com.hazelcast.client.properties

Class ClientProperty

java.lang.Object

com.hazelcast.client.properties.ClientProperty

public final class ClientProperty
extends Object

Defines the name and default value for Hazelcast Client properties.

Field Summary

Fields

Modifier and Type	Field and Description
static HazelcastProperty	BACKPRESSURE_BACKOFF_TIMEOUT_MILLIS Control the maximum timeout in millis to wait for an invocation space to be available.
static HazelcastProperty	CONCURRENT_WINDOW_MS Property needed for concurrency detection so that write through and dynamic response handling can be done correctly.
static HazelcastProperty	DISCOVERY_SPI_ENABLED Enables the Discovery SPI
static HazelcastProperty	DISCOVERY_SPI_PUBLIC_IP_ENABLED Enables the Discovery Joiner to use public IP from DiscoveredNode.
static HazelcastProperty	EVENT_QUEUE_CAPACITY Capacity of the executor that handles the incoming event packets.
static HazelcastProperty	EVENT_THREAD_COUNT Number of the threads to handle the incoming event packets.
static HazelcastProperty	FAIL_ON_INDETERMINATE_OPERATION_STATE When this configuration is enabled, if an operation has sync backups and acks are not received from backup replicas in time, or the member which owns primary replica of the target partition leaves the cluster, then the invocation fails with IndeterminateOperationStateException.
static HazelcastProperty	HAZELCAST_CLOUD_DISCOVERY_TOKEN Token to use when discovering cluster via hazelcast.cloud
static HazelcastProperty	HEARTBEAT_INTERVAL Time interval between the heartbeats sent by the client to the nodes.
static HazelcastProperty	HEARTBEAT_TIMEOUT Client sends heartbeat messages to the members and this is the timeout for this sending operations.
static HazelcastProperty	INVOCATION_RETRY_PAUSE_MILLIS Pause time between each retry cycle of an invocation in milliseconds.
static HazelcastProperty	INVOCATION_TIMEOUT_SECONDS When an invocation gets an exception because : - Member throws an exception.
static HazelcastProperty	IO_BALANCER_INTERVAL_SECONDS The interval in seconds between IOBalancer executions.
static HazelcastProperty	IO_INPUT_THREAD_COUNT Controls the number of IO input threads.
static HazelcastProperty	IO_OUTPUT_THREAD_COUNT Controls the number of IO output threads.
static HazelcastProperty	IO_WRITE_THROUGH_ENABLED Optimization that allows sending of packets over the network to be done on the calling thread if the conditions are right.
static HazelcastProperty	MAX_CONCURRENT_INVOCATIONS The maximum number of concurrent invocations allowed.
static HazelcastProperty	METRICS_COLLECTION_FREQUENCY Sets the metrics collection frequency in seconds.
static HazelcastProperty	METRICS_DEBUG Enables collecting debug metrics.
static HazelcastProperty	METRICS_ENABLED Enables/disables metrics collection altogether.
static HazelcastProperty	METRICS_JMX_ENABLED Enables/disables exposing metrics on JMX.
static HazelcastProperty	OPERATION_BACKUP_TIMEOUT_MILLIS If an operation has backups, this property specifies how long the invocation will wait for acks from the backup replicas.
static HazelcastProperty	RESPONSE_THREAD_COUNT The number of response threads.
static HazelcastProperty	RESPONSE_THREAD_DYNAMIC Enabled dynamic switching between processing responses on the io threads and offloading the response threads.
static HazelcastProperty	SHUFFLE_MEMBER_LIST Client shuffles the given member list to prevent all clients to connect to the same node when this property is set to true.
static HazelcastProperty	STATISTICS_ENABLED Use to enable the client statistics collection.
static HazelcastProperty	STATISTICS_PERIOD_SECONDS The period in seconds the statistics run.

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SHUFFLE_MEMBER_LIST

public static final HazelcastProperty SHUFFLE_MEMBER_LIST

Client shuffles the given member list to prevent all clients to connect to the same node when this property is set to true. When it is set to false, the client tries to connect to the nodes in the given order.

HEARTBEAT_TIMEOUT

public static final HazelcastProperty HEARTBEAT_TIMEOUT

Client sends heartbeat messages to the members and this is the timeout for this sending operations. If there is not any message passing between the client and member within the given time via this property in milliseconds, the connection will be closed.

