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System Properties

The table below lists the system properties with their descriptions in alphabetical order.

When you want to reconfigure a system property, you need to restart the members for which the property is modified.
Table 1. System Properties

Property Name

Default Value

Type

Description

hazelcast.aggregation.accumulation.parallel.evaluation

true

bool

Specifies whether to run the aggregation accumulation for multiple entries in parallel. Each Hazelcast IMDG member executes the accumulation stage of an aggregation using a single thread by default. In most cases it is useful to do it in parallel.

hazelcast.backpressure.backoff.timeout.millis

60000

int

Controls the maximum timeout in milliseconds to wait for an invocation space to be available. The value needs to be equal to or larger than 0.

hazelcast.backpressure.enabled

false

bool

Enable back pressure.

hazelcast.backpressure.max.concurrent.invocations.per.partition

100

int

The maximum number of concurrent invocations per partition.

hazelcast.backpressure.syncwindow

1000

string

Used when back pressure is enabled. The larger the sync window value, the less frequent an asynchronous backup is converted to a sync backup.

hazelcast.cache.invalidation.batch.enabled

true

bool

Specifies whether the cache invalidation event batch sending is enabled or not.

hazelcast.cache.invalidation.batch.size

100

int

Defines the maximum number of cache invalidation events to be drained and sent to the event listeners in a batch.

hazelcast.cache.invalidation.batchfrequency.seconds

5

int

Defines cache invalidation event batch sending frequency in seconds.

hazelcast.client.cleanup.period.millis

10000

int

Period, in milliseconds, to check if a client is still part of the cluster.

hazelcast.client.cleanup.timeout.millis

120000

int

Timeout duration to decide if a client is still part of the cluster. If a member cannot find any connection to a client in the cluster, it cleans up the local resources that are owned by that client.

hazelcast.client.max.no.heartbeat.seconds

300

int

Time after which the member assumes the client is dead and closes its connections to the client.

hazelcast.client.protocol.max.message.bytes

1024

int

Client protocol message size limit (in bytes) for unverified connections. I.e. maximal length of the client authentication message.

hazelcast.clientengine.blocking.thread.count

-1

int

Number of threads that the client engine has available for processing requests that are blocking, e.g., transactions. When not set, it is set as the value of core size * 20.

hazelcast.clientengine.query.thread.count

int

Number of threads to process query requests coming from the clients. Default count is the number of cores multiplied by 1.

hazelcast.clientengine.thread.count

int

Maximum number of threads to process non-partition-aware client requests, like map.size(), executor tasks, etc. Default count is the number of cores multiplied by 20.

hazelcast.connect.all.wait.seconds

120

int

Timeout to connect all other cluster members when a member is joining to a cluster.

hazelcast.connection.monitor.interval

100

int

Minimum interval in milliseconds to consider a connection error as critical.

hazelcast.connection.monitor.max.faults

3

int

Maximum I/O error count before disconnecting from a member.

hazelcast.cluster.version.auto.upgrade.enabled

false

bool

Specifies whether the automatic cluster version upgrading is enabled.

hazelcast.cluster.version.auto.upgrade.min.cluster.size

1

int

When set to a value greater than 1, automatic upgrading waits to reach that cluster size to proceed.

hazelcast.diagnostics.directory

user.dir

string

Output directory of the diagnostic log files.

For detailed information on the diagnostic tool, along with this and the following diagnostic related system properties, see the Diagnostics section.

hazelcast.concurrent.window.ms

100

int

Property needed for concurrency detection so that write through can be done correctly. This property sets the time window, in milliseconds, between the concurrency detection and its notification. Normally in a concurrent system, the window keeps sliding forward so it always remains concurrent. Setting it too high effectively disables the optimization because once a concurrency is 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.

hazelcast.diagnostics.enabled

false

bool

Specifies whether diagnostics tool is enabled or not for the cluster.

hazelcast.diagnostics.filename.prefix

string

Optional prefix for the diagnostics log file.

hazelcast.diagnostics.invocation.sample.period.seconds

0

long

Frequency of scanning all the pending invocations in seconds. 0 means the Invocations plugin for diagnostics tool is disabled.

