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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145566#comment-13145566
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Todd Lipcon commented on HBASE-4608:
------------------------------------

I haven't looked at the patch yet, but it would be great if you could build a 
tool to go along with this for testing that compresses/decompresses logs. EG:

bin/hbase org.apache.hadoop.hbase.....HLogTool -compress /path/to/hlog 
/path/to/hlog.compressed
bin/hbase org.apache.hadoop.hbase.....HLogTool -uncompress 
/path/to/hlog.compressed /path/to/hlog
.. or something like that.

Then real users could see what kind of compression ratio they could expect (and 
it serves as a decent test that compress/uncompress yields the original file)
                
> 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
>
>
> 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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