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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10247) Client promises about timestamps
Date Fri, 27 Dec 2013 19:59:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857685#comment-13857685
] 

Lars Hofhansl commented on HBASE-10247:
---------------------------------------

[~jmhsieh], missed your earlier comment. So tables scoped... I agree. MOD_TS_OK would continue
to be the default I assume. Might want MOD_TS_ONLY, and MOD_TS_MONOTONIC (or something).

> 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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