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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3048) unify code for major/minor compactions
Date Mon, 08 Nov 2010 16:16:10 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jonathan Gray updated HBASE-3048:

    Attachment: HBASE-3048-v3.patch

v3 patch is final one for commit.

> unify code for major/minor compactions
> --------------------------------------
>                 Key: HBASE-3048
>                 URL: https://issues.apache.org/jira/browse/HBASE-3048
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Amitanand Aiyer
>         Attachments: HBASE-3048-0.90-v2.patch, HBASE-3048-v3.patch, unify.patch
> Today minor compactions do not process deletes, purge old versions, etc. Only major compactions
do.  The rationale was probably to save CPU (?). We should evaluate if major compaction logic
indeed runs significantly slower.
> Unifying minor compactions to do the same thing as major compactions has other advantages:
> * If the same keys are deleted/updated repeatedly, the fact that deletes/overwrites are
not processed during minor compaction makes each subsequent minor compaction more expensive
as the total amount of data keeps growing.
> * We'll have fewer bugs if the logic is as symmetric as possible. Any bugs in TTL enforcement,
version enforcement, etc. could cause behavior to be different after a major compaction. Keeping
the same logic means these bugs will get caught earlier.
> -
> Note: There will still need to be one difference in the two schemes, and that has to
do with delete markers. Any compaction which doesn't compact all files will still need to
leave delete markers.

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