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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-20047) consider removing txnID argument for txn stats methods
Date Wed, 04 Jul 2018 00:22:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin reassigned HIVE-20047:
---------------------------------------

    Assignee:     (was: Sergey Shelukhin)

> consider removing txnID argument for txn stats methods
> ------------------------------------------------------
>
>                 Key: HIVE-20047
>                 URL: https://issues.apache.org/jira/browse/HIVE-20047
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Sergey Shelukhin
>            Priority: Major
>
> Followup from HIVE-19975.
> W.r.t. write IDs and txn IDs, stats validity check currently verifies one of two things
- that stats write ID is valid for query write ID list, or that stats txn ID (derived from
write ID) is the same as the query txn ID.
> I'm not sure the latter check is needed; removing it would allow us to make a bunch of
APIs a little bit simpler.
> [~ekoifman] do you have any feedback? Can any stats reader (e.g. compile) observe stats
written by the same txn; but in such manner that it doesn't have the write ID of the same-txn
stats writer, in its valid write ID list? I'm assuming it's not possible, e.g. in multi statement
txn each query would have the previous same-txn writer for the same table in its valid write
ID list?



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