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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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16
akka-distributed-data/src/test/scala/akka/cluster/ddata/GCounterSpec.scala
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@ -11,9 +11,9 @@ import org.scalatest.Matchers
import org.scalatest.WordSpec
class GCounterSpec 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 node3 = UniqueAddress(node1.address.copy(port = Some(2553)), 3)
val node1 = UniqueAddress(Address("akka.tcp", "Sys", "localhost", 2551), 1L)
val node2 = UniqueAddress(node1.address.copy(port = Some(2552)), 2L)
val node3 = UniqueAddress(node1.address.copy(port = Some(2553)), 3L)
"A GCounter" must {
@ -25,10 +25,14 @@ class GCounterSpec 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.state(node1) should be(2)
c6.state(node2) should be(3)
c2.delta.state(node1) should be(1)
c3.delta.state(node1) should be(2)
c6.delta.state(node2) should be(3)
}
"be able to increment each node's record by arbitrary delta" in {
@ -74,7 +78,7 @@ class GCounterSpec extends WordSpec with Matchers {
c16.state(node2) should be(10)
c16.value should be(17)
// counter 1
// counter 2
val c21 = GCounter()
val c22 = c21 increment (node1, 2)
val c23 = c22 increment (node1, 2)
@ -91,11 +95,13 @@ class GCounterSpec extends WordSpec with Matchers {
merged1.state(node1) should be(7)
merged1.state(node2) should be(10)
merged1.value should be(17)
merged1.delta should be(GCounter.empty)
val merged2 = c26 merge c16
merged2.state(node1) should be(7)
merged2.state(node2) should be(10)
merged2.value should be(17)
merged2.delta should be(GCounter.empty)
}
"be able to have its history correctly merged with another GCounter 2" in {