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https://issues.apache.org/jira/browse/CASSANDRA-5498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13636358#comment-13636358
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Jason Brown edited comment on CASSANDRA-5498 at 4/19/13 1:25 PM:
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This patch simply checks if we got a null value from the keyspace-dc map, and
if so, throws UnavailableException.
was (Author: jasobrown):
This patch simply checks is we got a null value from the map, and if so,
throws UnavailableException.
> 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: 1.1.12, 1.2.5, 2.0
>
> Attachments: 5498-v1.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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