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Configuration properties reference

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Main Page > Configuration properties reference


1 Driver properties

Name Default value Description
jppf.discovery.broadcast.exclude.ipv4 null Prevent broadcast to the specified IPv4 addresses (exclusive filter, server only)
jppf.discovery.broadcast.exclude.ipv6 null Prevent broadcast to the specified IPv6 addresses (exclusive filter, server only)
jppf.discovery.broadcast.include.ipv4 null Broadcast to the specified IPv4 addresses (inclusive filter, server only)
jppf.discovery.broadcast.include.ipv6 null Broadcast to the specified IPv6 addresses (inclusive filter, server only)
jppf.discovery.broadcast.interval 5000 UDP broadcast interval in milliseconds
jppf.discovery.enabled true Enable/disable server discovery via UDP multicast
jppf.java.path null Full path to the Java executable
jppf.jvm.options null JVM options for the node or server process
jppf.load.balancing.algorithm proportional Load balancing algorithm name
jppf.load.balancing.persistence null Class name of the implementation of a load-balancer persistence in the driver or client, with optional parameters
jppf.load.balancing.persistence.hash SHA-1 The hash function used to generate load-balancer state identifiers
jppf.load.balancing.profile jppf Load balancing parameters profile name
jppf.local.node.bias true Whether bias towards local node for scheduling is enabled in the driver
jppf.local.node.enabled false Whether to enable a node to run in the same JVM as the driver
jppf.management.enabled true Enable/disable management of the node or server
jppf.management.server.forwarder null Fully qualifed class name of a MBeanServerForwarder implementation with optional space-separated string parameters
jppf.management.ssl.enabled false Deprecated: management is now enabled on both plain and secure connections via "jppf.management.enabled"
Enable/disable JMX via secure connections
jppf.management.ssl.port 11193 Deprecated: the secure management port is now the same as the server port given in "jppf.ssl.server.port"
Secure JMX server port
jppf.node.idle true Whether a node is idle. This property is only set within a server.
jppf.node.management.port 11198 Node management port (to distinguish from server management port when local node is on)
jppf.peer.<peer_name>.pool.size 1 Connection pool size for a manually configured peer driver connection
- peer_name: one of the names defined in 'jppf.peers'
jppf.peer.<peer_name>.recovery.enabled false Heartbeat enabled flag for a manually configured peer driver connection.
- peer_name: one of the names defined in 'jppf.peers'
jppf.peer.<peer_name>.server.host localhost Server host for a manually configured peer driver connection
- peer_name: one of the names defined in 'jppf.peers'
jppf.peer.<peer_name>.server.port 11111 Server port for a manually configured peer driver connection
- peer_name: one of the names defined in 'jppf.peers'
jppf.peer.<peer_name>.ssl.enabled false SSL enabled flag for a manually configured peer driver connection
- peer_name: one of the names defined in 'jppf.peers'
jppf.peer.allow.orphans false Whether to send jobs to orphan peer servers
jppf.peer.discovery.enabled false Enable/disable peer server discovery
jppf.peer.pool.size 1 Size of discovered peer server connection pools
jppf.peer.recovery.enabled false Heartbeat enabled flag for a discovered peer driver connection.
jppf.peer.ssl.enabled false Toggle secure connections to remote peer servers
jppf.peers null Space-separated list of peer server names
jppf.peers.load.balance.threshold Integer.MAX_VALUE The number of connected nodes below which this driver load-balances to other peer drivers
jppf.recovery.enabled false Enable/disable recovery from hardware failures through a heartbeat mechanism
jppf.recovery.max.retries 3 Maximum number of pings to the node before the connection is considered broken
jppf.recovery.read.timeout 15000 Maximum ping response time from the node
jppf.recovery.reaper.pool.size available processors Number of threads allocated to the node connection reaper
jppf.redirect.err null File to redirect System.err to
jppf.redirect.err.append false Append to existing file (true) or create a new one (false)
jppf.redirect.out null File to redirect System.out to
jppf.redirect.out.append false Append to existing file (true) or create a new one (false)
jppf.resolve.addresses true Whether to resolve IP addresses
jppf.server.exitOnShutdown true Whether to exit the JVM when shutting the driver down
jppf.server.port 11111 Server port
jppf.ssl.client.distinct.truststore false Whether to use a separate trust store for client certificates (server only)
jppf.ssl.client.truststore.file null Path to the client trust store in the file system or classpath
jppf.ssl.configuration.file null Path to the SSL configuration in the file system or classpath
jppf.ssl.configuration.source null SSL configuration as an arbitrary source
jppf.ssl.enabled false Enabled/disable secure connections
jppf.ssl.server.port 11143 Server port number for secure connections