hazelcast.diagnostics.invocation.slow.threshold.seconds

5

long

Threshold period, in seconds, that makes an invocation to be considered as slow.

hazelcast.diagnostics.max.rolled.file.count

10

int

Allowed count of diagnostic files within each roll.

hazelcast.diagnostics.max.rolled.file.size.mb

50

int

Size of each diagnostic file to be rolled.

hazelcast.diagnostics.member-heartbeat.max-deviation-percentage

100

int

Maximum allowed deviation for a member-to-member heartbeats.

hazelcast.diagnostics.member-heartbeat.seconds

10

long

Period for which the MemberHeartbeats plugin of the diagnostics tool runs. 0 means this plugin is disabled.

hazelcast.diagnostics.memberinfo.period.second

60

long

Frequency, in seconds, at which the cluster information is dumped to the diagnostics log file.

hazelcast.diagnostics.metrics.period.seconds

60

long

Frequency, in seconds, at which the Metrics plugin dumps information to the diagnostics log file.

hazelcast.diagnostics.operation-heartbeat.max-deviation-percentage

33

int

Maximum allowed deviation for a member-to-member operation heartbeats.

hazelcast.diagnostics.operation-heartbeat.seconds

10

long

Period, in seconds, for which the OperationHeartbeats plugin of the diagnostics tool runs. 0 means this plugin is disabled.

hazelcast.diagnostics.pending.invocations.period.seconds

0

long

Period, in seconds, for which the PendingInvocations plugin of the diagnostics tool runs. 0 means this plugin is disabled.

hazelcast.diagnostics.slowoperations.period.seconds

60

long

Period, in seconds, for which the SlowOperations plugin of the diagnostics tool runs. 0 means this plugin is disabled.

hazelcast.diagnostics.storeLatency.period.seconds

0

long

Period, in seconds, for which the StoreLatency plugin of the diagnostics tool runs. 0 means this plugin is disabled.

hazelcast.diagnostics.storeLatency.reset.period.seconds

0

long

Period, in seconds, for resetting the statistics for the StoreLatency plugin of the diagnostics tool.

hazelcast.diagnostics.systemlog.enabled

true

bool

Specifies whether the SystemLog plugin of the diagnostics tool is enabled or not.

hazelcast.diagnostics.systemlog.partitions

false

bool

Specifies whether the SystemLog plugin collects information about partition migrations.

hazelcast.discovery.enabled

false

bool

Enables/disables the Discovery SPI lookup over the old native implementations. See Discovery SPI for more information.

hazelcast.discovery.public.ip.enabled

false

bool

Enable use of public IP address in member discovery with Discovery SPI. If you set this property to true in your source cluster, please make sure you have set the public addresses for your target members since they will be discovered using their public addresses. Otherwise, they cannot be discovered. See the Public Address section.

hazelcast.dynamicconfig.ignore.conflicts

bool

When it is set to true, IMDG does not check if the added dynamic configuration conflicts with an existing dynamic configuration. Existing dynamic configuration is not replaced. Note that, this property is not meant to ignore the conflicts between static configuration and dynamic configuration. If the added dynamic configuration exists in the static configuration of the member, it will throw an exception regardless this property.

hazelcast.enterprise.license.key

null

string

hazelcast.event.queue.capacity

1000000

int

Capacity of internal event queue.

hazelcast.event.queue.timeout.millis

250

int

Timeout to enqueue events to event queue.

hazelcast.event.sync.timeout.millis

5000

int

To prevent overloading of the outbound connections, once in a while an event is made synchronous by wrapping it in a dummy operation and waiting for a dummy response. This causes the outbound write queue of the connection to get drained. This timeout configures the maximum amount of waiting time for this response. Setting it to a too low value can lead to an uncontrolled growth of the outbound write queue of the connection.

hazelcast.event.thread.count

5

int

Number of event handler threads.

hazelcast.graceful.shutdown.max.wait

600

int

Maximum wait in seconds during graceful shutdown.

hazelcast.hd.global.index.enabled

true

bool

Specifies whether the global concurrent High-Density Memory Store indexes are enabled or not.

