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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10421) Investigate scan performance in 0.96 and later
Date Mon, 27 Jan 2014 18:35:53 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-10421:
-----------------------------------

    Affects Version/s: 0.98.0

> Investigate scan performance in 0.96 and later
> ----------------------------------------------
>
>                 Key: HBASE-10421
>                 URL: https://issues.apache.org/jira/browse/HBASE-10421
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>
> Testing the "internal friction" of scanning in HBase (all data in the block cache, and
all rows filtered at the server by a ValueFilter, so that one really measures the work HBase
does internally), I found that 0.98 is almost 35% slower than 0.94.
> Scanning 50m rows (one col each, 8 byte keys, 8 byte values) takes 13.2 in 0.94.17-SNAPSHOT
and 18.5s in 0.98.
> This probably came about with all the protobuf changes in 0.96.
> It should be possible to bring back to par with 0.94.



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