[infinispan-issues] [JBoss JIRA] (ISPN-1841) Write skew checks are performed on all entries in a transaction context

[Mircea Markus (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mircea Markus updated ISPN-1841:
--------------------------------

    Fix Version/s: 5.2.0.Alpha4
                       (was: 5.2.0.Alpha3)

    
> Write skew checks are performed on all entries in a transaction context
> -----------------------------------------------------------------------
>
>                 Key: ISPN-1841
>                 URL: https://issues.jboss.org/browse/ISPN-1841
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Manik Surtani
>            Assignee: Mircea Markus
>             Fix For: 5.2.0.Alpha4, 5.2.0.Final
>
>
> They should only be performed on entries that are read first and then updated.  The current implementation doesn't cause any problems, however it is unnecessary processing and certain transactions may unnecessarily abort if, for example, an entry is read, and not written to, but the entry changes before the transaction commits.
> From Pedro Ruivo's email to infinispan-dev, where this was reported:
> {quote}
> I've noticed that in the last version (5.1.x) the write skew check is 
> performed on all keys written. However, from your documentation [1] I 
> understood that the write skew was meant to be performed only on the 
> written keys that were previously read.
> Is this change intentional?
> Cheers,
> Pedro Ruivo
> [1] https://docs.jboss.org/author/display/ISPN51/Data+Versioning
> "Write skew checks are performed at prepare-time to ensure a concurrent 
> transaction hasn't modified an entry while it was read and potentially 
> updated based on the value read."
> {quote}

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