hazelcast.health.monitoring.delay.seconds

30

int

Health monitoring logging interval in seconds. NOTE: For detailed information on the health monitoring tool, along with this and the following health monitoring related system properties, see the Health Check and Monitoring section.

hazelcast.health.monitoring.level

SILENT

string

Health monitoring log level. When SILENT, logs are printed only when values exceed some predefined threshold. When NOISY, logs are always printed periodically. Set OFF to turn off completely.

hazelcast.health.monitoring.threshold.cpu.percentage

70

int

When the health monitoring level is SILENT, logs are printed only when the CPU usage exceeds this threshold.

hazelcast.health.monitoring.threshold.memory.percentage

70

int

When the health monitoring level is SILENT, logs are printed only when the memory usage exceeds this threshold.

hazelcast.heartbeat.failuredetector.type

deadline

string

Type of the heartbeat failure detector. See the Failure Detector Configuration section.

hazelcast.heartbeat.interval.seconds

5

int

Heartbeat send interval in seconds.

hazelcast.hidensity.check.freememory

true

bool

If enabled and is able to fetch memory statistics via Java’s OperatingSystemMXBean, it checks whether there is enough free physical memory for the requested number of bytes. If the free memory checker is disabled (false), acts as if the check is succeeded.

hazelcast.hotrestart.free.native.memory.percentage

15

long

Percentage of the free memory space that is required by a hot restart.

hazelcast.ignoreXxeProtectionFailures

false

bool

If enabled and when a problem occurs during enabling XML External Entity (XXE) protection, then the problem is ignored and only a warning message is logged.

This property should only be used as a last resort. Hazelcast uses the XXE protection by setting respective XML processor properties. These properties are supported in modern XML processors, e.g., the default one available in Java. An old processor on the classpath, such as Xerces and Xalan, may miss the support and throw an exception during enabling the XXE protection. Setting this system property to true allows ignoring such exceptions.

hazelcast.index.copy.behavior

COPY_ON_READ

string

Defines the behavior for index copying on index read/write. See the Copying Indexes section.

hazelcast.init.cluster.version

string

Used to override the cluster version to use while an IMDG instance is not member of a cluster yet. The cluster version assumed before joining a cluster may affect the serialization format of the cluster discovery. The default is to use the member’s codebase version. You may need to override it for your member to join a cluster running on a previous cluster version.

hazelcast.initial.min.cluster.size

0

int

Initial expected cluster size to wait before member to start completely.

hazelcast.initial.wait.seconds

0

int

Initial time in seconds to wait before member to start completely.

hazelcast.internal.map.expiration.cleanup.operation.count

N/A

int

Count of scannable partitions in each run of the background expiration task. No default value exists. It is dynamically calculated against the partition count or partition thread count.

hazelcast.internal.map.expiration.cleanup.percentage

10

int

Scannable percentage of the entries in the maps' partitions in each run of the background expiration task.

hazelcast.internal.map.expiration.task.period.seconds

5

int

Interval, in seconds, at which the background expiration task is going to run.

hazelcast.invalidation.max.tolerated.miss.count

10

int

If missed invalidation count is bigger than this value, relevant cached data is made unreachable.

hazelcast.invalidation.reconciliation.interval.seconds

60

int

Period for which the cluster members are scanned to compare generated invalidation events with the received ones from Near Cache.

hazelcast.invocation.max.retry.count

int

Maximum number of retries for an invocation. After threshold is reached, the invocation is assumed as failed.

hazelcast.invocation.retry.pause.millis

int

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

hazelcast.io.balancer.interval.seconds

20

int

Interval in seconds between IOBalancer executions.

hazelcast.io.input.thread.count

3

int

Number of socket input threads.

hazelcast.io.output.thread.count

3

int

Number of socket output threads.

hazelcast.io.thread.count

3

int

Number of threads performing socket input and socket output. If, for example, the default value (3) is used, it means there are 3 threads performing input and 3 threads performing output (6 threads in total).

hazelcast.io.write.through

true

bool

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

hazelcast.jcache.provider.type

string

Type of the JCache provider. Values can be client or server.

hazelcast.jmx

false

bool

Enable JMX agent.

