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Add support for delta-CRDT, #21875

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* delta GCounter and PNCounter
* first stab at delta propagation protocol
* send delta in the direct write
* possibility to turn off delta propagation
* tests
* protobuf serializer for DeltaPropagation
* documentation
This commit is contained in:
Patrik Nordwall 2017-01-04 15:25:12 +01:00
parent 2a9fa234a1
commit 3e7ffd6b96
18 changed files with 2408 additions and 98 deletions
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22
akka-distributed-data/src/test/scala/akka/cluster/ddata/PNCounterSpec.scala
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@ -11,8 +11,8 @@ import org.scalatest.Matchers
import org.scalatest.WordSpec
class PNCounterSpec extends WordSpec with Matchers {
val node1 = UniqueAddress(Address("akka.tcp", "Sys", "localhost", 2551), 1)
val node2 = UniqueAddress(node1.address.copy(port = Some(2552)), 2)
val node1 = UniqueAddress(Address("akka.tcp", "Sys", "localhost", 2551), 1L)
val node2 = UniqueAddress(node1.address.copy(port = Some(2552)), 2L)
"A PNCounter" must {
@ -24,10 +24,18 @@ class PNCounterSpec extends WordSpec with Matchers {
val c4 = c3 increment node2
val c5 = c4 increment node2
val c6 = c5 increment node2
val c6 = c5.resetDelta increment node2
c6.increments.state(node1) should be(2)
c6.increments.state(node2) should be(3)
c2.delta.value.toLong should be(1)
c2.delta.increments.state(node1) should be(1)
c3.delta.value should be(2)
c3.delta.increments.state(node1) should be(2)
c6.delta.value should be(3)
c6.delta.increments.state(node2) should be(3)
}
"be able to decrement each node's record by one" in {
@ -38,10 +46,16 @@ class PNCounterSpec extends WordSpec with Matchers {
val c4 = c3 decrement node2
val c5 = c4 decrement node2
val c6 = c5 decrement node2
val c6 = c5.resetDelta decrement node2
c6.decrements.state(node1) should be(2)
c6.decrements.state(node2) should be(3)
c3.delta.value should be(-2)
c3.delta.decrements.state(node1) should be(2)
c6.delta.value should be(-3)
c6.delta.decrements.state(node2) should be(3)
}
"be able to increment each node's record by arbitrary delta" in {