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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.application.validation.token

string

This property can be used to verify that Hazelcast members only join when their application level configuration is the same.

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 a 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.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.client.endpoint.remove.delay.seconds

60

int

Time, in seconds, after which the client connection is removed or the owner member of a client is removed from the cluster, in case of a client disconnection. Normally, the disconnection cleans all resources of a client, i.e., listeners are removed and locks/transactions are released. Using this property, the client has a window to connect back and prevent cleaning up its resources.

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.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.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.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.seconds

10

long

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

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

100

int

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

hazelcast.diagnostics.memberinfo.period.second

60

long

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

hazelcast.diagnostics.metric.level

Mandatory

string

Level of the comprehensive logs presented by the diagnostics tool related to what is happening in your Hazelcast system. Available values are Mandatory, Info and Debug.

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.seconds

10

long

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

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

33

int

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

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.executionservice.taskscheduler.remove.oncancel

false

bool

Controls whether the task scheduler removes tasks immediately upon cancellation. This is disabled by default, because it can cause severe delays on the other operations. By default all cancelled tasks are eventually get removed by the scheduler workers.

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.compatibility.3.6.client

false

bool

When this property is true, if the server cannot determine the connected client version, it assumes that it has the version 3.6.x. This property is especially needed if you are using ICache (or JCache).

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 IO error count before disconnecting from a member.

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.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.thread.count

5

int

Number of event handler threads.

hazelcast.graceful.shutdown.max.wait

600

int

Maximum wait in seconds during graceful shutdown.

hazelcast.http.healthcheck.enabled

false

bool

Enable/disable Hazelcast’s HTTP based health check implementation. When it is enabled, you can retrieve information about your cluster’s health status (member state, cluster state, cluster size, etc.) by launching http://<your member's host IP>:5701/hazelcast/health. This property is deprecated. See the Health Check and Monitoring section.

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.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.icmp.echo.fail.fast.on.startup

true

bool

Specifies whether ICMP Echo Request mode for ping detector is enforced. If OS is not supported, or not configured correctly, as explained in Requirements and Linux/Unix Configuration, Hazelcast fails to start.

hazelcast.icmp.enabled

false

bool

Specifies whether ICMP ping is enabled or not.

hazelcast.icmp.interval

1000

int

Interval between ping attempts in milliseconds. Default and minimum allowed value is 1 second.

hazelcast.icmp.max.attempts

3

int

Maximum ping attempts before suspecting a member.

hazelcast.icmp.parallel.mode

true

bool

Specifies whether Ping Failure Detector works in parallel with the other detectors.

hazelcast.icmp.timeout

1000

int

ICMP timeout in milliseconds. This cannot be more than the value of hazelcast.icmp.interval property; it should always be smaller.

hazelcast.icmp.ttl

0

int

ICMP TTL (maximum numbers of hops to try).

hazelcast.ignoreXxeProtectionFailures

false

bool

If enabled and when a problem occurs during enabling the 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, such as Xerces or Xalan, on the classpath 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.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

3

int

This is a property which is used internally and subject to change in the future releases.

hazelcast.internal.map.expiration.cleanup.percentage

10

int

This is a property which is used internally and subject to change in the future releases.

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

5

int

This is a property which is used internally and subject to change in the future releases.

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.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.jcache.provider.type

string

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

hazelcast.jmx

false

bool

Enable JMX agent.

hazelcast.legacy.memberlist.format.enabled

false

bool

Enables the legacy (for the releases before Hazelcast 3.9) member list format which is printed in the logs. The new format is introduced starting with Hazelcast 3.9 and includes member list version. Any change in the cluster, such as a member leaving or joining, increments the member list version. See the Starting the Member and Client section.

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.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

Useful to deal with some possible edge cases. For example, when using EntryProcessor, without this delay, you may see an EntryProcessor running on owner partition found a key but EntryBackupProcessor did not find it on backup. As a result of this, when backup promotes to owner, you may end up with an unprocessed key.

