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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7845) optimize hfile index key
Date Sun, 03 Mar 2013 05:39:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591646#comment-13591646
] 

Liang Xie commented on HBASE-7845:
----------------------------------

Diving into the failed cases, it somehow really funny to me :)
#TestHalfStoreFileReader failed, due to there's an offset(-1) based on the optimized index
key, so we need to treak the target midkey in split test cases.
#TestHFileWriterV2 failed due to call append(final byte[] key, final byte[] value) api, without
setting any ts, it'll never exist in real path.
#most interesting failed case: TestBlocksScanned, after debugging, i found the api blockSeek()
has a diff rule/convention with upper consumers, i'll file a bug on it.
                
> optimize hfile index key
> ------------------------
>
>                 Key: HBASE-7845
>                 URL: https://issues.apache.org/jira/browse/HBASE-7845
>             Project: HBase
>          Issue Type: Improvement
>          Components: HFile
>    Affects Versions: 0.96.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HBASE-7845.txt, HBASE-7845-v2.txt
>
>
> Leveldb uses ByteWiseComparatorImpl::FindShortestSeparator() & FindShortSuccessor()
to reduce index key size, it would be helpful under special conditions.

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