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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Mon, 07 Nov 2011 15:44:52 GMT

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

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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