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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-887) Fix a hotspot in scanners
Date Sun, 28 Sep 2008 04:59:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635214#action_12635214
] 

Jonathan Gray commented on HBASE-887:
-------------------------------------

In additional testing, I've uncovered a very strange behavior running on 0.19 trunk that does
not happen in 0.18 branch.

This is the only issue I know of that could cause this problem.

Will provide more info tomorrow and file new jira.

> Fix a hotspot in scanners
> -------------------------
>
>                 Key: HBASE-887
>                 URL: https://issues.apache.org/jira/browse/HBASE-887
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: client, regionserver
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.19.0
>
>         Attachments: 877-chart.jpg, hbase-887-v1.patch, Scanning Benchmarks.pdf
>
>
> When scanning, we do a lot of RPCs and this has a huge performance hit. I propose that
we add a way to fetch more rows during next() and put them in cache. This should be configurable.

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