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From "Alan Boudreault (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7886) Coordinator should not wait for read timeouts when replicas hit Exceptions
Date Wed, 27 May 2015 21:13:43 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561753#comment-14561753
] 

Alan Boudreault commented on CASSANDRA-7886:
--------------------------------------------

marking as qa-resolve. dtest: https://github.com/riptano/cassandra-dtest/pull/301

> Coordinator should not wait for read timeouts when replicas hit Exceptions
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7886
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7886
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>         Environment: Tested with Cassandra 2.0.8
>            Reporter: Christian Spriegel
>            Assignee: Christian Spriegel
>            Priority: Minor
>              Labels: client-impacting, protocolv4, qa-resolved
>             Fix For: 2.2.0 beta 1
>
>         Attachments: 7886-final.txt, 7886_v1.txt, 7886_v2_trunk.txt, 7886_v3_trunk.txt,
7886_v4_trunk.txt, 7886_v5_trunk.txt, 7886_v6_trunk.txt
>
>
> *Issue*
> When you have TombstoneOverwhelmingExceptions occuring in queries, this will cause the
query to be simply dropped on every data-node, but no response is sent back to the coordinator.
Instead the coordinator waits for the specified read_request_timeout_in_ms.
> On the application side this can cause memory issues, since the application is waiting
for the timeout interval for every request.Therefore, if our application runs into TombstoneOverwhelmingExceptions,
then (sooner or later) our entire application cluster goes down :-(
> *Proposed solution*
> I think the data nodes should send a error message to the coordinator when they run into
a TombstoneOverwhelmingException. Then the coordinator does not have to wait for the timeout-interval.



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