/**
* Construct & cache an IPC client with the user-provided SocketFactory if no cached client
* exists.
*
* @param conf Configuration
* @return an IPC client
*/
private synchronized Client getClient(Configuration conf, SocketFactory factory) {
// Construct & cache client. The configuration is only used for timeout,
// and Clients have connection pools. So we can either (a) lose some
// connection pooling and leak sockets, or (b) use the same timeout for all
// configurations. Since the IPC is usually intended globally, not
// per-job, we choose (a).
Client client = clients.get(factory);
if (client == null) {
client = new Client(ObjectWritable.class, conf, factory);
clients.put(factory, client);
} else {
client.incCount();
}
return client;
}
