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https://issues.apache.org/jira/browse/PHOENIX-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16037869#comment-16037869
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ASF GitHub Bot commented on PHOENIX-3744:
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GitHub user akshita-malhotra opened a pull request:
https://github.com/apache/phoenix/pull/255
PHOENIX-3744 for 4.x-HBase-0.98
PHOENIX-3744 patch for 4.x-HBase-0.98 branch
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/akshita-malhotra/phoenix PHOENIX-3744-4.x
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/phoenix/pull/255.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #255
----
commit 718dfb2b11c3b57ae1dc94b79d15ada516bba4a9
Author: Akshita <[email protected]>
Date: 2017-06-05T23:49:08Z
PHOENIX-3744 for 4.x-HBase-0.98
----
> Support snapshot scanners for MR-based queries
> ----------------------------------------------
>
> Key: PHOENIX-3744
> URL: https://issues.apache.org/jira/browse/PHOENIX-3744
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: Akshita Malhotra
> Attachments: PHOENIX-3744.patch, PHOENIX-3744.patch,
> PHOENIX-3744.patch
>
>
> HBase support scanning over snapshots, with a SnapshotScanner that accesses
> the region directly in HDFS. We should make sure that Phoenix can support
> that.
> Not sure how we'd want to decide when to run a query over a snapshot. Some
> ideas:
> - if there's an SCN set (i.e. the query is running at a point in time in the
> past)
> - if the memstore is empty
> - if the query is being run at a timestamp earlier than any memstore data
> - as a config option on the table
> - as a query hint
> - based on some kind of optimizer rule (i.e. based on estimated # of bytes
> that will be scanned)
> Phoenix typically runs a query at the timestamp at which it was compiled. Any
> data committed after this time should not be seen while a query is running.
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