2 Node properties

Name Default value Description
jppf.classloader.cache.size 50 Size of the class loader cache for the node
jppf.classloader.delegation parent Class loader delegation mode: 'parent' or 'url'
jppf.classloader.file.lookup true Enable/disable lookup of classpath resources in the file system
jppf.config.overrides.path config/config-overrides.properties Path to the temporary config overrides properties file
jppf.discovery.enabled true Enable/disable server discovery via UDP multicast
jppf.discovery.exclude.ipv4 null IPv4 exclusion patterns for server discovery
jppf.discovery.exclude.ipv6 null IPv6 exclusion patterns for server discovery
jppf.discovery.group 230.0.0.1 Server discovery: UDP multicast group
jppf.discovery.include.ipv4 null IPv4 inclusion patterns for server discovery
jppf.discovery.include.ipv6 null IPv6 inclusion patterns for server discovery
jppf.discovery.port 11111 Server discovery: UDP multicast port
jppf.discovery.timeout 1000 Server discovery timeout in milliseconds
jppf.idle.interruptIfRunning true Node idle mode: whether to shutdown the node at once when user activity resumes or wait until the node is no longer executing tasks
jppf.idle.mode.enabled false Enable/disable the idle mode
jppf.idle.poll.interval 1000 Node idle mode: how often the node will check for keyboard and mouse inactivity
jppf.idle.timeout 300000 Node idle mode: the time of keyboard and mouse inactivity before considering the node idle
jppf.java.path null Full path to the Java executable
jppf.jvm.options null JVM options for the node or server process
jppf.management.enabled true Enable/disable management of the node or server
jppf.management.host null Management server host
jppf.management.port 11198 Management remote connector port
jppf.management.server.forwarder null Fully qualifed class name of a MBeanServerForwarder implementation with optional space-separated string parameters
jppf.node.android false Whether the node is an Android node
jppf.node.classloading.batch.period 100 How often batched class loading requests are sent to the server
jppf.node.management.port 11198 Node management port (to distinguish from server management port when local node is on)
jppf.node.offline false Whether the node runs in offline mode
jppf.node.provisioning.master true Whether the node is a master node
jppf.node.provisioning.master.uuid null UUID of the master node for a given slave node
jppf.node.provisioning.slave false Whether the node is a slave node
jppf.node.provisioning.slave.config.path config Directory where slave-specific configuration files are located
jppf.node.provisioning.slave.id -1 Id of a slave node generated by/scoped by its master. Unique within a single master's scope. Associate with "jppf.node.provisioning.master.uuid" to provide a globally unique id.
jppf.node.provisioning.slave.jvm.options null JVM options always added to the slave startup command
jppf.node.provisioning.slave.path.prefix slave_nodes/node_ Path prefix for the root directory of slave nodes
jppf.node.provisioning.startup.overrides.file null Path to an optional config overrides file for slaves launched at startup
jppf.node.provisioning.startup.overrides.source null An optional config overrides source (name of a class implementing org.jppf.utils.JPPFConfiguration.ConfigurationSourceReader or org.jppf.utils.JPPFConfiguration.ConfigurationSource) for slaves launched at startup
jppf.node.provisioning.startup.slaves 0 Number of slaves to launch upon master node startup
jppf.policy.file null Path to the security policy file
jppf.processing.threads available processors Number of processing threads in the node
jppf.recovery.enabled false Enable/disable recovery from hardware failures through a heartbeat mechanism
jppf.redirect.err null File to redirect System.err to
jppf.redirect.err.append false Append to existing file (true) or create a new one (false)
jppf.redirect.out null File to redirect System.out to
jppf.redirect.out.append false Append to existing file (true) or create a new one (false)
jppf.resolve.addresses true Whether to resolve IP addresses
jppf.resource.cache.dir sys.property "java.io.tmpdir" Root location of the file-persisted caches
jppf.resource.cache.enabled true Whether the class loader resource cache is enabled
jppf.resource.cache.storage file Type of cache storage: either 'file' or 'memory'
jppf.server.connection.strategy null Fully qualified name of a class implementing org.jppf.node.connection.DriverConnectionStrategy
jppf.server.host localhost Server host name or IP address
jppf.server.port 11111 Server port
jppf.ssl.configuration.file null Path to the SSL configuration in the file system or classpath
jppf.ssl.configuration.source null SSL configuration as an arbitrary source
jppf.ssl.enabled false Enabled/disable secure connections
jppf.thread.manager.class default Type of thread pool to use in the node: either 'default' or 'org.jppf.server.node.fj.ThreadManagerForkJoin'

