runtime/me.ahoo.wow.runtime.health/StoreActivity

StoreActivity

@InternalWowApi

class StoreActivity

What a node saw of one store it calls: when a call last succeeded, since when the calls fail, and how many failed lately. The node records it on every call of its event logs and lease stores (trackedLog, trackedLeases); NodeHealth reads it, so a probe never calls a store itself.

A log's call fails when it throws StorageUnavailableException or its append's outcome is AppendOutcome.Unknown (the backend's contract for an unreachable store); any other exception is a defect, not an outage, and is not counted. A lease store's call fails on any exception: the ownership retries them all as transient.

Times are System.nanoTime() values, NONE when there is none.

Types

@InternalWowApi

object Companion

Properties

var failingSince: Long

The first failure since the last success; NONE while the calls succeed.

val kind: String

What the store is to the node: LOG, LEASES, or a placed STORE instance.

var lastError: String?

The class of the last failure's exception, never its message (it may name hosts).

var lastFailure: Long

var lastSuccess: Long

val name: String

Which one: the context, and the store instance of a log group other than the default (context#store).

var probing: Long

When the probe NodeHealth runs now started; NONE when none runs.

Functions

fun failuresWithin(window: Duration): Int

The failures in the last window, counted up to MAX_RECENT.

open override fun toString(): String