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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (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
Date Tue, 05 Oct 2010 21:04:37 GMT
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
             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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