[jira] [Updated] (IGNITE-6937) SQL TX: Support SELECT FOR UPDATE

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-6937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-6937:
------------------------------------
    Component/s: sql
                 cache

> SQL TX: Support SELECT FOR UPDATE
> ---------------------------------
>
>                 Key: IGNITE-6937
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6937
>             Project: Ignite
>          Issue Type: Task
>      Security Level: Public(Viewable by anyone) 
>          Components: cache, sql
>            Reporter: Vladimir Ozerov
>             Fix For: 2.4
>
>
> Normally in SQL world readers do not block writers. This is how our SELECT operations should work by default. But we need to add a support for {{SELECT ... FOR UPDATE}} read mode, when reader obtains exclusive lock on read. 
> In this mode we lock entries as usual, but then send data back to the caller. First page can be returned directly in our {{LockResponse}}. Next pages should be requested in separate requests. With this approach {{SELECT ,,, FOR UPDATE}} will require only single round-trip to both lock and read data in case of small updates.



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