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Date: Wed, 4 Sep 2013 23:42:52 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Created] (HBASE-9440) Pass blocks of KVs from HFile scanner
 to the StoreFileScanner and up
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Lars Hofhansl created HBASE-9440:
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             Summary: 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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