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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131888#comment-13131888
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stack commented on HBASE-4608:
------------------------------
Just to be clear, when we talk of compression, we are not talking about gzip or
the like? Such compressors compress in chunks -- e.g. 32k -- with dictionary
as preface. If a machine crashes before it flushes the current chunk, you may
lose up to the last 32k of edits. This is not the type of compression that is
being worked on here? Thanks.
> 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
>
> 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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