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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4278) Implement pure client side transactional index maintenance
Date Wed, 07 Feb 2018 01:24:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354826#comment-16354826
] 

Andrew Purtell commented on PHOENIX-4278:
-----------------------------------------

HBase 1.x supports Java 8. We do require that contributions not use 8 only language features
because it has to run on Java 7 JREs. We also build 1.x with Java 7 to ensure compatibility
with 7 JREs. But 8 JREs are definitely supported with 1.x

> Implement pure client side transactional index maintenance
> ----------------------------------------------------------
>
>                 Key: PHOENIX-4278
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4278
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: James Taylor
>            Assignee: Ohad Shacham
>            Priority: Major
>
> The index maintenance for transactions follows the same model as non transactional tables
- coprocessor based on data table updates that looks up previous row value to perform maintenance.
This is necessary for non transactional tables to ensure the rows are locked so that a consistent
view may be obtained. However, for transactional tables, the time stamp oracle ensures uniqueness
of time stamps (via transaction IDs) and the filtering handles a scan seeing the "true" last
committed value for a row. Thus, there's no hard dependency to perform this on the server
side.
> Moving the index maintenance to the client side would prevent any RS->RS RPC calls
(which have proved to be troublesome for HBase). It would require returning more data to the
client (i.e. the prior row value), but this seems like a reasonable tradeoff.



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