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Posted to dev@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/12/27 08:29:57 UTC

[jira] [Created] (HBASE-10247) Client promises about timestamps

Lars Hofhansl created HBASE-10247:
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             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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