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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183023#comment-13183023
]
[email protected] commented on HBASE-4608:
------------------------------------------------------
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java,
line 35
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67060#file67060line35>
bq. >
bq. > Add javadoc please.
Done.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java,
line 84
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67060#file67060line84>
bq. >
bq. > Please give this config parameter better name.
bq. > How about 'hbase.regionserver.wal.compressed' ?
Done.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java,
line 91
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67060#file67060line91>
bq. >
bq. > Would this be able to hold large number of HLog.Entry's in memory ?
An HLog is at most 400mb, should be okay?
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java,
line 229
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67060#file67060line229>
bq. >
bq. > Since short is signed, how do I know that the return value would be
positive ?
bq. > e.g. (short)0xFE00 == -512
if the hi bit is negative, (we read that), then we do something else, because
its not part of the dictionary. added an assert anyways.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. >
src/main/java/org/apache/hadoop/hbase/regionserver/wal/LRUDictionary.java, line
166
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67063#file67063line166>
bq. >
bq. > I suggest naming this class Node.
Done.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java,
line 74
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67067#file67067line74>
bq. >
bq. > Is compressed a better name ?
Done.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java,
line 127
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67067#file67067line127>
bq. >
bq. > White space makes indentation look weird.
fixed.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. >
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestLRUDictionary.java,
line 1
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67068#file67068line1>
bq. >
bq. > Please add Apache license.
fixed.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. >
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestLRUDictionary.java,
line 12
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67068#file67068line12>
bq. >
bq. > Add short javadoc and test category, please.
test category - small?
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. >
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java,
line 2
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67070#file67070line2>
bq. >
bq. > Please remove year.
Done.
bq. On 2012-01-07 05:18:45, Ted Yu wrote:
bq. >
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java,
line 29
bq. > <https://reviews.apache.org/r/2740/diff/8/?file=67070#file67070line29>
bq. >
bq. > You will add the real test, right ?
bq. >
bq. > Also, missing test category.
This is actually a really good test. If testWALReplay works after compression
is enabled, then the compression/decompression is working. This is the real
test.
- Li
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2740/#review4232
-----------------------------------------------------------
On 2012-01-10 02:34:06, 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 2012-01-10 02:34:06)
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/LRUDictionary.java
PRE-CREATION
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/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/TestLRUDictionary.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, 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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