[JBoss JIRA] Created: (ISPN-375) Enable Hot Rod clients to start transactions
by Galder Zamarreno (JIRA)
Enable Hot Rod clients to start transactions
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Key: ISPN-375
URL: https://jira.jboss.org/jira/browse/ISPN-375
Project: Infinispan
Issue Type: Feature Request
Components: Cache Server
Reporter: Galder Zamarreno
Assignee: Galder Zamarreno
Fix For: 5.1.0.BETA1, 5.1.0.Final
It might be useful to allow Hot Rod clients to start transactions within Hot Rod servers. The possibility of clients participating in the actual transaction, i.e. being an XAResource, should not be imposed since this might be less than trivial to achieve in non-Java environments. The alternative would be to allow clients to start Hot Rod server local transactions only.
This would require enhancing Hot Rod spec to have some begin/commit/rollback commands that return a tx id, and for clients to be able to send this id as part of each command that should participate in the transaction.
Pitfalls to avoid include avoiding a transaction to be propagated over several Hot Rod servers. IOW, to simplify things, if a tx is started in server A, all ops within that tx should be directed to tx. Load balancing could still happen but would need to be tx sticky.
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12 years, 1 month
[JBoss JIRA] Created: (ISPN-586) ManagedConnectionPool doesn't work in a transactional context
by Manik Surtani (JIRA)
ManagedConnectionPool doesn't work in a transactional context
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Key: ISPN-586
URL: https://jira.jboss.org/browse/ISPN-586
Project: Infinispan
Issue Type: Bug
Components: Loaders and Stores, Transactions
Affects Versions: 4.1.0.CR2
Reporter: Manik Surtani
Assignee: Manik Surtani
Fix For: 4.1.0.CR3
>From the reporter:
"Anyways, what seems to be the real problem is that all the things that need to be persisted are saved in memory and then when the transaction is completing (either in prepare or commit phase) the loader attempts to get a connection from the datasource. Apparently this is illegal and throws an exception which is what causes the HeuristicMixedException further up the chain.
This only fails when using a ManagedConnectionFactory. If I swap out a PooledConnectionFactory it works fine. I presume the managed version fails because it returns the same connection that is part of the active transaction for that thread and you can't perform new operations on that connection once the transaction is already in prepare or commit. This feels like a bit of a design flaw to me... I didn't see an obvious fix."
This possibly has to do with the AbstractCacheStore doing the following in prepare():
"
public void prepare(List<? extends Modification> mods, GlobalTransaction tx, boolean isOnePhase) throws CacheLoaderException {
if (isOnePhase) {
applyModifications(mods);
} else {
transactions.put(tx, mods);
}
}
"
and later during commit actually writing the changes to the store. This generic, "abstract" behaviour is intended for non-transactional data stores (such as a filesystem). Behaviour should be different when it comes to transactional data stores.
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12 years, 3 months
[JBoss JIRA] Created: (ISPN-701) Redesign TableManipulation in JDBC cache loader
by Trustin Lee (JIRA)
Redesign TableManipulation in JDBC cache loader
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Key: ISPN-701
URL: https://jira.jboss.org/browse/ISPN-701
Project: Infinispan
Issue Type: Task
Components: Loaders and Stores
Reporter: Trustin Lee
Assignee: Manik Surtani
Fix For: 5.0.0.BETA1, 5.0.0.Final
There are two on-going issues related with TableManipulation at the moment: ISPN-686 and ISPN-698. They both are related with vendor specific behavior, and the current implementation uses switch-cases to deal with the differences between vendors. Could we instead use inheritance to make the code look cleaner and easier to maintain? Hibernate does so:
http://viewvc.jboss.org/cgi-bin/viewvc.cgi/hibernate/core/trunk/core/src/...
Also, the properties like custom types, names, prefixes, fetch/batch sizes could be moved to AbstractJdbcCacheStoreConfig (or its subclass because we have mixed JDBC store) instead of exposing TableManipulation directly to a user.
Since Hibernate already provides very well defined dialect metadata model, we could simply tap into it. However, we should wrap it with a simple wrapper class so that a user can configure the JDBC store without the knowledge of Hibernate.
This is a backward incompatible change - will be done in 5.0, and TableManipulation and its related methods should be deprecated in 4.2.
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12 years, 7 months