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https://issues.apache.org/jira/browse/HBASE-6032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284567#comment-13284567
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Zhihong Yu commented on HBASE-6032:
-----------------------------------
Integrated patch v2 to trunk.
> Port HFileBlockIndex improvement from HBASE-5987
> ------------------------------------------------
>
> Key: HBASE-6032
> URL: https://issues.apache.org/jira/browse/HBASE-6032
> Project: HBase
> Issue Type: Task
> Reporter: Zhihong Yu
> Assignee: Zhihong Yu
> Fix For: 0.96.0
>
> Attachments: 6032-ports-5987-v2.txt, 6032-ports-5987.txt
>
>
> Excerpt from HBASE-5987:
> First, we propose to lookahead for one more block index so that the
> HFileScanner would know the start key value of next data block. So if the
> target key value for the scan(reSeekTo) is "smaller" than that start kv of
> next data block, it means the target key value has a very high possibility in
> the current data block (if not in current data block, then the start kv of
> next data block should be returned. +Indexing on the start key has some
> defects here+) and it shall NOT query the HFileBlockIndex in this case. On
> the contrary, if the target key value is "bigger", then it shall query the
> HFileBlockIndex. This improvement shall help to reduce the hotness of
> HFileBlockIndex and avoid some unnecessary IdLock Contention or Index Block
> Cache lookup.
> This JIRA is to port the fix to HBase trunk, etc.
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