Examples of com.bazaarvoice.curator.ResolvingEnsembleProvider

com.bazaarvoice.curator.ResolvingEnsembleProvider

An ensemble provider that performs DNS resolution to build the connection string. This strategy allows the connection string to adapt to changes in DNS. All resolvable hosts in the original connection string are expanded to their IP addresses. Hosts with multiple IP addresses (i.e., those with multiple A records) will result in multiple corresponding servers in the expanded connection string. The servers in the expanded connection string are sorted to produce a canonical form.

NOTE: There are two main things that could cause results that may differ from expectations.

Firstly, Java performs its own DNS caching. Cache TTLs can be configured with security properties {@code networkaddress.cache.ttl} and {@code networkaddress.cache.negative.ttl} or corresponding system properties{@code sun.net.inetaddr.ttl} and {@code sun.net.inetaddr.negative.ttl}. The default cache TTL is implementation specific, but typically 30 seconds if there is no security manager installed and infinite if there is. The default negative cache (caching nonexistence of a record) TTL is 10 seconds.

Secondly, for a consistent connection string, the DNS provider must produce all records for a hostname. Some DNS servers will only provide a subset of the records for a given hostname - for example, tinydns returns a maximum of 8 records in response to a query.

                .setNameFormat("CuratorFramework[" + _connectString + "]-%d")
                .setDaemon(true)
                .build();


        return CuratorFrameworkFactory.builder()
                .ensembleProvider(new ResolvingEnsembleProvider(_connectString.or(DEFAULT_CONNECT_STRING)))
                .retryPolicy(_setterRetryPolicy.or(_configRetryPolicy.or(DEFAULT_RETRY_POLICY)))
                .namespace(_namespace.orNull())
                .threadFactory(threadFactory)
                .build();
    }

                (_configRetryPolicy != null)
                        ? _configRetryPolicy
                        : DEFAULT_RETRY_POLICY
        );
        return CuratorFrameworkFactory.builder()
                .ensembleProvider(new ResolvingEnsembleProvider(_connectString.or(DEFAULT_CONNECT_STRING)))
                .retryPolicy(retry)
                .namespace(_namespace.orNull())
                .threadFactory(threadFactory)
                .build();
    }

Related Classes of com.bazaarvoice.curator.ResolvingEnsembleProvider

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.