Which TransactionSystemClient should I be using?

[Alan Gates]

It looks like there are several implementations of TransactionSystemClient.  The javadoc on DetachedTxSystemClient scared me, as they seemed to imply it was for situations where consistency wasn't crucial.  I don't need ZooKeeper discovery.  Do I still want TransactionServiceClient, or should I be using something else?

Alan.

[Gary Helmling]

Hi Alan,

For normal cluster operations, you would want to use TransactionServiceClient.  This is the regular distributed implementation of TransactionSystemClient.  If you really don't need ZK discovery (it's also used to handle transparent failover between active TransactionService instances), you should be able to pass null for a DiscoveryServiceClient when setting up the client instance:

Configuration conf = new Configuration();

// pass in the transaction service location

conf.set(TxConstants.Service.CFG_DATA_TX_BIND_ADDRESS, "<tx service hostname>");

// if overriding default port

conf.set(TxConstants.Service.CFG_DATA_TX_BIND_PORT, "<port>");

    

ThriftClientProvider clientProvider = new PooledClientProvider(conf, null);

TransactionServiceClient txClient = new TransactionServiceClient(conf, clientProvider);

This bypasses the use of ZK for service discovery and reads the TransactionService address from the provided configuration.

From here you can construct a TransactionContext and use that to control the transaction lifecycle.

Gary

On Tue, Mar 17, 2015 at 12:13 PM, Alan Gates <alanf...@gmail.com> wrote:

It looks like there are several implementations of TransactionSystemClient.  The javadoc on DetachedTxSystemClient scared me, as they seemed to imply it was for situations where consistency wasn't crucial.  I don't need ZooKeeper discovery.  Do I still want TransactionServiceClient, or should I be using something else?

Alan.

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