveTime instead to
> avoid these timeouts.
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