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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (PHOENIX-5090) Discuss: Allow transactional writes without buffering the entire transaction on the client.
Date Sat, 05 Jan 2019 19:10:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-5090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16734982#comment-16734982
] 

Lars Hofhansl edited comment on PHOENIX-5090 at 1/5/19 7:09 PM:
----------------------------------------------------------------

[~yonigo] would it good to have ROW mode? That would reduce the conflict size and also reduce
the extra storage requirements.
(Tephra has ROW and COLUMN modes)


was (Author: lhofhansl):
[~yonigo] would it good to have ROW mode? That would reduce the conflict size and also reduce
the extra storage requirements.
(Tephra has ROW or COLUMN modes)

> Discuss: Allow transactional writes without buffering the entire transaction on the client.
> -------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-5090
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5090
>             Project: Phoenix
>          Issue Type: Wish
>            Reporter: Lars Hofhansl
>            Priority: Major
>
> Currently it is not possible execute transactions in Phoenix that are too large to be
buffered entirely on the client.
> Both Tephra and Omid support writing uncommitted data to HBase immediately and at full
speed. The client still needs to keep tracks of the rows changes for:
> # Conflict detection
> # (for Omid) writing the shadow cells
> I'd like to do some brainstorming here.
> * It should *always* be enough to only hold on to the changed rows (and columns?) only
for _conflict resolution_ and free the rest from the client as soon as the uncommitted data
is written to HBase.
> * For the shadows cells we need only keep the rows changed, right?
> * There are situations where we can avoid the client site buffering entirely (perhaps
only for Tephra) when we declare a table or upsert not to participate in conflict resolution.
> [~tdsilva], [~ohads], [~yonigo], [~jamestaylor], [~vincentpoon], more, better ideas?



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