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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228927#comment-13228927
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stack commented on HBASE-4608:
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bq. What would happen when we have a newer version for WAL_VERSION_KEY ?
You mean VERSION? You mean when new feature added? This code will change.
We'll likely have a constant for the version that introduces compression, i.e.
version 1, and we'll use it here in this expression instead (I went ahead and
added a COMPRESSION_VERSION, the version that introduced compression and will
use this new define instead).
bq. Looks like the following check should suffice for
isWALCompressionEnabled()...
Nah. Verify we have sufficient global version first, then check for the type.
Will fix other issues in next version of patch.
> 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, 4608v23.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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