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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4742) Prevent infinite loop with HBase 1.4 and DistinctPrefixFilter
Date Thu, 17 May 2018 22:28:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479832#comment-16479832
] 

James Taylor commented on PHOENIX-4742:
---------------------------------------

FYI, I'm looking at this now, [~sergey.soldatov]. It's a bug in the way descending row keys
are handled by DistinctPrefixFilter. We're generating a seek next hint that's smaller than
the current key. In HBase 1.4 this causes an infinite loop. In other versions of HBase, this
seems to just cause the filter to go to the next row. I'll try to tweak the logic correctly
for descending keys.

> Prevent infinite loop with HBase 1.4 and DistinctPrefixFilter
> -------------------------------------------------------------
>
>                 Key: PHOENIX-4742
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4742
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: Sergey Soldatov
>            Priority: Major
>
> OrderByIT.testOrderByReverseOptimizationWithNUllsLastBug3491 is the only test failing
on master (i.e. HBase 1.4). It's getting into an infinite loop when a reverse scan is done
for the DistinctPrefixFilter. It'd be nice to fix this so we can do a release for HBase 1.4.
At a minimum, we could disable DistinctPrefixFilter when a reverse scan is being done (for
HBase 1.4 only).



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