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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12859) New master API to track major compaction completion
Date Thu, 29 Jan 2015 22:05:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297788#comment-14297788
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Lars Hofhansl commented on HBASE-12859:
---------------------------------------

Crap... Needs a quick addendum after all. Reading back old HFile will lead to an NPE. That's
what [~stack] was asking about. I forgot to add that check.

> New master API to track major compaction completion
> ---------------------------------------------------
>
>                 Key: HBASE-12859
>                 URL: https://issues.apache.org/jira/browse/HBASE-12859
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: 12859-v1.txt, 12859-v2.txt, 12859-v3.txt, 12859-v4.txt, 12859-v5.txt,
12859-v6.txt, 12859-v7-1.1.txt, 12859-v7.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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