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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178580#comment-13178580
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jirapos...@reviews.apache.org commented on HBASE-4608:
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src/main/java/org/apache/hadoop/hbase/HConstants.java
<https://reviews.apache.org/r/2740/#comment9402>
This name may refer to the compression algorithm.
I think the word 'enable' should be part of the name.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
<https://reviews.apache.org/r/2740/#comment9403>
No year needed.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
<https://reviews.apache.org/r/2740/#comment9404>
This javadoc should be combined with above block.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java
<https://reviews.apache.org/r/2740/#comment9405>
Should read 'Compresses and ...'
src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressionContext.java
<https://reviews.apache.org/r/2740/#comment9407>
Add license, please.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressionContext.java
<https://reviews.apache.org/r/2740/#comment9406>
Add jaavdoc for this class, please.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java
<https://reviews.apache.org/r/2740/#comment9408>
License, please.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java
<https://reviews.apache.org/r/2740/#comment9409>
Add javadoc for the parameters, please.
src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java
<https://reviews.apache.org/r/2740/#comment9410>
Should there be disableCompression ?
src/main/java/org/apache/hadoop/hbase/regionserver/wal/SimpleDictionary.java
<https://reviews.apache.org/r/2740/#comment9411>
Remove this year line, please.
- Ted
On 2011-12-31 20:19:11, 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 2011-12-31 20:19:11)
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 5120a3c
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 24407af
bq. src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java
f067221
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/SimpleDictionary.java
PRE-CREATION
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/TestSimpleDictionary.java
PRE-CREATION
bq.
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java
59910bf
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, 4608v5.txt, 4608v6.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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