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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Tue, 13 Mar 2012 04:04:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228181#comment-13228181
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Lars Hofhansl commented on HBASE-4608:
--------------------------------------

Just my $0.02 here... I think having a compression type + compression version will be hard
to grok for newcomers unfamiliar with this area, whereas having a single compression type
fields is clear. A new version of a compression algorithm is a new type (IMHO). We do not
have compression versions for the HFiles, just compression types.

I think with WAL_VERSION and compression type we have enough flexibility (HLogKey version
is really unrelated as it is for other serialization as well).

What do you think Ted?

I'll do some testing as to what the compression ratio is for a few of our scenarios tomorrow.

                
> HLog Compression
> ----------------
>
>                 Key: HBASE-4608
>                 URL: https://issues.apache.org/jira/browse/HBASE-4608
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Li Pi
>            Assignee: stack
>             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, 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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