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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-7519) Support level compaction
Date Tue, 01 Sep 2015 17:48:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14725764#comment-14725764
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Sergey Shelukhin edited comment on HBASE-7519 at 9/1/15 5:48 PM:
-----------------------------------------------------------------

It appears that this has been abandoned. Stripe compaction (which are supposed to be better
for most HBase scenarios than level) never became very popular (possibly because they are
difficult to configure), although some people use them. There are some subtle difficulties
about doing level compactions correctly in HBase (some discussed above in comments and in
the attached files), but the infrastructure for custom compactions is in place now, so if
you want to contribute, feel free.


was (Author: sershe):
It appears that this has been abandoned. Stripe compaction (which are supposed to be better
for most HBase scenarios than level) never became very popular, although some people use them.
There are some subtle difficulties about doing level compactions correctly in HBase (some
discussed above in comments and in the attached files), but the infrastructure for custom
compactions is in place now, so if you want to contribute, feel free.

> Support level compaction
> ------------------------
>
>                 Key: HBASE-7519
>                 URL: https://issues.apache.org/jira/browse/HBASE-7519
>             Project: HBase
>          Issue Type: New Feature
>          Components: Compaction
>            Reporter: Jimmy Xiang
>            Assignee: Sergey Shelukhin
>         Attachments: level-compaction.pdf, level-compactions-notes.txt, level-compactions-notes.txt
>
>
> The level compaction algorithm may help HBase for some use cases, for example, read heavy
loads (especially, just one version is used), relative small key space updated frequently.



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