hazelcast.local.localAddress

string

It is an overrider property for the default server socket listener’s IP address. If this property is set, then this is the address where the server socket is bound to.

hazelcast.local.publicAddress

string

It is an overrider property for the default public address to be advertised to other cluster members and clients.

hazelcast.lock.max.lease.time.seconds

Long.MAX_VALUE

long

All locks which are acquired without an explicit lease time use this value (in seconds) as the lease time. When you want to set an explicit lease time for your locks, you cannot set it to a longer time than this value.

hazelcast.logging.details.enabled

true

bool

Specifies whether the cluster name, IP and version should be included in all log messages.

hazelcast.logging.type

jdk

enum

Name of logging framework type to send logging events.

hazelcast.map.entry.filtering.natural.event.types

false

bool

Notify entry listeners with predicates on map entry updates with events that match entry, update or exit from predicate value space.

hazelcast.map.expiry.delay.seconds

10

int

Delays expiration of backup map entries by the defined amount. This may be useful to prevent some cases where an entry might be observed on the primary replica (partition owner) but not on the backup replica. For instance, when running an entry processor on both primary and backup replicas.

hazelcast.map.eviction.batch.size

1

int

Maximum number of IMap entries Hazelcast will evict during a single eviction cycle. Eviction cycle is triggered by a map mutation. Typically it is fine to evict at most a single entry. However, when you insert values in a loop, each iteration doubles the entry size. In this situation more than just a single entry should be evicted.

hazelcast.map.eviction.sample.count

15

int

Count of the IMap entries in the entry set formed by random samplings from which Hazelcast chooses to remove the optimal entry during an IMap eviction.

hazelcast.map.invalidation.batchfrequency.seconds

10

int

If the collected invalidations do not reach the configured batch size, a background process sends them at this interval.

hazelcast.map.invalidation.batch.enabled

true

bool

Enable or disable batching. When it is set to false, all invalidations are sent immediately.

hazelcast.map.invalidation.batch.size

100

int

Maximum number of invalidations in a batch.

hazelcast.map.load.chunk.size

1000

int

Maximum size of the key batch sent to the partition owners for value loading and the maximum size of a key batch for which values are loaded in a single partition.

hazelcast.map.loaded.key.limit.per.node

50000

int

Maximum number of keys read into memory at a time. This is a per-member limit to prevent OutOfMemoryError when multiple maps are tried to load concurrently from the same member.

hazelcast.map.replica.scheduled.task.delay.seconds

10

int

Scheduler delay for map tasks those are executed on backup members.

hazelcast.map.write.behind.queue.capacity

50000

string

Maximum write-behind queue capacity per member. It is the total of all write-behind queue sizes in a member including backups. Its maximum value is Integer.MAX_VALUE. The value of this property is taken into account only if the write-coalescing element of the Map Store configuration is false. See here for the description of the write-coalescing element.

hazelcast.max.join.merge.target.seconds

20

int

Split-brain merge timeout for a specific target.

hazelcast.max.join.seconds

300

int

Join timeout, maximum time to try to join before giving.

hazelcast.max.no.heartbeat.seconds

60

int

Maximum timeout of heartbeat in seconds for a member to assume it is dead.

Setting this value too low may cause members to be evicted from the cluster when they are under heavy load: they will be unable to send heartbeat operations in time, so other members will assume that it is dead.

hazelcast.max.wait.seconds.before.join

20

int

Maximum wait time before join operation. This is an upper limit on the cluster’s pre-join phase duration. The pre-join phase starts when the master receives the first join request, and ends after no new members have tried to join for hazelcast.wait.seconds.before.join seconds, or after this upper limit elapsed (whichever comes first). Once the pre-join phase ends, the master moves into the join phase, during which it will only admit members that have already tried joining during the pre-join phase and are still trying to. Once the join phase is complete, the master will again start admitting new members.

hazelcast.mc.executor.thread.count

int

2

Number of threads that the Management Center service has available for processing the operations sent from the connected Management Center instance.

hazelcast.mc.max.visible.slow.operations.count

10

int

Management Center maximum visible slow operations count.

hazelcast.member.list.publish.interval.seconds

60

int

Interval at which master member publishes a member list.

