[jira] [Commented] (KUDU-420) Implement HT timestamp propagation for the c++ client

["Alexey Serbin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15691752#comment-15691752 ] 

Alexey Serbin commented on KUDU-420:
------------------------------------

One of the use-cases in this context is the following:
* On impala we gather the scan tokens on the frontend and set the "last propagated timestamp" based on what we got from previous writes.
* The scan tokens need to have that information embedded so that it is set when they are inflated.
* The {{propagated_timestamp}} field from those scan tokens should make its way into appropriate setting of the corresponding scanner objects, so the participating tablet servers would adjust their clocks accordingly upon receiving scan requests if the {{propagated_timestamp}} field is set.

> Implement HT timestamp propagation for the c++ client
> -----------------------------------------------------
>
>                 Key: KUDU-420
>                 URL: https://issues.apache.org/jira/browse/KUDU-420
>             Project: Kudu
>          Issue Type: Sub-task
>          Components: tserver
>    Affects Versions: M4
>            Reporter: David Alves
>            Assignee: Alexey Serbin
>
> We're missing hybrid time timestamp propagation for the c++ client.



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