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https://issues.apache.org/jira/browse/HBASE-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886258#action_12886258
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HBase Review Board commented on HBASE-2793:
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Message from: "Kannan Muthukkaruppan" <[email protected]>
bq. On 2010-07-07 15:03:56, Ryan Rawson wrote:
bq. >
trunk/src/main/java/org/apache/hadoop/hbase/filter/TimestampsFilter.java, line
26
bq. > <http://review.hbase.org/r/268/diff/2/?file=2118#file2118line26>
bq. >
bq. > by default if somehow the minTimeStamp gets kept as 0 with an empty
timestamps list, then it will filter _everything out_. Do you want to set this
to 0 and instead include everything by default? Might make it easier to debug
perhaps?
bq. >
Ryan: If TimestampsFilter is used, but client passes an empty list of
timestamps, the semantics I am aiming for is indeed to filter everything out.
That's why I am setting this MAX_VALUE. The TimestampsFilter is like an IN list
predicate in SQL.
...
WHERE timestamp_col IN (t1, t2, ... t3)
If the IN list is empty, no rows should be returned.
bq. On 2010-07-07 15:03:56, Ryan Rawson wrote:
bq. >
trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java,
line 25
bq. > <http://review.hbase.org/r/268/diff/2/?file=2119#file2119line25>
bq. >
bq. > i dont think this import is necessary...
yes, my previous version of the patch needed it. I'll remove it.
bq. On 2010-07-07 15:03:56, Ryan Rawson wrote:
bq. >
trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java,
line 27
bq. > <http://review.hbase.org/r/268/diff/2/?file=2119#file2119line27>
bq. >
bq. > nor this one
ditto. Will remove.
- Kannan
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> Add ability to extract a specified list of versions of a column in a single
> roundtrip
> -------------------------------------------------------------------------------------
>
> Key: HBASE-2793
> URL: https://issues.apache.org/jira/browse/HBASE-2793
> Project: HBase
> Issue Type: New Feature
> Reporter: Kannan Muthukkaruppan
> Assignee: Kannan Muthukkaruppan
> Attachments: 2793_patch_v1.txt, 2793_patch_v2.txt
>
>
> In one of the use cases we were looking at, each row contains a single
> column, but with several versions (e.g., each version representing an event
> in a log), and we want to be able to extract specific set of versions from
> the row in a single round-trip.
> Currently, on a Get, one can retrieve a specific version of a column using
> setTimeStamp(ts) or a range of versions using setTimeRange(min, max). But not
> a set of specified versions. It would be useful to add this ability.
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