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From "stack (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4608) HLog Compression
Date Thu, 15 Mar 2012 19:36:37 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-4608:
-------------------------

      Resolution: Fixed
        Assignee: Li Pi  (was: stack)
    Release Note: Adds a custom dictionary-based compression on WAL.  Off by default.  To
enable, set hbase.regionserver.wal.enablecompression to true in hbase-site.xml.  (was: Patch
for WAL Compression.)
          Status: Resolved  (was: Patch Available)

Committed 0.94 branch and trunk.  Thanks for the patch Li and to all others who hacked on
this patch and reviewed it.
                
> 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
>             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, 4608v29.txt, 4608v30.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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