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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10884) [REST] Do not disable block caching when scanning
Date Thu, 10 Apr 2014 16:40:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965513#comment-13965513

Andrew Purtell commented on HBASE-10884:

Test failure is not related, will commit soon.

Ping [~stack] and [~lhofhansl], I'm going to assume no objection to trivial patch and perf
improvement, but limited to REST use cases.

> [REST] Do not disable block caching when scanning
> -------------------------------------------------
>                 Key: HBASE-10884
>                 URL: https://issues.apache.org/jira/browse/HBASE-10884
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.98.1,, 0.94.18
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>         Attachments: HBASE-10884.patch
> The REST gateway pessimistically disables block caching when issuing Scans to the cluster,
using Scan#setCacheBlocks(false) in ScannerResultGenerator. It does not do this when issuing
Gets on behalf of HTTP clients in RowResultGenerator. This is an old idea now, the reasons
for doing so lost sometime back in the era when HBase walked the earth with dinosaurs (<
0.20). We probably should not be penalizing REST scans in this way. 

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