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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9440) Pass blocks of KVs from HFile scanner to the StoreFileScanner and up
Date Fri, 13 Sep 2013 22:26:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767061#comment-13767061
] 

stack commented on HBASE-9440:
------------------------------

bq. So when data is on disk, we're pretty close to what we can read from HFiles. 

You mean going via front door?

What should take-away be?  What we need to dig in on?  To go faster, we need to do the prefixtreeblocks
and pull blocks up out of hfile?
                
> Pass blocks of KVs from HFile scanner to the StoreFileScanner and up
> --------------------------------------------------------------------
>
>                 Key: HBASE-9440
>                 URL: https://issues.apache.org/jira/browse/HBASE-9440
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>
> Currently we read KVs from an HFileScanner one-by-one and pass them up the scanner/heap
tree. Many time the ranges of KVs retrieved from StoreFileScanner (by StoreScanners) and HFileScanner
(by StoreFileScanner) will be non-overlapping. If chunks of KVs do not overlap we can sort
entire chunks just by comparing the start/end key of the chunk. Only if chunks are overlapping
do we need to sort KV by KV as we do now.
> I have no patch, but I wanted to float this idea. 

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