3 Node screensaver properties

Name Default value Description
jppf.screensaver.centerimage org/jppf/node/jppf@home.gif Path to the larger image at the center of the screen (built-in default screensaver)
jppf.screensaver.class null Class name of an implementation of org.jppf.node.screensaver.JPPFScreenSaver
jppf.screensaver.enabled false Enable/disable the screen saver
jppf.screensaver.fullscreen false Whether to display the screen saver in full screen mode
jppf.screensaver.handle.collisions true Handle collisions between moving logos (built-in default screensaver)
jppf.screensaver.height 800 Height in pixels (windowed mode)
jppf.screensaver.icon org/jppf/node/jppf-icon.gif Path to the image for the frame's icon (windowed mode)
jppf.screensaver.location.x 0 Screensaver's on-screen X coordinate (windowed mode)
jppf.screensaver.location.y 0 Screensaver's on-screen Y coordinate (windowed mode)
jppf.screensaver.logo.path org/jppf/node/jppf_group_small.gif Path(s) to the moving logo image(s) (built-in default screensaver)
jppf.screensaver.logos 10 Number of moving moving logos (built-in default screensaver)
jppf.screensaver.mouse.motion.close true Whether to close the screensaver on mouse motion (full screen mode)
jppf.screensaver.mouse.motion.delay 500 internal use
jppf.screensaver.node.listener null Class name of an implementation of org.jppf.node.screensaver.NodeIntegration
jppf.screensaver.speed 100 Speed of moving moving logos! from 1 to 100 (built-in default screensaver)
jppf.screensaver.status.panel.alignment center Hhorizontal alignment of the status panel (built-in default screensaver)
jppf.screensaver.title JPPF screensaver Title of the screensaver's JFrame in windowed mode
jppf.screensaver.width 1000 Width in pixels (windowed mode)

4 Client properties

Name Default value Description
<driver_name>.jppf.jmx.pool.size 1 Manually defined JMX connection ppol size for a client-to-driver connection
- driver_name: one of the driver names in 'jppf.drivers'
<driver_name>.jppf.pool.size 1 Manually defined connection ppol size for a client-to-driver connection
- driver_name: one of the driver names in 'jppf.drivers'
<driver_name>.jppf.priority 0 Manually defined priority for a client-to-driver connection
- driver_name: one of the driver names in 'jppf.drivers'
<driver_name>.jppf.recovery.enabled false Heartbeat enabled flag for a manually configured peer client connection
- driver_name: one of the driver names in 'jppf.drivers'
<driver_name>.jppf.server.host localhost Manually defined driver host for a client-to-driver connection
- driver_name: one of the driver names in 'jppf.drivers'
<driver_name>.jppf.server.port 11111 Manually defined driver port for a client-to-driver connection
- driver_name: one of the driver names in 'jppf.drivers'
<driver_name>.jppf.ssl.enabled false Manually defined SSL enabled flag for a client-to-driver connection
- driver_name: one of the driver names in 'jppf.drivers'
jppf.discovery.acceptMultipleInterfaces false Whether to discover server connections from multiple network interfaces
jppf.discovery.enabled true Enable/disable server discovery via UDP multicast
jppf.discovery.exclude.ipv4 null IPv4 exclusion patterns for server discovery
jppf.discovery.exclude.ipv6 null IPv6 exclusion patterns for server discovery
jppf.discovery.group 230.0.0.1 Server discovery: UDP multicast group
jppf.discovery.include.ipv4 null IPv4 inclusion patterns for server discovery
jppf.discovery.include.ipv6 null IPv6 inclusion patterns for server discovery
jppf.discovery.port 11111 Server discovery: UDP multicast port
jppf.discovery.priority 0 Priority assigned to discovered server connections (client/admiin console)
jppf.discovery.timeout 1000 Server discovery timeout in milliseconds
jppf.drivers default-driver Names of the manually configured servers in the client
jppf.jmx.pool.size 1 JMX connection pool size when discovery is enabled
jppf.load.balancing.algorithm proportional Load balancing algorithm name
jppf.load.balancing.persistence null Class name of the implementation of a load-balancer persistence in the driver or client, with optional parameters
jppf.load.balancing.persistence.hash SHA-1 The hash function used to generate load-balancer state identifiers
jppf.load.balancing.profile jppf Load balancing parameters profile name
jppf.local.execution.enabled false Enable/disable local execution in the client
jppf.local.execution.priority 0 Priority assigned to the client local executor
jppf.local.execution.threads available processors Maximum threads to use for local execution
jppf.pool.size 1 Connection pool size for server connections discovered via UDP multicast
jppf.recovery.enabled false Enable/disable recovery from hardware failures through a heartbeat mechanism
jppf.remote.execution.enabled true Enable/disable remote execution (client only)
jppf.resolve.addresses true Whether to resolve IP addresses
jppf.server.host localhost Server host name or IP address
jppf.server.port 11111 Server port
jppf.ssl.configuration.file null Path to the SSL configuration in the file system or classpath
jppf.ssl.configuration.source null SSL configuration as an arbitrary source
jppf.ssl.enabled false Enabled/disable secure connections