hazelcast.member.naming.moby.enabled

true

bool

Defines whether the Moby naming should be used for generating instance names when they are not provided by user. Moby name is a short human-readable name consisting of a randomly chosen adjective and the surname of a famous person. If set to true, a Moby name is generated. Otherwise, a name that is concatenation of a static prefix, number and cluster name is provided.

hazelcast.merge.first.run.delay.seconds

300

int

Initial run delay of split-brain/merge process in seconds.

hazelcast.merge.next.run.delay.seconds

120

int

Run interval of split-brain/merge process in seconds.

hazelcast.metrics.collection.frequency

5

int

Frequency, in seconds, of the metrics collection cycle. Note that the preferred way for controlling this setting is Metrics Configuration.

hazelcast.metrics.datastructures.enabled

true

bool

Specifies whether collecting metrics from the distributed data structures is enabled.

hazelcast.metrics.debug.enabled

false

bool

Enables collecting debug metrics if set to true, disables it otherwise. Note that this is meant to be enabled only if diagnostics feature is enabled, since currently only this feature consumes the debug metrics.

hazelcast.metrics.enabled

true

bool

Enables the metrics collection if set to true, disables it otherwise. Note that the preferred way for controlling this setting is Metrics Configuration.

hazelcast.metrics.mc.enabled

true

bool

Enables buffering the collected metrics for Management Center if set to true, disables it otherwise. Note that the preferred way for controlling this setting is Metrics Configuration.

hazelcast.metrics.mc.retention

5

int

Duration, in seconds, that the metrics are retained for Management Center. Note that the preferred way for controlling this setting is Metrics Configuration.

hazelcast.metrics.jmx.enabled

true

bool

Enables exposing the collected metrics over JMX if set to true, disables it otherwise. Note that the preferred way for controlling this setting is Metrics Configuration.

hazelcast.network.stats.refresh.interval.seconds

3

int

Interval, in seconds, at which the network statistics (bytes sent and received) are re-calculated and published. It is valid only when advanced networking is used.

hazelcast.nio.tcp.spoofing.checks

false

bool

Controls whether more strict checks upon BIND requests towards a cluster member are applied. The checks mainly validate the remote BIND request against the remote address as found in the socket. By default they are disabled, to avoid connectivity issues when deployed under NAT’ed infrastructure.

hazelcast.operation.backup.timeout.millis

5000

int

Maximum time a caller to wait for backup responses of an operation. After this timeout, operation response is returned to the caller even no backup response is received.

hazelcast.operation.call.timeout.millis

60000

int

Timeout to wait for a response when a remote call is sent, in milliseconds.

hazelcast.operation.fail.on.indeterminate.state

false

bool

When enabled, an operation fails with IndeterminateOperationStateException, if it does not receive backup acks in time with respect to backup configuration of its data structure, or the member which owns primary replica of the target partition leaves the cluster.

hazelcast.operation.generic.thread.count

2

int

Number of generic operation handler threads for each Hazelcast member. Its default value is the maximum of 2 and processor count / 2.

hazelcast.operation.priority.generic.thread.count

1

int

Number of priority generic operation handler threads per member. Having at least 1 priority generic operation thread helps to improve cluster stability since a lot of cluster operations are generic priority operations and they should get executed as soon as possible. If there is a dedicated generic operation thread then these operations don’t get delayed because the generic threads are busy executing regular user operations. So unless memory consumption is an issue, make sure there is at least 1 thread.

hazelcast.operation.response.thread.count

2

int

Number of threads the process responses. The default value 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.

hazelcast.operation.responsequeue.idlestrategy

block

string

Specifies whether the response thread for internal operations on the member side are blocked or not. If you use block (the default value) the thread is blocked and need to be notified which can cause a reduction in the performance. If you use backoff there is no blocking. By enabling the backoff mode and depending on your use case, you can get a 5-10% performance improvement. However, keep in mind that this increases the CPU utilization. We recommend you to use backoff with care and if you have a tool for measuring your cluster’s performance.

hazelcast.operation.thread.count

2

int

Number of partition based operation handler threads for each Hazelcast member. Its default value is the maximum of 2 and count of available processors.