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.replica.wait.seconds.for.scheduled.tasks

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.master.confirmation.interval.seconds

30

int

Interval at which members send master confirmation. This property is deprecated as of this (3.10) release.

hazelcast.mastership.claim.member.list.version.increment

25

int

Hazelcast master member (oldewst in the cluster) increments the member list version for each joining member. Then, these member list versions are used to identify the joined members with unique integers. For this algorithm to work under network partitioning scenarios, without generating duplicate member list join versions for different members, a mastership-claiming member increments the member list version as specified by this parameter, multiplied by its position in the member list. The value of the parameter must be bigger than the cluster size.

hazelcast.mastership.claim.timeout.seconds

120

int

Timeout which defines when master candidate gives up waiting for response to its mastership claim. After timeout happens, non-responding member is removed from the member list.

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.no.master.confirmation.seconds

150

int

Max timeout of master confirmation from other members. This property is deprecated as of this (3.10) release.

hazelcast.max.wait.seconds.before.join

20

int

Maximum wait time before join operation.

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

10

int

Management Center maximum visible slow operations count.

hazelcast.mc.url.change.enabled

true

bool

Specifies whether the URL for Management Center is enabled. This property is deprecated. See the Using the REST Endpoint Groups section.

hazelcast.member.list.publish.interval.seconds

60

int

Interval at which master member publishes a member list.

hazelcast.memcache.enabled

false

bool

Enable Memcache client request listener service. This property is deprecated. See the Memcache Client section.

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.migration.min.delay.on.member.removed.seconds

5

int

Minimum delay (in seconds) between detection of a member that has left and start of the rebalancing process.

hazelcast.multicast.group

224.2.2.3

string

IP address of a multicast group. If not set, configuration is read from the default Hazelcast configuration, which has the value 224.2.2.3.

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.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.call.timeout.millis

60000

int

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

hazelcast.operation.generic.thread.count

-1

int

Number of generic operation handler threads. -1 means CPU core count / 2.

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

-1

int

Number of partition based operation handler threads. -1 means CPU core count.

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.replications

5

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.

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.performance.monitor.max.rolled.file.count

10

int

The PerformanceMonitor uses a rolling file approach to prevent eating too much disk space. This property sets the maximum number of rolling files to keep on disk.

hazelcast.performance.monitor.max.rolled.file.size.mb

10

int

The performance monitor uses a rolling file approach to prevent eating too much disk space. This property sets the maximum size in MB for a single file. Every HazelcastInstance gets its own history of log files.

hazelcast.performance.monitoring.enabled

bool

Enable the performance monitor, a tool which allows you to see internal performance metrics. These metrics are written to a dedicated log file.

hazelcast.performance.monitor.delay.seconds

int

The period between successive entries in the performance monitor’s log file.

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 TruePredicate 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.rest.enabled

false

bool

Enable REST client request listener service. This property is deprecated. See the Using the REST Endpoint Groups section.

hazelcast.shutdownhook.enabled

true

bool

Enables/disables Hazelcast IMDG shutdownhook thread. This property should be considered with hazelcast.shutdownhook.policy whose default value is TERMINATE; so when enabled (default behavior), 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.unsafe.mode

auto

string

"auto" (the default value) automatically detects whether the usage of Unsafe is suitable for a given platform. "disabled" explicitly disables the Unsafe usage in your platform. "enforced" enforces the usage of Unsafe even if your platform does not support it. This property can only be set by passing a JVM-wide system property.

hazelcast.phone.home.enabled

true

bool

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

hazelcast.wait.seconds.before.join

5

int

Wait time before join operation.

hazelcast.wan.map.useDeleteWhenProcessingRemoveEvents

false

bool

Configures WAN replication for IMap on the PASSIVE cluster to remove entries using delete instead of remove and when using com.hazelcast.enterprise.wan.replication.WanBatchReplication as an endpoint implementation. The member which receives the event batch in the PASSIVE cluster dispatches WAN events to the partition owners as map merge and remove operations. When using remove operations, the old entry value is sent from the partition owner to the caller even though the caller does not use the old value. This can also lead to issues if the PASSIVE cluster does not contain the class definition for the entry value as the value tries to get deserialized, causing ClassNotFoundExceptions. You can switch to using map remove instead on the PASSIVE cluster with this property. This both saves the bandwidth and avoid the exceptions.