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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Tue, 24 Jan 2012 22:26:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192622#comment-13192622
] 

jiraposter@reviews.apache.org commented on HBASE-4608:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2740/
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(Updated 2012-01-24 22:26:21.830142)


Review request for hbase, Eli Collins and Todd Lipcon.


Changes
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last diff was against the wrong (non-trunk) branch.


Summary
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HLog compression. Has unit tests and a command line tool for compressing/decompressing.


This addresses bug HBase-4608.
    https://issues.apache.org/jira/browse/HBase-4608


Diffs (updated)
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  src/main/java/org/apache/hadoop/hbase/io/hfile/CacheConfig.java c92cc02 

Diff: https://reviews.apache.org/r/2740/diff


Testing
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Thanks,

Li


                
> HLog Compression
> ----------------
>
>                 Key: HBASE-4608
>                 URL: https://issues.apache.org/jira/browse/HBASE-4608
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Li Pi
>            Assignee: Li Pi
>         Attachments: 4608v1.txt, 4608v5.txt, 4608v6.txt, 4608v7.txt, 4608v8fixed.txt
>
>
> The current bottleneck to HBase write speed is replicating the WAL appends across different
datanodes. We can speed up this process by compressing the HLog. Current plan involves using
a dictionary to compress table name, region id, cf name, and possibly other bits of repeated
data. Also, HLog format may be changed in other ways to produce a smaller HLog.

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