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Backport "HBASE-27563 ChaosMonkey sometimes generates invalid boundaries for random item selection" to branch-2.4 #4962

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merged 2 commits into from
Jan 12, 2023
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Backport "HBASE-27563 ChaosMonkey sometimes generates invalid boundaries for random item selection" to branch-2.4 #4962

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010a26f
HBASE-27563 ChaosMonkey sometimes generates invalid boundaries for ra…
ndimiduk Jan 10, 2023
0dbe45d
fixes for branch-2.4
ndimiduk Jan 12, 2023
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37 changes: 31 additions & 6 deletions hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/monkies/PolicyBasedChaosMonkey.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
*/
package org.apache.hadoop.hbase.chaos.monkies;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
Expand All @@ -30,13 +31,16 @@
import org.apache.hadoop.hbase.IntegrationTestingUtility;
import org.apache.hadoop.hbase.chaos.policies.Policy;
import org.apache.hadoop.hbase.util.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;

/**
* Chaos monkey that given multiple policies will run actions against the cluster.
*/
public class PolicyBasedChaosMonkey extends ChaosMonkey {
private static final Logger LOG = LoggerFactory.getLogger(PolicyBasedChaosMonkey.class);

private static final long ONE_SEC = 1000;
private static final long ONE_MIN = 60 * ONE_SEC;
Expand Down Expand Up @@ -116,13 +120,31 @@ 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);
/*
* N.b. `ratio` values are not validated. Be aware of excessive values and floating point
* arithmetic rounding. Guard against negative input to Random#next() and exceeding boundaries
* in call to List#subList.
*/

List<T> originalItems = Arrays.asList(items);
Collections.shuffle(originalItems);
// clamp ratio to [0.0,1.0]
ratio = Math.max(Math.min(ratio, 1.0f), 0.0f);

int startIndex = ThreadLocalRandom.current().nextInt(items.length - selectedNumber);
return originalItems.subList(startIndex, startIndex + selectedNumber);
final int selectedNumber = (int) Math.ceil(items.length * ratio);

// shuffle a copy of the input, not the input.
final List<T> shuffledItems = new ArrayList<>(items.length);
shuffledItems.addAll(Arrays.asList(items));
Collections.shuffle(shuffledItems);

if (selectedNumber >= items.length) {
return shuffledItems;
}

// apply basic sanity check on sublist selection range.
final int startIndex =
Math.max(0, ThreadLocalRandom.current().nextInt(items.length - selectedNumber));
final int endIndex = Math.min(items.length, startIndex + selectedNumber);
return shuffledItems.subList(startIndex, endIndex);
}

@Override
Expand Down Expand Up @@ -151,7 +173,10 @@ public boolean isStopped() {

@Override
public void waitForStop() throws InterruptedException {
monkeyThreadPool.awaitTermination(1, TimeUnit.MINUTES);
if (!monkeyThreadPool.awaitTermination(1, TimeUnit.MINUTES)) {
LOG.warn("Some pool threads failed to terminate. Forcing. {}", monkeyThreadPool);
monkeyThreadPool.shutdownNow();
}
}

@Override
Expand Down