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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Mon, 07 Nov 2011 23:12:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145924#comment-13145924

jiraposter@reviews.apache.org commented on HBASE-4608:

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(Updated 2011-11-07 23:12:37.111204)

Review request for hbase, Eli Collins and Todd Lipcon.


Heres what I have so far. Things are written, and "should work". I need to rework the test
cases to test this, and put something in the config file to enable/disable. Obviously this
isn't ready for commit at the moment, but I can get those two things done pretty quickly.

Obviously the dictionary is incredibly simple at the moment, I'll come up with something cooler
sooner. Let me know how this looks.

This addresses bug HBase-4608.


  src/main/java/org/apache/hadoop/hbase/KeyValue.java e68e486 
  src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java PRE-CREATION

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

  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 

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




> 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
> 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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