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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Tue, 03 Jan 2012 00:15:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178580#comment-13178580
] 

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/#review4172
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src/main/java/org/apache/hadoop/hbase/HConstants.java
<https://reviews.apache.org/r/2740/#comment9402>

    This name may refer to the compression algorithm.
    I think the word 'enable' should be part of the name.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
<https://reviews.apache.org/r/2740/#comment9403>

    No year needed.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
<https://reviews.apache.org/r/2740/#comment9404>

    This javadoc should be combined with above block.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
<https://reviews.apache.org/r/2740/#comment9405>

    Should read 'Compresses and ...'



src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressionContext.java
<https://reviews.apache.org/r/2740/#comment9407>

    Add license, please.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressionContext.java
<https://reviews.apache.org/r/2740/#comment9406>

    Add jaavdoc for this class, please.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java
<https://reviews.apache.org/r/2740/#comment9408>

    License, please.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java
<https://reviews.apache.org/r/2740/#comment9409>

    Add javadoc for the parameters, please.



src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java
<https://reviews.apache.org/r/2740/#comment9410>

    Should there be disableCompression ?



src/main/java/org/apache/hadoop/hbase/regionserver/wal/SimpleDictionary.java
<https://reviews.apache.org/r/2740/#comment9411>

    Remove this year line, please.


- Ted


On 2011-12-31 20:19:11, Li Pi wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/2740/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2011-12-31 20:19:11)
bq.  
bq.  
bq.  Review request for hbase, Eli Collins and Todd Lipcon.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  HLog compression. Has unit tests and a command line tool for compressing/decompressing.
bq.  
bq.  
bq.  This addresses bug HBase-4608.
bq.      https://issues.apache.org/jira/browse/HBase-4608
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    src/main/java/org/apache/hadoop/hbase/HConstants.java 5120a3c 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressionContext.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java 24407af 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java f067221 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogReader.java d9cd6de

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogWriter.java cbef70f

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/SimpleDictionary.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALDictionary.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java e1117ef 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestSimpleDictionary.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java 59910bf 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java
PRE-CREATION 
bq.  
bq.  Diff: https://reviews.apache.org/r/2740/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Li
bq.  
bq.


                
> 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
>
>
> 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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