common-streams 0.10.0

Common streams 0.10.0 brings significant to changes to the Kinesis and
Pubsub sources:

- PubSub source completely re-written to be a wrapper around UnaryPull
  snowplow-incubator/common-streams#101
- Kinesis source is more efficient when the stream is re-sharded
  snowplow-incubator/common-streams#102
- Kinesis source better tuned for larger deployments
  snowplow-incubator/common-streams#99

And improvements to latency metrics:
- Sources should report stream latency of stuck events
  snowplow-incubator/common-streams#104

config/config.aws.reference.hocon

@@ -39,6 +39,17 @@
 
     # -- Duration of shard leases. KCL workers must periodically refresh leases in the dynamodb table before this duration expires.
     "leaseDuration": "10 seconds"
+
+    # -- Controls how to pick the max number of leases to steal at one time.
+    # -- E.g. If there are 4 available processors, and maxLeasesToStealAtOneTimeFactor = 2.0, then allow the KCL to steal up to 8 leases.
+    # -- Allows bigger instances to more quickly acquire the shard-leases they need to combat latency
+    "maxLeasesToStealAtOneTimeFactor": 2.0
+
+    # -- Configures how to backoff and retry in case of DynamoDB provisioned throughput limits
+    "checkpointThrottledBackoffPolicy": {
+      "minBackoff": "100 millis"
+      "maxBackoff": "1 second"
+    }
   }
 
   "output": {

config/config.gcp.reference.hocon

@@ -14,15 +14,22 @@
     # -- The number of threads is equal to this factor multiplied by the number of availble cpu cores
     "parallelPullFactor": 0.5
 
-    # -- How many bytes can be buffered by the loader app before blocking the pubsub client library
-    # -- from fetching more events.
-    # -- This is a balance between memory usage vs how efficiently the app can operate.  The default value works well.
-    "bufferMaxBytes": 10000000
-
-    # -- Sets min/max boundaries on the value by which an ack deadline is extended.
-    # -- The actual value used is guided by runtime statistics collected by the pubsub client library.
-    "minDurationPerAckExtension": "60 seconds"
-    "maxDurationPerAckExtension": "600 seconds"
+    # -- Pubsub ack deadlines are extended for this duration when needed.
+    # -- A sensible value is double the size of the "windowing" config parameter, but no higher than 10 minutes.
+    "durationPerAckExtension": "600 seconds"
+
+    # -- Controls when ack deadlines are re-extended, for a message that is close to exceeding its ack deadline.
+    # -- For example, if `durationPerAckExtension` is `600 seconds` and `minRemainingAckDeadline` is `0.1` then the Source
+    # -- will wait until there is `60 seconds` left of the remining deadline, before re-extending the message deadline.
+    "minRemainingAckDeadline": 0.1
+
+    # -- How many pubsub messages to pull from the server in a single request.
+    "maxMessagesPerPull": 1000
+
+    # -- Adds an artifical delay between consecutive requests to pubsub for more messages.
+    # -- Under some circumstances, this was found to slightly alleviate a problem in which pubsub might re-deliver
+    # -- the same messages multiple times.
+    "debounceRequests": "100 millis"
   }
 
   "output": {

modules/core/src/main/scala/com.snowplowanalytics.snowplow.lakes/Environment.scala

@@ -78,7 +78,7 @@ object Environment {
       windowing <- Resource.eval(EventProcessingConfig.TimedWindows.build(config.main.windowing, config.main.numEagerWindows))
       lakeWriter <- LakeWriter.build(config.main.spark, config.main.output.good)
       lakeWriterWrapped = LakeWriter.withHandledErrors(lakeWriter, appHealth, config.main.retries, destinationSetupErrorCheck)
-      metrics <- Resource.eval(Metrics.build(config.main.monitoring.metrics))
+      metrics <- Resource.eval(Metrics.build(config.main.monitoring.metrics, sourceAndAck))
       cpuParallelism = chooseCpuParallelism(config.main)
     } yield Environment(
       appInfo                 = appInfo,

