[jira] [Commented] (HBASE-28085) Configurably use scanner timeout as rpc timeout for scanner next calls

["Hudson (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-28085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17767845#comment-17767845 ] 

Hudson commented on HBASE-28085:
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Results for branch branch-2
	[build #886 on builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2/886/]: (x) *{color:red}-1 overall{color}*
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> Configurably use scanner timeout as rpc timeout for scanner next calls
> ----------------------------------------------------------------------
>
>                 Key: HBASE-28085
>                 URL: https://issues.apache.org/jira/browse/HBASE-28085
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Bryan Beaudreault
>            Assignee: Bryan Beaudreault
>            Priority: Major
>              Labels: patch-available
>
> In the AsyncTable implementation, scanner next() calls use "hbase.client.scanner.timeout.period" as the rpc timeout. The reason is described in comments, and makes a lot of sense:
> {code:java}
> // As we have a call sequence for scan, it is useless to have a different rpc timeout which is
> // less than the scan timeout. If the server does not respond in time(usually this will not
> // happen as we have heartbeat now), we will get an OutOfOrderScannerNextException when
> // resending the next request and the only way to fix this is to close the scanner and open a
> // new one. {code}
> The branch-2 HTable implementation still uses the old behavior – the next() call passes the read rpc timeout as the rpc timeout, and uses the scanner timeout period as the operation timeout. This can lead to the above behavior.
> It would be nice to provide users a migration path to AsyncTable's behavior, in the form of a config flag which causes HTable to use "hbase.client.scanner.timeout.period" as rpc timeout for next() calls like AsyncTable does.



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