hazelcast.partial.member.disconnection.resolution.algorithm.timeout.seconds

5

int

Timeout, in seconds, to stop the execution of resolution algorithm when needed, in the case of lots of possible random network disconnections especially in the large clusters.

hazelcast.partial.member.disconnection.resolution.heartbeat.count

0

int

When the master (oldest member in the cluster) receives a heartbeat problem report from another member, it first waits for a number of heartbeat rounds to allow other members to report their problems, if there is any. This property sets the number of these rounds.

hazelcast.partition.backup.sync.interval

30

int

Interval for syncing backup replicas in seconds.

hazelcast.partition.count

271

int

Total partition count.

hazelcast.partition.max.parallel.migrations

10

int

Maximum number of partition migrations to be executed concurrently on a member. Member can be either source or target of the migration. Having too much parallelization can increase the heap memory usage and overload the network during a partition rebalance. Having less parallelization can increase the total migration completion time. The default value, 10, is fine for most of the setups.

hazelcast.partition.max.parallel.replications

10

int

Maximum number of parallel partition backup replication operations per member. When a partition backup ownership changes or a backup inconsistency is detected, the members start to sync their backup partitions. This parameter limits the maximum running replication operations in parallel. The default value, which is the value of hazelcast.partition.max.parallel.migrations, is fine for most of the setups.

hazelcast.partition.migration.fragments.enabled

true

bool

When enabled, which is the default behavior, partitions are migrated/replicated in small fragments instead of one big chunk. Migrating partitions in fragments reduces pressure on the memory and network since smaller packets are created in the memory and sent through the network. Note that it can increase the migration time to complete.

hazelcast.partition.migration.interval

0

int

Interval to run partition migration tasks in seconds.

hazelcast.partition.migration.stale.read.disabled

false

bool

Hazelcast allows read operations to be performed while a partition is being migrated. This can lead to stale reads for some scenarios. You can disable stale read operations by setting this system property’s value to "true". Its default value is "false", meaning that stale reads are allowed.

hazelcast.partition.migration.timeout

300

int

Timeout for partition migration tasks in seconds.

hazelcast.partition.table.send.interval

15

int

Interval for publishing partition table periodically to all cluster members in seconds.

hazelcast.partitioning.strategy.class

null

string

Class name implementing com.hazelcast.core.PartitioningStrategy, which defines key to partition mapping.

hazelcast.phone.home.enabled

true

bool

Enable or disable the sending of phone home data to Hazelcast’s phone home server.

hazelcast.prefer.ipv4.stack

true

bool

Prefer IPv4 network interface when picking a local address.

hazelcast.query.max.local.partition.limit.for.precheck

3

int

Maximum value of local partitions to trigger local pre-check for Predicates#alwaysTrue() query operations on maps.

hazelcast.query.optimizer.type

RULES

String

Type of the query optimizer. For optimizations based on static rules, set the value to RULES. To disable the optimization, set the value to NONE.

hazelcast.query.predicate.parallel.evaluation

false

bool

Each Hazelcast member evaluates query predicates using a single thread by default. In most cases, the overhead of inter-thread communications overweight can benefit from parallel execution. When you have a large dataset and/or slow predicate, you may benefit from parallel predicate evaluations. Set to true if you are using slow predicates or have > 100,000s entries per member.

hazelcast.query.result.size.limit

-1

int

Result size limit for query operations on maps. This value defines the maximum number of returned elements for a single query result. If a query exceeds this number of elements, a QueryResultSizeExceededException is thrown. Its default value is -1, meaning it is disabled.

hazelcast.serialization.version

long

Version of the Hazelcast serialization. Accepted values are between 1 and the highest supported serialization version.

hazelcast.shutdownhook.enabled

true

bool

Enables/disables Hazelcast IMDG shutdownhook thread. When it is disabled, this thread terminates the Hazelcast instance without waiting to shutdown gracefully.

