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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5498) Possible NPE on EACH_QUORUM writes
Date Wed, 22 May 2013 15:47:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664199#comment-13664199
] 

Jonathan Ellis edited comment on CASSANDRA-5498 at 5/22/13 3:46 PM:
--------------------------------------------------------------------

But I don't see how 0.7 would return an exception at all; it would just close the connection
uncleanly.
                
      was (Author: jbellis):
    But I don't see how 0.7 would return an exception; it would just close the connection
uncleanly.
                  
> Possible NPE on EACH_QUORUM writes
> ----------------------------------
>
>                 Key: CASSANDRA-5498
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5498
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.10
>            Reporter: Jason Brown
>            Assignee: Jason Brown
>            Priority: Minor
>              Labels: each_quorum, ec2
>             Fix For: 1.2.6
>
>         Attachments: 5498-v1.patch, 5498-v2.patch
>
>
> When upgrading from 1.0 to 1.1, we observed that DatacenterSyncWriteResponseHandler.assureSufficientLiveNodes()
can throw an NPE if one of the writeEndpoints has a DC that is not listed in the keyspace
while one of the nodes is down. We observed this while running in EC2, and using the Ec2Snitch.
The exception typically was was brief, but a certain segment of writes (using EACH_QUORUM)
failed during that time.
> This ticket will address the NPE in DSWRH, while a followup ticket will be created once
we get to the bottom of the incorrect DC being reported from Ec2Snitch.

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