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https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229010#comment-13229010
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Lars Hofhansl commented on HBASE-4608:
--------------------------------------
@Ted: The HLog compression we're doing here is less complicated and has (far)
fewer implications on other modules compared to HBASE-4218. I don't think that
is a good comparison.
bq. LRUDictionary.class is passed to the context
You do have a point.
Maybe instead of saying
{code}
boolean compression = reader.isWALCompressionEnabled();
if (compression) {
...
{code}
it could be something like
{code}
HLogCompressionType type = reader.getCompressionType();
if (type == ...) {
...
{code}
(just made that up, but you get the idea, and should be an easy change)
@Stack: Is v27 up on RB? I looked at the earlier versions but haven't kept
track recently. I'll promise I'll do a review tomorrow. I find it a bit big to
just look at the diff.
44% space saving is pretty awesome. I forget, do we also SNAPPY/LZO/GZ compress
the HLogs?
> 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, 4608v24.txt, 4608v25.txt, 4608v27.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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