hazelcast.shutdownhook.policy

TERMINATE

string

Specifies the behavior when JVM is exiting while the Hazelcast instance is still running. It has two values: TERMINATE and GRACEFUL. The former one terminates the Hazelcast instance immediately. The latter, GRACEFUL, initiates the graceful shutdown which can significantly slow down the JVM exit process, but it tries to retain data safety. Note that you should always shutdown Hazelcast explicitly via using the method HazelcastInstance.shutdown(). It’s not recommended to rely on the shutdown hook, this is a last-effort measure.

hazelcast.slow.operation.detector.enabled

true

bool

Enables/disables the SlowOperationDetector.

hazelcast.slow.operation.detector.log.purge.interval.seconds

300

int

Purge interval for slow operation logs.

hazelcast.slow.operation.detector.log.retention.seconds

3600

int

Defines the retention time of invocations in slow operation logs. If an invocation is older than this value, it is purged from the log to prevent unlimited memory usage. When all invocations are purged from a log, the log itself is deleted.

hazelcast.slow.operation.detector.stacktrace.logging.enabled

false

bool

Defines if the stacktraces of slow operations are logged in the log file. Stack traces are always reported to the Management Center, but by default, they are not printed to keep the log size small.

hazelcast.slow.operation.detector.threshold.millis

10000

int

Defines a threshold above which a running operation in OperationService is considered to be slow. These operations log a warning and are shown in the Management Center with detailed information, e.g., stacktrace.

hazelcast.socket.bind.any

true

bool

Bind both server-socket and client-sockets to any local interface.

hazelcast.socket.buffer.direct

false

bool

Specifies whether the byte buffers used in the socket should be a direct byte buffer (true) or a regular one (false). When it is set to true, Hazelcast internally uses the method ByteBuffer.allocateDirect (instead of ByteBuffer.allocate) which makes use of the off-heap and may skip the memory copying when performing socket I/O operations. See here for more information.

hazelcast.socket.client.bind

true

bool

Bind client socket to an interface when connecting to a remote server socket. When set to false, client socket is not bound to any interface.

hazelcast.socket.client.bind.any

true

bool

Bind client-sockets to any local interface. If not set, hazelcast.socket.bind.any is used as the default.

hazelcast.socket.client.receive.buffer.size

-1

int

Hazelcast creates all connections with receive buffer size set according to the hazelcast.socket.receive.buffer.size. When it detects a connection opened by a client, then it adjusts the receive buffer size according to this property. It is in kilobytes and its default value is -1.

hazelcast.socket.client.send.buffer.size

-1

int

Hazelcast creates all connections with send buffer size set according to the hazelcast.socket.send.buffer.size. When it detects a connection opened by a client, then it adjusts the send buffer size according to this property. It is in kilobytes and its default value is -1.

hazelcast.socket.connect.timeout.seconds

0

int

Socket connection timeout in seconds. Socket.connect() is blocked until either connection is established or connection is refused or this timeout passes. Default is 0, means infinite.

hazelcast.socket.keep.alive

true

bool

Socket set keep alive (SO_KEEPALIVE).

hazelcast.socket.linger.seconds

0

int

Set socket SO_LINGER option.

hazelcast.socket.no.delay

true

bool

Socket set TCP no delay.

hazelcast.socket.receive.buffer.size

128

int

Socket receive buffer (SO_RCVBUF) size in KB. If you have a very fast network, e.g., 10gbit) and/or you have large entries, then you may benefit from increasing sender/receiver buffer sizes. Use this property and the next one below tune the size.

hazelcast.socket.send.buffer.size

128

int

Socket send buffer (SO_SNDBUF) size in KB.

hazelcast.socket.server.bind.any

true

bool

Bind server-socket to any local interface. If not set, hazelcast.socket.bind.any is used as the default.

hazelcast.tcp.join.port.try.count

3

int

The number of incremental ports, starting with the port number defined in the network configuration, that is used to connect to a host (which is defined without a port in TCP/IP member list while a member is searching for a cluster).

hazelcast.wait.seconds.before.join

5

int

Wait time before join operation. This time establishes a pre-join phase time window for newcomer members to make their first join requests. Once hazelcast.wait.seconds.before.join elapses since the last first-timer join request (i.e., where the member hasn’t made any previous join request), or the pre-join phase has lasted for hazelcast.max.wait.seconds.before.join seconds, the phase ends and the master starts forming the cluster.