[GitHub] [hbase] virajjasani commented on a change in pull request #2000: HBASE-24658 Update PolicyBasedChaosMonkey to handle uncaught exceptions

[GitBox <gi...@apache.org>]

virajjasani commented on a change in pull request #2000:
URL: https://github.com/apache/hbase/pull/2000#discussion_r452815115



##########
File path: hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/monkies/PolicyBasedChaosMonkey.java
##########
@@ -38,14 +42,16 @@
 
   private static final Logger LOG = LoggerFactory.getLogger(PolicyBasedChaosMonkey.class);

Review comment:
       nit: redundant

##########
File path: hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/monkies/PolicyBasedChaosMonkey.java
##########
@@ -60,19 +66,30 @@ public PolicyBasedChaosMonkey(IntegrationTestingUtility util, Collection<Policy>
   }
 
   public PolicyBasedChaosMonkey(Properties monkeyProps, IntegrationTestingUtility util,
-    Policy... policies) {
-    this.monkeyProps = monkeyProps;
-    this.util = util;
-    this.policies = policies;
+    Collection<Policy> policies) {
+    this(monkeyProps, util, policies.toArray(new Policy[0]));
   }
 
   public PolicyBasedChaosMonkey(Properties monkeyProps, IntegrationTestingUtility util,
-    Collection<Policy> policies) {
+    Policy... policies) {
     this.monkeyProps = monkeyProps;
-    this.util = util;
-    this.policies = policies.toArray(new Policy[policies.size()]);
+    this.util = Objects.requireNonNull(util);
+    this.policies = Objects.requireNonNull(policies);
+    if (policies.length == 0) {
+      throw new IllegalArgumentException("policies may not be empty");
+    }
+    this.monkeyThreadPool = buildMonkeyThreadPool(policies.length);
   }
 
+  private static ExecutorService buildMonkeyThreadPool(final int size) {
+    return Executors.newFixedThreadPool(size, new ThreadFactoryBuilder()

Review comment:
       Would you prefer using our internal 
   `Threads.newDaemonThreadFactory(String prefix, UncaughtExceptionHandler handler)` ?




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