[jboss-jira] [JBoss JIRA] Closed: (JBTM-218) Contention on HashTable in com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.java

[Mark Little (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBTM-218?page=all ]

Mark Little closed JBTM-218.
----------------------------

    Fix Version/s: 4.2.3.SP3
       Resolution: Rejected

The datastructure needs to be synchronized on all accesses. A given thread may call this operation (indirectly) many times during the coure of a transaction. Given the nature of what is stored (transactions) a hash approach makes much more sense that any other structure. Hashtable versus synchronized HashMap doesn't offer significant performance benefits as far as I can see.

> Contention on HashTable in com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.java
> ---------------------------------------------------------------------------------------------------
>
>                 Key: JBTM-218
>                 URL: http://jira.jboss.com/jira/browse/JBTM-218
>             Project: JBoss Transaction Manager
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: JTA Implementation
>    Affects Versions: 4.2.3
>            Reporter: Phillip Thurmond
>         Assigned To: Mark Little
>             Fix For: 4.2.3.SP3
>
>
> I'm seeing some contention on the object _transactions in the class com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.  Most of the contention happens in the getTransaction() method.

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