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

[Manik Surtani (JIRA)]

Manik Surtani created ISPN-1841:
-----------------------------------

             Summary: 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: Test Suite
            Reporter: Manik Surtani
            Assignee: Mircea Markus
             Fix For: 5.0.2.FINAL, 5.2.0.ALPHA1


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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