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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12859) Major compaction completion tracker
Date Tue, 27 Jan 2015 16:47:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293806#comment-14293806
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Andrew Purtell commented on HBASE-12859:
----------------------------------------

v5 lgtm

In 0.98, Admin is HBaseAdmin, and is a class not an interface. It would be ok from a compatibility
standpoint to add the two new methods to it. Unfortunately HConnection is an interface marked
Public Stable, to this cannot be changed. It would be fine to add the new methods to the HConnection
implementation in HConnectionManager and call them with the necessary casting. 

> Major compaction completion tracker
> -----------------------------------
>
>                 Key: HBASE-12859
>                 URL: https://issues.apache.org/jira/browse/HBASE-12859
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>         Attachments: 12859-v1.txt, 12859-v2.txt, 12859-v3.txt, 12859-v4.txt, 12859-v5.txt,
12859-wip-UNFINISHED.txt
>
>
> 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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