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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4608) HLog Compression
Date Mon, 12 Mar 2012 22:06:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227969#comment-13227969
] 

stack commented on HBASE-4608:
------------------------------

bq. I think WAL_VERSION metadata is orthogonal to compression type metadata and I would expect
both to be present in new HLog files written with this feature.

How does it get in if you don't add it?

If you don't want to add it, just don't.  I'm not going to +1 this patch though if it adds
metadata about a new compression feature w/o introducing a general versioning on the WAL.

bq. Should the Compression class in wal package ...

The compression class in wal is Compressor.java.

I have trouble following your responses to my comments because they come in w/o context and
are also they are done piecemeal which means I have to spend way more time than I should have
to reviewing your stuff.  I'd suggest you save up your comments and submit them in a lump
rather than hit submit per comment; you'll use up less internet.
                
> 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, 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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