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Posted to dev@phoenix.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2019/05/08 03:43:00 UTC
[jira] [Updated] (PHOENIX-5090) Allow transactional writes without
buffering the entire transaction on the client.
[ https://issues.apache.org/jira/browse/PHOENIX-5090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Hofhansl updated PHOENIX-5090:
-----------------------------------
Summary: Allow transactional writes without buffering the entire transaction on the client. (was: Discuss: Allow transactional writes without buffering the entire transaction on the client.)
> 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
> Assignee: Lars Hofhansl
> Priority: Major
> Attachments: 5090-looksee.txt, 5090-v1.txt, 5090-v2.txt
>
>
> 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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