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From "Tyler Hobbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12311) Propagate TombstoneOverwhelmingException to the client
Date Fri, 05 Aug 2016 23:17:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15410267#comment-15410267
] 

Tyler Hobbs commented on CASSANDRA-12311:
-----------------------------------------

I've got a [python driver branch|https://github.com/thobbs/python-driver/tree/PYTHON-619-failure-map]
up that supports this.  The ticket is [PYTHON-619|https://datastax-oss.atlassian.net/browse/PYTHON-619].
I also started a [dtest branch|https://github.com/thobbs/cassandra-dtest/tree/CASSANDRA-12311-tests]
that updates the {{pushed_notifications_test}} test case mentioned above as an example.  Note
that you'll have to install the python driver from my branch in order to run this test.

> Propagate TombstoneOverwhelmingException to the client
> ------------------------------------------------------
>
>                 Key: CASSANDRA-12311
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12311
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Geoffrey Yu
>            Assignee: Geoffrey Yu
>            Priority: Minor
>              Labels: client-impacting, doc-impacting
>             Fix For: 4.x
>
>         Attachments: 12311-trunk-v2.txt, 12311-trunk-v3.txt, 12311-trunk-v4.txt, 12311-trunk-v5.txt,
12311-trunk.txt
>
>
> Right now if a data node fails to perform a read because it ran into a {{TombstoneOverwhelmingException}},
it only responds back to the coordinator node with a generic failure. Under this scheme, the
coordinator won't be able to know exactly why the request failed and subsequently the client
only gets a generic {{ReadFailureException}}. It would be useful to inform the client that
their read failed because we read too many tombstones. We should have the data nodes reply
with a failure type so the coordinator can pass this information to the client.



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