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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5498) Possible NPE on EACH_QUORUM writes
Date Fri, 19 Apr 2013 13:57:17 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13636384#comment-13636384
] 

Jonathan Ellis commented on CASSANDRA-5498:
-------------------------------------------

I'm not convinced that we should turn an internal bug into a UAE, although I'd be fine with
an assert to make more clear what we expect.  (Pretty sure Thrift will catch it and return
an InternalError, so clients shouldn't be just left hanging.)

Separately, I note that TokenMetadata.getWriteEndpoints is ReplicationStrategy-agnostic. 
If you have any bootstrap action going on, that could be causing your problem.  (Similar bug
in CASSANDRA-5424.)
                
> 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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