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From "Tellier Benoit (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAILBOX-210) A data race is possible with Cassandra UID generation
Date Wed, 21 Jan 2015 09:14:35 GMT

     [ https://issues.apache.org/jira/browse/MAILBOX-210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tellier Benoit updated MAILBOX-210:
-----------------------------------
    Attachment: fix_cassandra_uid_provider.patch

Also do conditionnal updates when UID is equal to 0.

> A data race is possible with Cassandra UID generation
> -----------------------------------------------------
>
>                 Key: MAILBOX-210
>                 URL: https://issues.apache.org/jira/browse/MAILBOX-210
>             Project: James Mailbox
>          Issue Type: Bug
>            Reporter: Tellier Benoit
>         Attachments: fix_cassandra_uid_provider.patch
>
>
> Nothing as critical as MAILBOX-209 but there is a race condition if the UID current value
is null.
> If so we set the value to one without checking if the value was updated.
> This may cause duplicated UID for UID 1, and possible message loss ( as the primary key
is the pair of the mailbox ID and the message UID ). We definitly don't want that to happen.
> Solving this bug is easy : we should also use conditionnal updates when UID is equal
to 0.



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