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https://issues.apache.org/jira/browse/CASSANDRA-5498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664199#comment-13664199
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Jonathan Ellis edited comment on CASSANDRA-5498 at 5/22/13 3:46 PM:
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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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