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From "Weiqing Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15572) Adding optional timestamp semantics to HBase-Spark
Date Fri, 08 Apr 2016 00:55:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231441#comment-15231441
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Weiqing Yang commented on HBASE-15572:
--------------------------------------

Thanks for the feedback. That’s a good idea. However, it may cause potential troubles. For
example, if a virtual column is put into the sql schema, users may have select timestamp from
table. It is a valid query in sql, but not valid in Hbase, since this timestamp is implicit
in Hbase attached to a row, there is really no such column in the Hbase row. We cannot construct
a scan using this. Thus it is an invalid query for HBase. 

> Adding optional timestamp semantics to HBase-Spark
> --------------------------------------------------
>
>                 Key: HBASE-15572
>                 URL: https://issues.apache.org/jira/browse/HBASE-15572
>             Project: HBase
>          Issue Type: New Feature
>          Components: spark
>            Reporter: Weiqing Yang
>            Assignee: Weiqing Yang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15572-1.patch, HBASE-15572-2.patch, HBASE-15572-3.patch, HBASE-15572-4.patch,
HBASE-15572-5.patch, HBASE-15572-6.patch, HBASE-15572-7.patch, HBASE-15572-8.patch
>
>
> Right now the timestamp is always latest. With this patch, users can select timestamps
they want.
> In this patch, 4 parameters, "timestamp", "minTimestamp", "maxiTimestamp" and "maxVersions"
are added to HBaseSparkConf. Users can select a timestamp, they can also select a time range
with minimum timestamp and maximum timestamp. A new test for selecting records with different
timestamps is added.



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