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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Wed, 14 Mar 2012 06:48:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229027#comment-13229027
] 

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/4328/
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Review request for hbase.


Summary
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See issue


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


Diffs
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  src/main/java/org/apache/hadoop/hbase/HConstants.java 045c6f3 
  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 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/Dictionary.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java b5049b1 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java 311ea1b 
  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 ff63a5f

  src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogWriter.java 01ebb5c

  src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java d8f317c 
  src/main/java/org/apache/hadoop/hbase/util/Bytes.java de8e40b 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestCompressor.java PRE-CREATION

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

  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java a11899c 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java PRE-CREATION


Diff: https://reviews.apache.org/r/4328/diff


Testing
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Thanks,

Michael


                
> HLog Compression
> ----------------
>
>                 Key: HBASE-4608
>                 URL: https://issues.apache.org/jira/browse/HBASE-4608
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Li Pi
>            Assignee: stack
>             Fix For: 0.94.0
>
>         Attachments: 4608-v19.txt, 4608-v20.txt, 4608-v22.txt, 4608v1.txt, 4608v13.txt,
4608v13.txt, 4608v14.txt, 4608v15.txt, 4608v16.txt, 4608v17.txt, 4608v18.txt, 4608v23.txt,
4608v24.txt, 4608v25.txt, 4608v27.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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