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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12859) Major compaction completion tracker
Date Thu, 15 Jan 2015 03:28:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278195#comment-14278195
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Gary Helmling commented on HBASE-12859:
---------------------------------------

Thanks for filing this, Lars.

Yes, this would be very useful for knowing when we can clean up invalidated transactions.

> Major compaction completion tracker
> -----------------------------------
>
>                 Key: HBASE-12859
>                 URL: https://issues.apache.org/jira/browse/HBASE-12859
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>
> In various scenarios it is helpful to know a guaranteed timestamp up to which all data
in a table was major compacted.
> We can do that keeping a major compaction timestamp in META.
> A client then can iterate all region of a table and find a definite timestamp, which
is the oldest compaction timestamp of any of the regions.
> [~apurtell], [~ghelmling], [~giacomotaylor].



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