[jira] [Comment Edited] (HBASE-9440) Pass blocks of KVs from HFile scanner to the StoreFileScanner and up

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13766223#comment-13766223 ] 

Lars Hofhansl edited comment on HBASE-9440 at 9/13/13 4:28 AM:
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Tested HFileReaderV2.ScannerV2 directly. It can scan 45m rows (1 column with a 100 byte value, everything in the blockcache) in 1.9s. So that would the theoretical maximum until we change the HFile format again.

                
      was (Author: lhofhansl):
    Tested HFileReaderV2.ScannerV2 directly. It can scan 45m rows (1 column with a 10 byte value, everything in the blockcache) in 1.9s. So that would the theoretical maximum until we change the HFile format again.

                  
> 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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