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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177845#comment-13177845
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jirapos...@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 2011-12-31 00:20:40.770066)
Review request for hbase, Eli Collins and Todd Lipcon.
Changes
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WritableContext makes things cleaner. Some space optimizations to make
compression even more efficient.
Summary
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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 (updated)
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src/main/java/org/apache/hadoop/hbase/HConstants.java 5120a3c
src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
PRE-CREATION
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/HLog.java 24407af
src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java f067221
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/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
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestSimpleDictionary.java
PRE-CREATION
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java
59910bf
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
>
>
> 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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