class SessionQualificationParams[A <: Parameterized[A]] extends AnyRef
A collection of methods for configuring modules which help Finagle determine the health of a session. Some of these act as circuit breakers, instructing the load balancer to choose alternate paths. Effectively these enable your client to maintain higher success rates.
- A
a Stack.Parameterized client to configure
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- SessionQualificationParams
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- new SessionQualificationParams(self: Parameterized[A])
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- def consecutiveFailuresFailureAccrual(nFailures: Int): A
Sets a FailureAccrualPolicy that triggers after
nFailuresconsecutive failures.Sets a FailureAccrualPolicy that triggers after
nFailuresconsecutive failures.- nFailures
The number of failures to trigger on
- def consecutiveFailuresFailureAccrual(nFailures: Int, backoff: Backoff): A
Sets a FailureAccrualPolicy that triggers after
nFailuresconsecutive failures.Sets a FailureAccrualPolicy that triggers after
nFailuresconsecutive failures.- nFailures
The number of failures to trigger on
- backoff
The Backoff that should be applied to revival attempts
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- def noFailFast: A
Disables the Fail Fast module on this client (default: enabled).
Disables the Fail Fast module on this client (default: enabled).
The Fail Fast module is a Finagle per-session circuit breaker. It marks a host unavailable upon connection failure. The host remains dead until we successfully connect.
- Note
Usually, it's a good idea to disable Fail Fast for server sets with only one host in the load balancer's replica set.
- See also
https://twitter.github.io/finagle/guide/Clients.html#fail-fast https://twitter.github.io/finagle/guide/Clients.html#circuit-breaking FailFastFactory
- def noFailureAccrual: A
Disables the Failure Accrual module on this client (default: enabled).
Disables the Failure Accrual module on this client (default: enabled).
The Failure Accrual module is a Finagle per-request circuit breaker. It marks a host unavailable depending on the used policy. The default setup for the Failure Accrual module is to use a policy based on the number of consecutive failures (default is 5) accompanied by equal jittered backoff producing durations for which a host is marked unavailable.
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- def successRateFailureAccrual(successRate: Double, window: Duration, backoff: Backoff): A
Sets a failure accrual policy that triggers when success rate drops under a given value by looking at a moving average over a time window.
Sets a failure accrual policy that triggers when success rate drops under a given value by looking at a moving average over a time window.
The current default policy is success rate based with a cutoff of 80% and a window of 30 seconds.
- successRate
The success rate to trigger on
- window
The time window of the moving average
- backoff
The Backoff that should be applied to revival attempts
- def successRateFailureAccrual(successRate: Double, window: Duration): A
Sets a failure accrual policy that triggers when success rate drops under a given value by looking at a moving average over a time window.
Sets a failure accrual policy that triggers when success rate drops under a given value by looking at a moving average over a time window.
The current default policy is success rate based with a cutoff of 80% and a window of 30 seconds.
- successRate
The success rate to trigger on
- window
The time window of the moving average
- def successRateFailureAccrual(successRate: Double, window: Duration, backoff: Backoff, minRequestThreshold: Int): A
Sets a failure accrual policy that triggers when success rate drops under a given value by looking at a moving average over a time window.
Sets a failure accrual policy that triggers when success rate drops under a given value by looking at a moving average over a time window.
The current default policy is success rate based with a cutoff of 80% and a window of 30 seconds.
- successRate
The success rate to trigger on
- window
The time window of the moving average
- backoff
The Backoff that should be applied to revival attempts
- minRequestThreshold
The minimum number of requests in a window required for failure accrual to trigger
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