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From "Eric Charles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3729) Get cells via shell with a time range predicate
Date Wed, 06 Apr 2011 04:56:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016256#comment-13016256
] 

Eric Charles commented on HBASE-3729:
-------------------------------------

I agree that shell and client behavior must be the same.
Now the question is about the client:I can read on http://hbase.apache.org/docs/current/api/org/apache/hadoop/hbase/client/Get.html#setTimeRange%28long,%20long%29

"Get versions of columns only within the specified timestamp range, [minStamp, maxStamp)."

The Get class javadoc also says "To only retrieve columns within a specific range of version
timestamps, execute setTimeRange.".

The setMaxVersions doc says : "Get up to the specified number of versions of each column.".

>From that, I don't see how I can guess that the result further a setTimeRange is limited
by setMaxVersions...

At first sight, I find that if you don't set a maxVersion, you should simply return all results
within the time range, but that's another discussion...

To map the client, shell should thus return only 1 result if VERSIONS is not provided.
Also, the setTimeRange javadoc could be enhanced to mention the result is limited by the version
(with default = 1) (btw, I don't think it is worth I open a jira for the javadoc upgrade).

Cheers,
Eric

> Get cells via shell with a time range predicate
> -----------------------------------------------
>
>                 Key: HBASE-3729
>                 URL: https://issues.apache.org/jira/browse/HBASE-3729
>             Project: HBase
>          Issue Type: New Feature
>          Components: shell
>            Reporter: Eric Charles
>            Assignee: Ted Yu
>         Attachments: 3729-v2.txt, 3729-v3.txt, 3729-v4.txt, 3729.txt
>
>
> HBase shell allows to specify a timestamp to get a value
> - get 't1', 'r1', {COLUMN => 'c1', TIMESTAMP => ts1}
> If you don't give the exact timestamp, you get nothing... so it's difficult to get the
cell previous versions.
> It would be fine to have a "time range" predicate based get.
> The shell syntax could be (depending on technical feasibility)
> - get 't1', 'r1', {COLUMN => 'c1', TIMERANGE => (start_timestamp, end_timestamp)}

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