HEARTBEAT_INTERVAL

public static final HazelcastProperty HEARTBEAT_INTERVAL

Time interval between the heartbeats sent by the client to the nodes.

EVENT_THREAD_COUNT

public static final HazelcastProperty EVENT_THREAD_COUNT

Number of the threads to handle the incoming event packets.

EVENT_QUEUE_CAPACITY

public static final HazelcastProperty EVENT_QUEUE_CAPACITY

Capacity of the executor that handles the incoming event packets.

INVOCATION_TIMEOUT_SECONDS

public static final HazelcastProperty INVOCATION_TIMEOUT_SECONDS

When an invocation gets an exception because : - Member throws an exception. - Connection between the client and member is closed. - Client's heartbeat requests are timed out. Time passed since invocation started is compared with this property. If the time is already passed, then the exception is delegated to the user. If not, the invocation is retried. Note that, if invocation gets no exception and it is a long running one, then it will not get any exception, no matter how small this timeout is set.

INVOCATION_RETRY_PAUSE_MILLIS

public static final HazelcastProperty INVOCATION_RETRY_PAUSE_MILLIS

Pause time between each retry cycle of an invocation in milliseconds.

MAX_CONCURRENT_INVOCATIONS

public static final HazelcastProperty MAX_CONCURRENT_INVOCATIONS

The maximum number of concurrent invocations allowed.

To prevent the system from overloading, user can apply a constraint on the number of concurrent invocations. If the maximum number of concurrent invocations has been exceeded and a new invocation comes in, then hazelcast will throw HazelcastOverloadException

By default it is configured as Integer.MaxValue.

BACKPRESSURE_BACKOFF_TIMEOUT_MILLIS

public static final HazelcastProperty BACKPRESSURE_BACKOFF_TIMEOUT_MILLIS

Control the maximum timeout in millis to wait for an invocation space to be available.

If an invocation can't be made because there are too many pending invocations, then an exponential backoff is done to give the system time to deal with the backlog of invocations. This property controls how long an invocation is allowed to wait before getting a HazelcastOverloadException.

When set to -1 then HazelcastOverloadException is thrown immediately without any waiting.

DISCOVERY_SPI_ENABLED

public static final HazelcastProperty DISCOVERY_SPI_ENABLED

Enables the Discovery SPI

Discovery SPI is disabled by default

DISCOVERY_SPI_PUBLIC_IP_ENABLED

public static final HazelcastProperty DISCOVERY_SPI_PUBLIC_IP_ENABLED

Enables the Discovery Joiner to use public IP from DiscoveredNode.

Discovery SPI is disabled by default

IO_INPUT_THREAD_COUNT

public static final HazelcastProperty IO_INPUT_THREAD_COUNT

Controls the number of IO input threads. Defaults to -1, so the system will decide. If client is a smart client and processor count larger than 8, it will default to 3 otherwise it will default to 1.

IO_OUTPUT_THREAD_COUNT

public static final HazelcastProperty IO_OUTPUT_THREAD_COUNT

Controls the number of IO output threads. Defaults to -1, so the system will decide. If client is a smart client and processor count larger than 8 , it will default to 3 otherwise it will default to 1.

IO_BALANCER_INTERVAL_SECONDS

public static final HazelcastProperty IO_BALANCER_INTERVAL_SECONDS

The interval in seconds between IOBalancer executions. The shorter intervals will catch I/O Imbalance faster, but they will cause higher overhead.

Please see the documentation of IOBalancer for a detailed explanation of the problem.

The default is 20 seconds. A value smaller than 1 disables the balancer.

IO_WRITE_THROUGH_ENABLED

public static final HazelcastProperty IO_WRITE_THROUGH_ENABLED

Optimization that allows sending of packets over the network to be done on the calling thread if the conditions are right. This can reduce latency and increase performance for low threaded environments. It is enabled by default.

