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From "Jason Brown (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-5498) Possible NPE on EACH_QUORUM writes
Date Fri, 19 Apr 2013 13:25:16 GMT


Jason Brown updated CASSANDRA-5498:

    Attachment: 5498-v1.patch

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:
>             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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