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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Fri, 13 Jan 2012 01:35:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185377#comment-13185377
] 

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 2012-01-13 01:34:31.569679)


Review request for hbase, Eli Collins and Todd Lipcon.


Changes
-------

fixed bug in dictionary causing another test to fail. passes small tests now. running med
tests.


Summary
-------

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)
-----

  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java PRE-CREATION

  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java 59910bf 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestLRUDictionary.java PRE-CREATION

  src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogReader.java d9cd6de

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

  src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALDictionary.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java e1117ef 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/LRUDictionary.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java 24407af 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java f067221 
  src/main/java/org/apache/hadoop/hbase/HConstants.java 5120a3c 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java PRE-CREATION

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

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

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


Testing
-------


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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