[jira] [Updated] (HBASE-4608) HLog Compression

["Lars Hofhansl (Updated) (JIRA)" <ji...@apache.org>]

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

Lars Hofhansl updated HBASE-4608:
---------------------------------

    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.
Note that replication is currently broken when WAL compression is enabled.

  was:Adds a custom dictionary-based compression on WAL.  Off by default.  To enable, set hbase.regionserver.wal.enablecompression to true in hbase-site.xml.

    
> 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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