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Date: Tue, 21 Feb 2012 19:31:48 +0000 (UTC)
From: "jiraposter@reviews.apache.org (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-4608) HLog Compression
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    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212831#comment-13212831 ] 

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 2012-02-21 19:29:20.464648)


Review request for hbase, Eli Collins and Todd Lipcon.


Changes
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addresses changes by reviewers above.


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)
-----

  src/main/java/org/apache/hadoop/hbase/HConstants.java 763fe89 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java c945a99 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java f067221 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/KeyValueCompression.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/LRUDictionary.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/util/Bytes.java ead9a3b 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestLRUDictionary.java PRE-CREATION 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java 23d27fd 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java PRE-CREATION 

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, 4608v13.txt, 4608v13.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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