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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10247) Client promises about timestamps
Date Fri, 27 Dec 2013 07:29:57 GMT
Lars Hofhansl created HBASE-10247:
-------------------------------------

             Summary: Client promises about timestamps
                 Key: HBASE-10247
                 URL: https://issues.apache.org/jira/browse/HBASE-10247
             Project: HBase
          Issue Type: Brainstorming
            Reporter: Lars Hofhansl
            Priority: Minor


This is to start a discussion about timestamp promises declared per table of CF.
For example if a client promises only monotonically increasing timestamps (or no custom set
timestamps) and VERSIONS=1, we can aggressively and easily remove old versions of the same
row/fam/col from the memstore before we flush, just by supplying a comparator that ignores
the timestamp (i.e. two KV just differing by TS would be considered equal).
That would increase the performance of counters significantly.




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