# ClusterMembershipOptions Properties [Type overview](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) ## DeathVoteExpirationTimeout {#deathvoteexpirationtimeout-ec1604e5} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/deathvoteexpirationtimeout-ec1604e5/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan DeathVoteExpirationTimeout ``` Gets or sets the expiration time for votes in the membership table. ### Value Votes expire after 2 minutes by default. ## DefunctSiloCleanupPeriod {#defunctsilocleanupperiod-834b9c1f} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/defunctsilocleanupperiod-834b9c1f/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan? DefunctSiloCleanupPeriod ``` Gets or sets a value indicating whether defunct silo entries older than [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) are removed. Cleanup is attempted when membership changes are observed and the current membership snapshot contains expired non-active entries, or when this period has elapsed since the last cleanup call. Set this value to `null` to disable expiration-based cleanup. ### Value Expiration-based cleanup is enabled by default. ## DefunctSiloExpiration {#defunctsiloexpiration-c3321c8a} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/defunctsiloexpiration-c3321c8a/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan DefunctSiloExpiration ``` Gets or sets the period of time after which membership entries for defunct silos are eligible for removal. Valid only if [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) is not `null`. ### Value Defunct silos are eligible for removal from membership after one week by default. ## EnableIndirectProbes {#enableindirectprobes-83756ffc} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/enableindirectprobes-83756ffc/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public bool EnableIndirectProbes ``` Gets or sets a value indicating whether to enable probing silos indirectly, via other silos. ## EvictWhenMaxJoinAttemptTimeExceeded {#evictwhenmaxjoinattempttimeexceeded-57a06798} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/evictwhenmaxjoinattempttimeexceeded-57a06798/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public bool EvictWhenMaxJoinAttemptTimeExceeded ``` Gets or sets a value indicating whether to enable membership eviction of silos when they remain in the `Joining` or `Created` state for longer than [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/). ## ExtendProbeTimeoutDuringDegradation {#extendprobetimeoutduringdegradation-c304fdaa} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/extendprobetimeoutduringdegradation-c304fdaa/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public bool ExtendProbeTimeoutDuringDegradation ``` Gets or sets a value indicating whether to extend the effective [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) value based upon current local health degradation. ## IAmAliveTablePublishTimeout {#iamalivetablepublishtimeout-d415f069} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/iamalivetablepublishtimeout-d415f069/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan IAmAliveTablePublishTimeout ``` Gets or sets the period between updating this silo's heartbeat in the membership table. ### Value Publish an update every 30 seconds by default. ## LivenessEnabled {#livenessenabled-b94786b8} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/livenessenabled-b94786b8/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public bool LivenessEnabled ``` Gets or sets a value indicating whether the silo liveness protocol is enabled (should be disabled only for testing). If a silo is suspected to be down, but this property is set to `false`, the suspicions will not be propagated to the system or enforced. This property is intended for use only for testing and troubleshooting. In production, liveness should always be enabled. ### Value Liveness is enabled by default. ## LocalHealthDegradationMonitoringPeriod {#localhealthdegradationmonitoringperiod-605e9e63} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/localhealthdegradationmonitoringperiod-605e9e63/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan LocalHealthDegradationMonitoringPeriod ``` Gets or sets the period between self-tests to log local health degradation status. ### Value The local host will perform a self-test every ten seconds by default. ## MaxDefunctSiloEntries {#maxdefunctsiloentries-a4c04120} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/maxdefunctsiloentries-a4c04120/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public int? MaxDefunctSiloEntries ``` Gets or sets the maximum number of defunct silo entries to retain in the membership table. When this limit is exceeded, the first active silo, selected by natural [SiloAddress](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.siloaddress/) sort order, asynchronously removes the oldest excess defunct entries from the membership table. Set this value to `null` to retain all defunct entries and disable threshold-based cleanup. ### Value Membership retains up to 25 defunct silo entries by default. ## MaxJoinAttemptTime {#maxjoinattempttime-e252b815} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/maxjoinattempttime-e252b815/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan MaxJoinAttemptTime ``` Gets or sets the maximum amount of time to attempt to join a cluster before giving up. ### Value Attempt to join for 5 minutes before giving up by default. ## NumMissedProbesLimit {#nummissedprobeslimit-6ead8012} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/nummissedprobeslimit-6ead8012/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public int NumMissedProbesLimit ``` Gets or sets the number of missed probe requests from a silo that lead to suspecting this silo as down. ### Value A silo will be suspected as being down if three probes are missed, by default. ## NumMissedTableIAmAliveLimit {#nummissedtableiamalivelimit-9cd1fc19} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/nummissedtableiamalivelimit-9cd1fc19/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public int NumMissedTableIAmAliveLimit ``` Gets or sets the number of missed "I am alive" updates in the table from a silo that causes warning to be logged. ## NumProbedSilos {#numprobedsilos-472e42ff} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/numprobedsilos-472e42ff/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public int NumProbedSilos ``` Gets or sets the number of silos each silo probes for liveness. ### Value Each silo will actively monitor up to 10 other silos by default. ## NumVotesForDeathDeclaration {#numvotesfordeathdeclaration-caa3cf4b} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/numvotesfordeathdeclaration-caa3cf4b/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public int NumVotesForDeathDeclaration ``` Gets or sets the number of non-expired votes that are needed to declare some silo as down (should be at most [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/)). ### Value Two votes are sufficient for a silo to be declared as down, by default. ## ProbeTimeout {#probetimeout-467af396} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/probetimeout-467af396/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan ProbeTimeout ``` Gets or sets both the period between sending a liveness probe to any given host as well as the timeout for each probe. ### Value Probes time out and a new probe is sent every 5 seconds by default. ## TableRefreshTimeout {#tablerefreshtimeout-bdb98cc3} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/tablerefreshtimeout-bdb98cc3/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public TimeSpan TableRefreshTimeout ``` Gets or sets the period between fetching updates from the membership table. ### Value The membership table is refreshed every 60 seconds by default. ## UseLivenessGossip {#uselivenessgossip-889793cd} [Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/uselivenessgossip-889793cd/) [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs) ```csharp public bool UseLivenessGossip ``` Gets or sets a value indicating whether membership updates are disseminated between hosts using gossip. ### Value Membership updates are disseminated using gossip by default.