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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3533) TimeoutException when there is a firewall issue.
Date Sun, 07 Apr 2013 04:41:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624649#comment-13624649
] 

Vijay commented on CASSANDRA-3533:
----------------------------------

We do have EchoVerbHandler which gets a deserialized message from MessageDeliveryTask, we
can get around the problem by just removing the assert which was added to make sure we are
not assuming it is a echo message.... Let me know thanks!
                
> TimeoutException when there is a firewall issue.
> ------------------------------------------------
>
>                 Key: CASSANDRA-3533
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3533
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 2.0
>
>         Attachments: 0001-3533-v2.patch, 0001-CASSANDRA-3533.patch, 3533.txt
>
>
> When one node in the cluster is not able to talk to the other DC/RAC due to firewall
or network related issue (StorageProxy calls fail), and the nodes are NOT marked down because
at least one node in the cluster can talk to the other DC/RAC, we get timeoutException instead
of throwing a unavailableException.
> The problem with this:
> 1) It is hard to monitor/identify these errors.
> 2) It is hard to diffrentiate from the client if the node being bad vs a bad query.
> 3) when this issue happens we have to wait for at-least the RPC timeout time to know
that the query wont succeed.
> Possible Solution: when marking a node down we might want to check if the node is actually
alive by trying to communicate to it? So we can be sure that the node is actually alive.

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