5 Desktop console properties

Name Default value Description
jppf.admin.console.view.<view_name>.addto Main The built-in view a pluggable view is attached to. It must be one of the tabbed panes of the admin console. Possible values: Main | Topology | Charts
- view_name: a user-assigned name for the view
jppf.admin.console.view.<view_name>.autoselect false Whether to automatically select the pluggable view
- view_name: a user-assigned name for the view
jppf.admin.console.view.<view_name>.class null Name of a pluggable view class, extending org.jppf.ui.plugin.PluggableView
- view_name: a user-assigned name for the view
jppf.admin.console.view.<view_name>.enabled true Enable / disable a pluggable view
- view_name: a user-assigned name for the view
jppf.admin.console.view.<view_name>.icon null Path to the icon for a pluggable view, seen as the tab icon
- view_name: a user-assigned name for the view
jppf.admin.console.view.<view_name>.position -1 The position at which a pluggable view is inserted withing the enclosing tabbed pane. A negative value means insert at the end
- view_name: a user-assigned name for the view
jppf.admin.console.view.<view_name>.title null The title for the view, seen as the tab label
- view_name: a user-assigned name for the view
jppf.ui.default.scrollbar.thickness 10 The default thickness of the scrollbars in the GUI
jppf.ui.splash true Whether to display the animated splash screen at console startup, defaults to false
jppf.ui.splash.delay 500 Interval between images in milliseconds
jppf.ui.splash.images null One or more paths to the images displayed in a rolling sequence (like a slide show), separated by '|' (pipe) characters
jppf.ui.splash.message empty string The fixed text displayed at center of the splash screen
jppf.ui.splash.message.color 64, 64, 128 The color of the fixed text displayed at center of the splash screen, as an 'r, g, b' or 'r, g, b, a' value

6 Web console properties

Name Default value Description
jppf.web.admin.refresh.interval 3 Interval in seconds between 2 refreshes of a page in the web admin console

7 Desktop and Web consoles properties

Name Default value Description
jppf.admin.refresh.interval.health 3000 Interval between updates of the JVM health data
jppf.admin.refresh.interval.stats 1000 Interval between updates of the server statistics
jppf.admin.refresh.interval.topology 1000 Interval between updates of the topology views
jppf.admin.refresh.system.info false Wether to refresh the nodes' system info as well (to use for node filtering on the client side)
jppf.gui.publish.mode immediate_notifications UI refresh mode for the job data panel: 'immediate_notifications' | 'deferred_notifications' | 'polling'
jppf.gui.publish.period 1000 Interval between updates of the job data view

