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Posted to issues@hbase.apache.org by "jiraposter@reviews.apache.org (Commented) (JIRA)" <ji...@apache.org> on 2011/11/07 11:27:53 UTC
[jira] [Commented] (HBASE-4608) HLog Compression

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145321#comment-13145321 ] 

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 2011-11-07 10:27:33.538403)


Review request for Eli Collins and Todd Lipcon.


Summary (updated)
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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.
    https://issues.apache.org/jira/browse/HBase-4608


Diffs
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  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


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
>
> 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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