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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16213) A new HFileBlock structure for fast random get
Date Thu, 18 Aug 2016 09:04:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15426127#comment-15426127
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ramkrishna.s.vasudevan commented on HBASE-16213:
------------------------------------------------

I verfied the updated patch and the comments seems to be fixed. I have not checked the logic
of how the bytebuffers are traversed back and forth and I believe the test cases would have
caught them. 
May be there are lot of garbage getting generated because of lot of slices and duplicates.
I think that can be seen later if really it is a problem. As of now am fine with this patch.
+1.


> A new HFileBlock structure for fast random get
> ----------------------------------------------
>
>                 Key: HBASE-16213
>                 URL: https://issues.apache.org/jira/browse/HBASE-16213
>             Project: HBase
>          Issue Type: New Feature
>          Components: Performance
>            Reporter: binlijin
>            Assignee: binlijin
>         Attachments: HBASE-16213-master_v1.patch, HBASE-16213.patch, HBASE-16213_branch1_v3.patch,
HBASE-16213_v2.patch, hfile-cpu.png, hfile_block_performance.pptx, hfile_block_performance2.pptx,
new-hfile-block.xlsx
>
>
> HFileBlock store cells sequential, current when to get a row from the block, it scan
from the first cell until the row's cell.
> The new structure store every row's start offset with data, so it can find the exact
row with binarySearch.
> I use EncodedSeekPerformanceTest test the performance.
> First use ycsb write 100w data, every row have only one qualifier, and valueLength=16B/64/256B/1k.
> Then use EncodedSeekPerformanceTest to test random read 1w or 100w row, and also record
HFileBlock's dataSize/dataWithMetaSize in the encoding.



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