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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Tue, 10 Jan 2012 19:22:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183495#comment-13183495
] 

Zhihong Yu commented on HBASE-4608:
-----------------------------------

I got the following on my MacBook for 4608v9.txt:
{code}
testReplayEditsWrittenViaHRegion(org.apache.hadoop.hbase.regionserver.wal.TestWALReplayCompressed)
 Time elapsed: 2.009 sec  <<< FAILURE!
java.lang.AssertionError
  at org.junit.Assert.fail(Assert.java:92)
  at org.junit.Assert.assertTrue(Assert.java:43)
  at org.junit.Assert.assertTrue(Assert.java:54)
  at org.apache.hadoop.hbase.regionserver.wal.TestWALReplay.testReplayEditsWrittenViaHRegion(TestWALReplay.java:289)
{code}
                
> 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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