dcapwell commented on code in PR #28:
URL: https://github.com/apache/cassandra-accord/pull/28#discussion_r1092345564
##########
accord-core/src/test/java/accord/impl/basic/DelayedExecutorService.java:
##########
@@ -0,0 +1,107 @@
+package accord.impl.basic;
+
+import accord.burn.random.Decision;
+import accord.burn.random.IntRange;
+import accord.burn.random.RandomInt;
+import accord.burn.random.SegmentedIntRange;
+import org.apache.cassandra.concurrent.FutureTask;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.AbstractExecutorService;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+public class DelayedExecutorService extends AbstractExecutorService
+{
+ private final PendingQueue pending;
+ private final Random random;
+ private final RandomInt jitterInNano;
+
+ public DelayedExecutorService(PendingQueue pending, Random random)
+ {
+ this.pending = pending;
+ this.random = random;
+ this.jitterInNano = new SegmentedIntRange(
+ new IntRange(microToNanos(0), microToNanos(50)),
+ new IntRange(microToNanos(50), msToNanos(5)),
+ // this is different from Apache Cassandra Simulator as this
is computed differently for each executor
Review Comment:
In better understanding `RandomWalkDecision`, the reason for the period
being so low is that we are asking for between 1-10% chance, so we can't have
long periods in order to respect that... for that range here is what I see
```
Number of trues: 4110(4.109999999999999%)
Number of false: 95890(95.89%)
True seq count 0 happened 91999 times
True seq count 1 happened 3689 times
True seq count 2 happened 187 times
True seq count 3 happened 14 times
True seq count 4 happened 1 times
```
switching between 10-20% I see
```
Number of trues: 15340(15.340000000000002%)
Number of false: 84660(84.66%)
True seq count 0 happened 71748 times
True seq count 1 happened 10884 times
True seq count 2 happened 1690 times
True seq count 3 happened 285 times
True seq count 4 happened 44 times
True seq count 5 happened 9 times
```
Using `FixedChance` I see
```
Number of trues: 4047(4.047%)
Number of false: 95953(95.953%)
True seq count 0 happened 92059 times
True seq count 1 happened 3750 times
True seq count 2 happened 135 times
True seq count 3 happened 9 times
```
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