ndimiduk commented on code in PR #4954:
URL: https://github.com/apache/hbase/pull/4954#discussion_r1067031749
##########
hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/monkies/PolicyBasedChaosMonkey.java:
##########
@@ -116,13 +116,13 @@ public static <T> T selectWeightedRandomItem(List<Pair<T,
Integer>> items) {
/** Selects and returns ceil(ratio * items.length) random items from the
given array */
public static <T> List<T> selectRandomItems(T[] items, float ratio) {
- int selectedNumber = (int) Math.ceil(items.length * ratio);
-
- List<T> originalItems = Arrays.asList(items);
+ final int selectedNumber = (int) Math.ceil(items.length * ratio);
+ final List<T> originalItems = Arrays.asList(items);
Collections.shuffle(originalItems);
-
- int startIndex = ThreadLocalRandom.current().nextInt(items.length -
selectedNumber);
- return originalItems.subList(startIndex, startIndex + selectedNumber);
+ final int startIndex =
Review Comment:
Yes, it seems so... and it looks like this patch is not sufficient. Here's
the stack trace from branch-2.5.
```
2023-01-10T19:33:35,651 WARN [ChaosMonkey-0] policies.Policy: Exception
occurred during performing action: java.lang.IllegalArgumentException: bound
must be positive
at java.base/java.util.Random.nextInt(Random.java:322)
at
java.base/java.util.concurrent.ThreadLocalRandom.nextInt(ThreadLocalRandom.java:449)
at
org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey.selectRandomItems(PolicyBasedChaosMonkey.java:123)
at
org.apache.hadoop.hbase.chaos.actions.RollingBatchRestartRsAction.selectServers(RollingBatchRestartRsAction.java:130)
at
org.apache.hadoop.hbase.chaos.actions.RollingBatchRestartRsAction.perform(RollingBatchRestartRsAction.java:75)
at
org.apache.hadoop.hbase.chaos.policies.DoActionsOncePolicy.runOneIteration(DoActionsOncePolicy.java:48)
at
org.apache.hadoop.hbase.chaos.policies.PeriodicPolicy.run(PeriodicPolicy.java:41)
at
org.apache.hadoop.hbase.chaos.policies.CompositeSequentialPolicy.run(CompositeSequentialPolicy.java:42)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
```
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