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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18642) Deprecate setting of timestamp in client for HLC
Date Thu, 24 Aug 2017 00:04:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16139354#comment-16139354
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Dave Latham commented on HBASE-18642:
-------------------------------------

We use it in multiple ways. A couple use cases first jump to mind:
- For analytics data, we have a table with date tiered compaction enabled.  We set the cell
timestamp to represent the timestamp of the data itself.  Then when we run queries on recent
data, we can pull only the HFiles with recent data on them, relying on date tiered compaction
to maintain the layout with the specified cell timestamps.
- For another case, we have certain columns where we want to maintain only the most recent
(or oldest) version of a given cell, according to a timestamp of the data itself, including
data that may arrive to our system late or out of order.  Multiple writes may regularly update
that cell, without reading it (or anything) first.  We rely on HBase to surface only the copy
with the most up to date timestamp (or oldest timestamp by inverting it via Long.MAX_VALUE
- timestamp).

> Deprecate setting of timestamp in client for HLC
> ------------------------------------------------
>
>                 Key: HBASE-18642
>                 URL: https://issues.apache.org/jira/browse/HBASE-18642
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Amit Patel
>            Assignee: Amit Patel
>            Priority: Minor
>
> With using [HBASE-14070|https://issues.apache.org/jira/browse/HBASE-14070], clients should
no longer set the timestamp for mutations (i.e., put/delete) because the server will do time
stamping instead. Therefore we should look into deprecating setTimestamp as well as other
methods that allow clients to set timestamps. 



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