CONCURRENT_WINDOW_MS

public static final HazelcastProperty CONCURRENT_WINDOW_MS

Property needed for concurrency detection so that write through and dynamic response handling can be done correctly. This property sets the window the concurrency detection will signalling that concurrency has been detected, even if there are no further updates in that window. Normally in a concurrent system the window keeps sliding forward so it will always remain concurrent. Setting it too high effectively disables the optimization because once concurrency has been detected it will keep that way. Setting it too low could lead to suboptimal performance because the system will try write through and other optimizations even though the system is concurrent.

RESPONSE_THREAD_COUNT

public static final HazelcastProperty RESPONSE_THREAD_COUNT

The number of response threads. By default there are 2 response threads; this gives stable and good performance. If set to 0, the response threads are bypassed and the response handling is done on the IO threads. Under certain conditions this can give a higher throughput, but setting to 0 should be regarded an experimental feature. If set to 0, the IO_OUTPUT_THREAD_COUNT is really going to matter because the inbound thread will have more work to do. By default when TLS isn't enable, there is just 1 inbound thread.

RESPONSE_THREAD_DYNAMIC

public static final HazelcastProperty RESPONSE_THREAD_DYNAMIC

Enabled dynamic switching between processing responses on the io threads and offloading the response threads. Under certain conditions (single threaded clients) processing on the io thread can increase performance because useless handover to the response thread is removed. Also the response thread isn't created until it is needed and especially for ephemeral clients reducing threads can lead to increased performance and reduced memory usage.

HAZELCAST_CLOUD_DISCOVERY_TOKEN

public static final HazelcastProperty HAZELCAST_CLOUD_DISCOVERY_TOKEN

Token to use when discovering cluster via hazelcast.cloud

OPERATION_BACKUP_TIMEOUT_MILLIS

public static final HazelcastProperty OPERATION_BACKUP_TIMEOUT_MILLIS

If an operation has backups, this property specifies how long the invocation will wait for acks from the backup replicas. If acks are not received from some backups, there will not be any rollback on other successful replicas.

FAIL_ON_INDETERMINATE_OPERATION_STATE

public static final HazelcastProperty FAIL_ON_INDETERMINATE_OPERATION_STATE

When this configuration is enabled, if an operation has sync backups and acks are not received from backup replicas in time, or the member which owns primary replica of the target partition leaves the cluster, then the invocation fails with IndeterminateOperationStateException. However, even if the invocation fails, there will not be any rollback on other successful replicas.

STATISTICS_ENABLED

public static final HazelcastProperty STATISTICS_ENABLED

Use to enable the client statistics collection.

The default is false.

STATISTICS_PERIOD_SECONDS

public static final HazelcastProperty STATISTICS_PERIOD_SECONDS

The period in seconds the statistics run.

METRICS_ENABLED

public static final HazelcastProperty METRICS_ENABLED

Enables/disables metrics collection altogether. This is a master switch for all metrics related functionality.

NOTE: This property overrides BaseMetricsConfig.isEnabled().

Using BaseMetricsConfig.setEnabled(boolean) and the declarative counterparts are preferred over using this property. The main purpose of making metrics collection configurable from properties too is allowing operators to configure the metrics subsystem from the outside during investigation without touching or copying the configuration potentially embedded into a signed artifact.

METRICS_JMX_ENABLED

public static final HazelcastProperty METRICS_JMX_ENABLED

Enables/disables exposing metrics on JMX.

NOTE: This property overrides MetricsJmxConfig.isEnabled().

Using MetricsJmxConfig.setEnabled(boolean) and the declarative counterparts are preferred over using this property. The main purpose of making metrics collection configurable from properties too is allowing operators to configure the metrics subsystem from the outside during investigation without touching or copying the configuration potentially embedded into a signed artifact.

METRICS_DEBUG

public static final HazelcastProperty METRICS_DEBUG

Enables collecting debug metrics. Debug metrics are sent to the diagnostics only.

METRICS_COLLECTION_FREQUENCY

public static final HazelcastProperty METRICS_COLLECTION_FREQUENCY

Sets the metrics collection frequency in seconds.

NOTE: This property overrides BaseMetricsConfig.getCollectionFrequencySeconds().

Using BaseMetricsConfig.setCollectionFrequencySeconds(int) and the declarative counterparts are preferred over using this property. The main purpose of making metrics collection configurable from properties too is allowing operators to configure the metrics subsystem from the outside during investigation without touching or copying the configuration potentially embedded into a signed artifact.