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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12859) Major compaction completion tracker
Date Thu, 15 Jan 2015 19:32:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14279174#comment-14279174
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Lars Hofhansl commented on HBASE-12859:
---------------------------------------

Just discussing with [~apurtell]... We can put this in the HFileContext upon file creation,
then use that to write into the HFile trailer. Lastly we can report that via RegionLoad to
the master and then query this relatively cheaply through ClusterStatus.


> 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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