[jira] Assigned: (HBASE-3083) Major compaction check should use new timestamp meta information in HFiles (rather than dfs timestamp) along with TTL to allow major even if single file

["Jonathan Gray (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Gray reassigned HBASE-3083:
------------------------------------

    Assignee: Prakash Khemani

Assigning to Prakash for now.  I will work with him on this.  Plan is to get this done this week.

> Major compaction check should use new timestamp meta information in HFiles (rather than dfs timestamp) along with TTL to allow major even if single file
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3083
>                 URL: https://issues.apache.org/jira/browse/HBASE-3083
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jonathan Gray
>            Assignee: Prakash Khemani
>             Fix For: 0.90.0
>
>
> Periodic major compactions have a separate set of checks prior to submitting the compaction request.
> Currently, if there is a single file, and it is the result of a major compaction, then it is skipped.  However, there is a check that will still allow it if the timestamp of the file is older than the TTL of that Store.
> This is not ideal because the timestamp of the file is the latest timestamp in the file rather than the oldest.  Meta information was introduced to HFiles that stores the max/min timestamp of KVs in the file.  We should use the min timestamp from that meta info rather than the file stamp itself.

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