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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Wed, 14 Mar 2012 18:10:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229454#comment-13229454
] 

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



bq.  On 2012-03-14 17:42:21, Lars Hofhansl wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java, line 108
bq.  > <https://reviews.apache.org/r/4328/diff/2/?file=92102#file92102line108>
bq.  >
bq.  >     I assume we're entirely sure that a dictionary will never have > 2^15 entries.

It'll start evicting once it hits its max size, which is currently 2 ^ 15.


- Li


-----------------------------------------------------------
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On 2012-03-14 07:34:58, Michael Stack wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/4328/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2012-03-14 07:34:58)
bq.  
bq.  
bq.  Review request for hbase.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  See issue
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 045c6f3 
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/Dictionary.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java b5049b1 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java 311ea1b 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/KeyValueCompression.java PRE-CREATION

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 ff63a5f

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogWriter.java 01ebb5c

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java d8f317c 
bq.    src/main/java/org/apache/hadoop/hbase/util/Bytes.java de8e40b 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestCompressor.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestKeyValueCompression.java
PRE-CREATION 
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 a11899c 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplayCompressed.java
PRE-CREATION 
bq.  
bq.  Diff: https://reviews.apache.org/r/4328/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Michael
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: stack
>             Fix For: 0.94.0
>
>         Attachments: 4608-v19.txt, 4608-v20.txt, 4608-v22.txt, 4608v1.txt, 4608v13.txt,
4608v13.txt, 4608v14.txt, 4608v15.txt, 4608v16.txt, 4608v17.txt, 4608v18.txt, 4608v23.txt,
4608v24.txt, 4608v25.txt, 4608v27.txt, 4608v5.txt, 4608v6.txt, 4608v7.txt, 4608v8fixed.txt,
hbase-4608-v28-delta.txt, hbase-4608-v28.txt, hbase-4608-v28.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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