modules/core/src/main/scala/com.snowplowanalytics.snowplow.lakes/Metrics.scala

@@ -10,13 +10,15 @@
 
 package com.snowplowanalytics.snowplow.lakes
 
+import cats.Functor
 import cats.effect.Async
 import cats.effect.kernel.Ref
 import cats.implicits._
 import fs2.Stream
 
 import scala.concurrent.duration.{Duration, FiniteDuration}
 
+import com.snowplowanalytics.snowplow.sources.SourceAndAck
 import com.snowplowanalytics.snowplow.runtime.{Metrics => CommonMetrics}
 
 trait Metrics[F[_]] {
@@ -32,8 +34,8 @@ trait Metrics[F[_]] {
 
 object Metrics {
 
-  def build[F[_]: Async](config: Config.Metrics): F[Metrics[F]] =
-    Ref[F].of(State.empty).map(impl(config, _))
+  def build[F[_]: Async](config: Config.Metrics, sourceAndAck: SourceAndAck[F]): F[Metrics[F]] =
+    Ref.ofEffect(State.initialize(sourceAndAck)).map(impl(config, _, sourceAndAck))
 
   private case class State(
     received: Int,
@@ -53,11 +55,18 @@ object Metrics {
   }
 
   private object State {
-    def empty: State = State(0, 0, 0, Duration.Zero, None, None)
+    def initialize[F[_]: Functor](sourceAndAck: SourceAndAck[F]): F[State] =
+      sourceAndAck.currentStreamLatency.map { latency =>
+        State(0, 0, 0, latency.getOrElse(Duration.Zero), None, None)
+      }
   }
 
-  private def impl[F[_]: Async](config: Config.Metrics, ref: Ref[F, State]): Metrics[F] =
-    new CommonMetrics[F, State](ref, State.empty, config.statsd) with Metrics[F] {
+  private def impl[F[_]: Async](
+    config: Config.Metrics,
+    ref: Ref[F, State],
+    sourceAndAck: SourceAndAck[F]
+  ): Metrics[F] =
+    new CommonMetrics[F, State](ref, State.initialize(sourceAndAck), config.statsd) with Metrics[F] {
       def addReceived(count: Int): F[Unit] =
         ref.update(s => s.copy(received = s.received + count))
       def addBad(count: Int): F[Unit] =

modules/core/src/test/scala/com.snowplowanalytics.snowplow.lakes/MockEnvironment.scala

@@ -135,6 +135,9 @@ object MockEnvironment {
 
       def isHealthy(maxAllowedProcessingLatency: FiniteDuration): IO[SourceAndAck.HealthStatus] =
         IO.pure(SourceAndAck.Healthy)
+
+      def currentStreamLatency: IO[Option[FiniteDuration]] =
+        IO.pure(None)
     }
 
   private def testSink(ref: Ref[IO, Vector[Action]]): Sink[IO] = Sink[IO] { batch =>

modules/core/src/test/scala/com.snowplowanalytics.snowplow.lakes/TestSparkEnvironment.scala

@@ -70,6 +70,9 @@ object TestSparkEnvironment {
 
       def isHealthy(maxAllowedProcessingLatency: FiniteDuration): IO[SourceAndAck.HealthStatus] =
         IO.pure(SourceAndAck.Healthy)
+
+      def currentStreamLatency: IO[Option[FiniteDuration]] =
+        IO.pure(None)
     }
 
   private def testHttpClient: Client[IO] = Client[IO] { _ =>

modules/gcp/src/main/resources/application.conf

@@ -10,6 +10,7 @@
   "input": ${snowplow.defaults.sources.pubsub}
   "input": {
     "gcpUserAgent": ${gcpUserAgent}
+    "durationPerAckExtension": "600 seconds"
   }
   "output": {
     "bad": ${snowplow.defaults.sinks.pubsub}

project/Dependencies.scala

@@ -49,7 +49,7 @@ object Dependencies {
     val awsRegistry = "1.1.20"
 
     // Snowplow
-    val streams    = "0.8.2-M1"
+    val streams    = "0.10.0-M2"
     val igluClient = "4.0.0"
 
     // Transitive overrides