[jira] [Commented] (KUDU-1767) Reordering of client operations from the same KuduSession is possible

["Dan Burkert (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-1767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15705950#comment-15705950 ] 

Dan Burkert commented on KUDU-1767:
-----------------------------------

Is this consistency guarantee documented?  I was not under the impression that the C++ or Java clients guaranteed this.  It really hurts parallelism to do so (only one batch can be in flight to a tablet server at once).  Additionally its not that strong of a guarantee when you consider that rows falling in separate tablets absolutely do not have this guarantee.

> Reordering of client operations from the same KuduSession is possible
> ---------------------------------------------------------------------
>
>                 Key: KUDU-1767
>                 URL: https://issues.apache.org/jira/browse/KUDU-1767
>             Project: Kudu
>          Issue Type: Bug
>          Components: client, tablet
>    Affects Versions: 1.1.0
>            Reporter: Mike Percy
>            Priority: Critical
>
> It is possible for client operations written via the same KuduSession to be reordered on the server side in MANUAL_FLUSH and AUTO_BACKGROUND_FLUSH modes. This violates our desired consistency guarantees.
> This may occur because we allow concurrent flushes from the client for throughput reasons and there is nothing enforcing the well-ordering of lock acquisition from a single client session on the server side.



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