adding failureModes with special erasure patterns

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>

DAS/shape.py

@@ -3,11 +3,12 @@
 class Shape:
     """This class represents a set of parameters for a specific simulation."""
 
-    def __init__(self, blockSize, numberNodes, failureRate, class1ratio, chi, vpn1, vpn2, netDegree, bwUplinkProd, bwUplink1, bwUplink2, run):
+    def __init__(self, blockSize, numberNodes, failureModel, failureRate, class1ratio, chi, vpn1, vpn2, netDegree, bwUplinkProd, bwUplink1, bwUplink2, run):
         """Initializes the shape with the parameters passed in argument."""
         self.run = run
         self.numberNodes = numberNodes
         self.blockSize = blockSize
+        self.failureModel = failureModel
         self.failureRate = failureRate
         self.netDegree = netDegree
         self.class1ratio = class1ratio
@@ -24,6 +25,7 @@ class Shape:
         shastr = ""
         shastr += "bs-"+str(self.blockSize)
         shastr += "-nn-"+str(self.numberNodes)
+        shastr += "-fm-"+str(self.failureModel)
         shastr += "-fr-"+str(self.failureRate)
         shastr += "-c1r-"+str(self.class1ratio)
         shastr += "-chi-"+str(self.chi)

DAS/validator.py

@@ -122,10 +122,54 @@ class Validator:
             self.logger.warning("I am not a block proposer", extra=self.format)
         else:
             self.logger.debug("Creating block...", extra=self.format)
+            if self.shape.failureModel == "random":
                 order = [i for i in range(self.shape.blockSize * self.shape.blockSize)]
                 order = random.sample(order, int((1 - self.shape.failureRate/100) * len(order)))
                 for i in order:
                     self.block.data[i] = 1
+            elif self.shape.failureModel == "sequential":
+                order = order[:int((1 - self.shape.failureRate/100) * len(order))]
+                for i in order:
+                    self.block.data[i] = 1
+            elif self.shape.failureModel == "MEP": # Minimal size non-recoverable Erasure Pattern
+                for r in range(self.shape.blockSize):
+                    for c in range(self.shape.blockSize):
+                        k = self.shape.blockSize/2
+                        if r > k or c > k:
+                            self.block.setSegment(r,c)
+            elif self.shape.failureModel == "MEP+1": # MEP +1 segment to make it recoverable
+                for r in range(self.shape.blockSize):
+                    for c in range(self.shape.blockSize):
+                        k = self.shape.blockSize/2
+                        if r > k or c > k:
+                            self.block.setSegment(r,c)
+                self.block.setSegment(0, 0)
+            elif self.shape.failureModel == "DEP":
+                for r in range(self.shape.blockSize):
+                    for c in range(self.shape.blockSize):
+                        k = self.shape.blockSize/2
+                        if (r+c) % self.shape.blockSize > k:
+                            self.block.setSegment(r,c)
+            elif self.shape.failureModel == "DEP+1":
+                for r in range(self.shape.blockSize):
+                    for c in range(self.shape.blockSize):
+                        k = self.shape.blockSize/2
+                        if (r+c) % self.shape.blockSize > k:
+                            self.block.setSegment(r,c)
+                self.block.setSegment(0, 0)
+            elif self.shape.failureModel == "MREP": # Minimum size Recoverable Erasure Pattern
+                for r in range(self.shape.blockSize):
+                    for c in range(self.shape.blockSize):
+                        k = self.shape.blockSize/2
+                        if r < k and c < k:
+                            self.block.setSegment(r,c)
+            elif self.shape.failureModel == "MREP-1": # make MREP non-recoverable
+                for r in range(self.shape.blockSize):
+                    for c in range(self.shape.blockSize):
+                        k = self.shape.blockSize/2
+                        if r < k and c < k:
+                            self.block.setSegment(r,c)
+                self.block.setSegment(0, 0, 0)
 
             nbFailures = self.block.data.count(0)
             measuredFailureRate = nbFailures * 100 / (self.shape.blockSize * self.shape.blockSize)

config_example.py

@@ -39,6 +39,9 @@ runs = range(2)
 # Number of validators
 numberNodes = range(256, 513, 128)
 
+# select failure model between: "random, sequential, MEP, MEP+1, DEP, DEP+1, MREP, MREP-1"
+failureModels = ["random"]
+
 # Percentage of block not released by producer
 failureRates = range(10, 91, 40)