8 Common properties

Name Default value Description
jppf.check.low.memory true Whether to check for low memory and trigger disk offloading
jppf.classloader.file.lookup true Enable/disable lookup of classpath resources in the file system
jppf.disk.overflow.threshold 2.0 Ratio of available heap over the size of an object to deserialize, below which disk overflow is triggered
jppf.gc.on.disk.overflow true Whether to call System.gc() and recompute the avalaible heap size before triggering disk overflow
jppf.jmxremote.protocol jppf The JMX remote protocol
jppf.length.buffer.pool.size 100 Temporary buffer pool size for reading lengths as ints (size 4)
jppf.low.memory.threshold 32 Minimum heap size in MB below which disk overflow is systematically triggered, to avoid heap fragmentation and ensure there's enough memory to deserialize job headers
jppf.notification.offload.memory.threshold 80% of max heap size Used heap in bytes above which notifications from task are offloaded to file. Defaults to 0.8 * maxHeapSize.
jppf.object.serialization.class null Serialization scheme: name of a class implementing org.jppf.serialization.JPPFSerialization
jppf.reconnect.initial.delay 0 Delay in seconds before the first (re)connection attempt
jppf.reconnect.interval 1 Frequency in seconds of reconnection attempts
jppf.reconnect.max.time 60 Time in seconds after which reconnection attempts stop. A negative value means never stop
jppf.resource.cache.dir sys.property "java.io.tmpdir" Root location of the file-persisted caches
jppf.script.default.language javascript Default script language for scripted property values
jppf.socket.buffer.size 32768 Receive/send buffer size for socket connections
jppf.socket.keepalive false Enable/disable socket keepalive
jppf.socket.max-idle -1 Seconds a socket connection can remain idle before being closed (client only)
jppf.socket.tcp_nodelay true Enable/disable Nagle's algorithm
jppf.temp.buffer.pool.size 10 Maximum size of temporary buffers pool
jppf.temp.buffer.size 32768 Size of temporary buffers used in I/O transfers

9 .Net properties

Name Default value Description
jppf.dotnet.bridge.initialized false Whether the node is .Net-enabled

10 SSL/TLS properties

Name Default value Description
jppf.ssl.cipher.suites null Space-separated enabled cipher suites
jppf.ssl.client.auth none SSL client authentication level: 'none' | 'want' | 'need'
jppf.ssl.client.distinct.truststore false Whether to use a separate trust store for client certificates (server only)
jppf.ssl.client.truststore.file null Path to the client trust store in the file system or classpath
jppf.ssl.client.truststore.password null Plain text client trust store password
jppf.ssl.client.truststore.password.source null Client trust store password as an arbitrary source
jppf.ssl.client.truststore.source null Client trust store location as an arbitrary source
jppf.ssl.client.truststore.type jks Client trust store format, e.g. 'JKS'
jppf.ssl.context.protocol TLSv1.2 javax.net.ssl.SSLContext protocol
jppf.ssl.keystore.file null Path to the key store in the file system or classpath
jppf.ssl.keystore.password null Plain text key store password
jppf.ssl.keyststore.password.source null Key store password as an arbitrary source
jppf.ssl.keyststore.type jks Key store format, e.g. 'JKS'
jppf.ssl.keytstore.source null Key store location as an arbitrary source
jppf.ssl.protocols null A list of space-separated enabled protocols
jppf.ssl.truststore.file null Path to the trust store in the file system or classpath
jppf.ssl.truststore.password null Plain text trust store password
jppf.ssl.truststore.password.source null Trust store password as an arbitrary source
jppf.ssl.truststore.source null Trust store location as an arbitrary source
jppf.ssl.truststore.type jks Trust store format, e.g. 'JKS'

11 Memory usage optimization properties

Name Default value Description
jppf.check.low.memory true Whether to check for low memory and trigger disk offloading
jppf.disk.overflow.threshold 2.0 Ratio of available heap over the size of an object to deserialize, below which disk overflow is triggered
jppf.gc.on.disk.overflow true Whether to call System.gc() and recompute the avalaible heap size before triggering disk overflow
jppf.low.memory.threshold 32 Minimum heap size in MB below which disk overflow is systematically triggered, to avoid heap fragmentation and ensure there's enough memory to deserialize job headers
jppf.notification.offload.memory.threshold 80% of max heap size Used heap in bytes above which notifications from task are offloaded to file. Defaults to 0.8 * maxHeapSize.


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