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jirapos...@reviews.apache.org commented on HBASE-4608: ------------------------------------------------------ ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: https://reviews.apache.org/r/2740/#review4585 ----------------------------------------------------------- Nice work. Will try out the Compressor tool. src/main/java/org/apache/hadoop/hbase/regionserver/wal/CompressedKeyValue.java <https://reviews.apache.org/r/2740/#comment10215> Should we verify that length is larger than pos ? src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java <https://reviews.apache.org/r/2740/#comment10216> I would expect different implementations to be instantiated based on the prefix of path. src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java <https://reviews.apache.org/r/2740/#comment10217> Why do we instantiate Configuration again (there is already one @ line 113) ? src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java <https://reviews.apache.org/r/2740/#comment10218> Typo, should read 'to start reading from'. src/main/java/org/apache/hadoop/hbase/regionserver/wal/Compressor.java <https://reviews.apache.org/r/2740/#comment10219> NOT_IN_DICTIONARY should be used here. - Ted On 2012-01-24 22:29:18, 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 2012-01-24 22:29:18) 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 8370ef8 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 e46a7a0 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira