Driver setup (version 6)
Driver setup (version 6)
Setup with default configuration, this automatically loads a properties file
arangodb.properties if exists in the classpath:
// this instance is thread-safe ArangoDB arangoDB = new ArangoDB.Builder().build();
The driver is configured with some default values:
|arangodb.timeout||connect & request timeout (millisecond)||0|
|arangodb.user||Basic Authentication User||root|
|arangodb.password||Basic Authentication Password|
|arangodb.useSsl||use SSL connection||false|
|arangodb.chunksize||VelocyStream Chunk content-size (bytes)||30000|
|arangodb.connections.max||max number of connections||1 VST, 20 HTTP|
|arangodb.protocol||used network protocol||VST|
To customize the configuration the parameters can be changed in the code…
ArangoDB arangoDB = new ArangoDB.Builder() .host("192.168.182.50", 8888) .build();
… or with a custom properties file (my.properties)
InputStream in = MyClass.class.getResourceAsStream("my.properties"); ArangoDB arangoDB = new ArangoDB.Builder() .loadProperties(in) .build();
Example for arangodb.properties:
arangodb.hosts=127.0.0.1:8529,127.0.0.1:8529 arangodb.user=root arangodb.password=
The drivers default used network protocol is the binary protocol VelocyStream
which offers the best performance within the driver. To use HTTP, you have to
set the configuration
Protocol.HTTP_JSON for HTTP with JSON
Protocol.HTTP_VPACK for HTTP with
ArangoDB arangoDB = new ArangoDB.Builder() .useProtocol(Protocol.VST) .build();
In addition to set the configuration for HTTP you have to add the apache httpclient to your classpath.
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.1</version> </dependency>
Note: If you are using ArangoDB 3.0.x you have to set the protocol to
Protocol.HTTP_JSON because it is the only one supported.
To use SSL, you have to set the configuration
true and set a
(see example code ).
ArangoDB arangoDB = new ArangoDB.Builder() .useSsl(true) .sslContext(sc) .build();
No additional configuration is required to use TLSv1.3 (if available on the server side), but a JVM that supports it is required (OpenJDK 11 or later, or distributions of Java 8 with TLSv1.3 support).
The driver supports connection pooling for VelocyStream with a default of 1 and
HTTP with a default of 20 maximum connections per host. To change this value
use the method
ArangoDB arangoDB = new ArangoDB.Builder() .maxConnections(8) .build();
The driver does not explicitly release connections. To avoid exhaustion of resources when no connection is needed, you can clear the connection pool (close all connections to the server) or use connection TTL.
Opening and closing connections very frequently can exhaust the amount of
connections allowed by the operating system. TCP connections enter a special
WAIT_TIME after close, and typically remain in this state for two
minutes (maximum segment life * 2). These connections count towards the global
limit, which depends on the operating system but is usually around 28,000.
Connections should thus be reused as much as possible.
You may run into this problem if you bypass the driver’s safe guards by setting a very high connection limit or by using multiple ArangoDB objects and thus pools.
The driver can be used concurrently by multiple threads. All the following classes are thread safe:
Any other class should not be considered thread safe. In particular classes
representing request options (package
com.arangodb.model) and response entities
com.arangodb.entity) are not thread safe.
The driver supports configuring multiple hosts. The first host is used to open a
connection to. When this host is not reachable the next host from the list is used.
To use this feature just call the method
host(String, int) multiple times.
ArangoDB arangoDB = new ArangoDB.Builder() .host("host1", 8529) .host("host2", 8529) .build();
Since version 4.3 the driver support acquiring a list of known hosts in a
cluster setup or a single server setup with followers. For this the driver has
to be able to successfully open a connection to at least one host to get the
list of hosts. Then it can use this list when fallback is needed. To use this
feature just pass
true to the method
ArangoDB arangoDB = new ArangoDB.Builder() .acquireHostList(true) .build();
Since version 4.3 the driver supports load balancing for cluster setups in two different ways.
The first one is a round robin load balancing where the driver iterates through a list of known hosts and performs every request on a different host than the request before.
ArangoDB arangoDB = new ArangoDB.Builder() .loadBalancingStrategy(LoadBalancingStrategy.ROUND_ROBIN) .build();
Just like the Fallback hosts feature the round robin load balancing strategy
can use the
acquireHostList configuration to acquire a list of all known hosts
in the cluster. Do so only requires the manually configuration of only one host.
Because this list is updated frequently it makes load balancing over the whole
cluster very comfortable.
ArangoDB arangoDB = new ArangoDB.Builder() .loadBalancingStrategy(LoadBalancingStrategy.ROUND_ROBIN) .acquireHostList(true) .build();
The second load balancing strategy allows to pick a random host from the
configured or acquired list of hosts and sticks to that host as long as the
connection is open. This strategy is useful for an application - using the driver -
which provides a session management where each session has its own instance of
ArangoDB build from a global configured list of hosts. In this case it could
be wanted that every sessions sticks with all its requests to the same host but
not all sessions should use the same host. This load balancing strategy also
works together with
ArangoDB arangoDB = new ArangoDB.Builder() .loadBalancingStrategy(LoadBalancingStrategy.ONE_RANDOM) .acquireHostList(true) .build();
In case of an Active Failover deployment the driver should be configured in the following way:
- the load balancing strategy must be either set to
LoadBalancingStrategy.NONEor not set at all, since that would be the default
acquireHostListshould be set to
ArangoDB arangoDB = new ArangoDB.Builder() .loadBalancingStrategy(LoadBalancingStrategy.NONE) .acquireHostList(true) .build();
Since version 4.4 the driver supports setting a TTL (time to life) in milliseconds for connections managed by the internal connection pool.
ArangoDB arango = new ArangoDB.Builder() .connectionTtl(5 * 60 * 1000) .build();
In this example all connections will be closed/reopened after 5 minutes.
Connection TTL can be disabled setting it to
The default TTL is
null (no automatic connection closure).
Since version 6.8 the driver supports setting keep-alive interval (in seconds) for VST connections. If set, every VST connection will perform a no-op request at the specified intervals, to avoid to be closed due to inactivity by the server (or by the external environment, e.g. firewall, intermediate routers, operating system, … ).
This option can be set using the key
in the properties file or programmatically from the driver builder:
ArangoDB arangoDB = new ArangoDB.Builder() .keepAliveInterval(1800) // 30 minutes .build();
If not set or set to
null (default), no keep-alive probes will be sent.