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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8420) Port HBASE-6874 Implement prefetching for scanners from 0.89-fb
Date Wed, 08 May 2013 18:17:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13652160#comment-13652160
] 

Jean-Daniel Cryans commented on HBASE-8420:
-------------------------------------------

I think we need a way to keep track of the total size of what's being pre-fetched, and make
sure we can keep it under a certain size. I can totally see a badly behaving client opening
a lot of scanners, pre-fetching enabled, and then we're stuck with a lot of garbage in memory.
Sure, we're going to clean it in a minute, but I've also seen cases where hundreds of scanners
are created per minute.

Else, this feature is a sure way to get users to DDOS themselves.
                
> Port  HBASE-6874  Implement prefetching for scanners from 0.89-fb
> -----------------------------------------------------------------
>
>                 Key: HBASE-8420
>                 URL: https://issues.apache.org/jira/browse/HBASE-8420
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>         Attachments: 0.94-8420_v1.patch, 0.94-8420_v2.patch, trunk-8420_v1.patch, trunk-8420_v2.patch
>
>
> This should help scanner performance.  We should have it in trunk.

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