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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16296) Reverse scan performance degrades when scanner cache size matches page filter size
Date Thu, 28 Jul 2016 19:33:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398092#comment-15398092
] 

James Taylor commented on HBASE-16296:
--------------------------------------

Yes, that sounds like you're able to repro now. That 140ms pause is the weird thing. And it
seems related to how much data is there (as we can't detect it without a fair amount of data).

> Reverse scan performance degrades when scanner cache size matches page filter size
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-16296
>                 URL: https://issues.apache.org/jira/browse/HBASE-16296
>             Project: HBase
>          Issue Type: Bug
>            Reporter: James Taylor
>         Attachments: generatedata-snippet.java, repro-snippet.java
>
>
> When a reverse scan is done, the server seems to not know it's done when the scanner
cache size matches the number of rows in a PageFilter. See PHOENIX-3121 for how this manifests
itself. We have a standalone, pure HBase API reproducer too that I'll attach (courtesy of
[~churromorales] and [~mujtabachohan]).



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