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Date: Wed, 15 Feb 2012 05:24:01 +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=13208234#comment-13208234 ] 

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/#review5113
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src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java
<https://reviews.apache.org/r/2740/#comment11203>

    FileSystem has the following methods:
    
      /** Returns the configured filesystem implementation.*/
      public static FileSystem get(Configuration conf) throws IOException {
    
      public static FileSystem get(URI uri, Configuration conf) throws IOException {
    
    I think the second get() should allow you to read HLog on hdfs


- Ted


On 2012-02-15 04:57:45, 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 2012-02-15 04:57:45)
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 763fe89 
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 e46a7a0 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java f067221 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/LRUDictionary.java PRE-CREATION 
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/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/TestLRUDictionary.java PRE-CREATION 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java 23d27fd 
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, 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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