[
https://issues.apache.org/jira/browse/HBASE-10247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Lars Hofhansl updated HBASE-10247:
----------------------------------
Attachment: 10247.txt
*Partial* patch. Completely untested, and not even 1/3 finished. Just want to
park it here. Will probably finish it tomorrow or the day after.
So far has:
* the new table attribute
* old tables are "grandfathered in" as MIXED
* new tables default to SERVER_TS
* can be set/viewed via shell
Missing:
* nothing is enforced, yet.
* transitions are not yet restricted
* no tests, yet.
> 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
> Attachments: 10247.txt
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
