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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8063) Filter HFiles based on first/last key
Date Tue, 12 Mar 2013 03:37:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599661#comment-13599661

Liang Xie commented on HBASE-8063:

O, seems there's a trouble here, my two thoughts
# generate keyvalue instances per scan.start/stopRow(seems current KeyValue class doesn't
have any methods like createKeyValueFromRow,right?), then compare with getFirstKey/getLastKey,
maybe we need to handle some details,e.g. kv's timestamp, type?  it's error-prone for me at
# shortcut MetaKeyComparator scenario, just return true if it's a MetaKeyComparator instance.
since our original idea is to optimize normal user hfile, not internal system hfile, it should
be ok.  I prefer to this choice.
[~zjushch], how about you?
> Filter HFiles based on first/last key
> -------------------------------------
>                 Key: HBASE-8063
>                 URL: https://issues.apache.org/jira/browse/HBASE-8063
>             Project: HBase
>          Issue Type: Improvement
>          Components: Scanners
>    Affects Versions: 0.98.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HBASE-8063.txt
> # hbase-5010 introduced a filter mechanism based on timerange hint
> # this jira is a placeholder just for keyrange hint: currently, low layer(hfile reader)
has first/last key getter methods already. we should utilize this information to pre-filte
hfiles while choosing scanners from storefiles.
> It's just a raw thought right now, no patch available yet. I'll summit a patch asap if
it's reasonable, welcome to give some suggestions/comments:)

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