dlmarion commented on a change in pull request #1818:
URL: https://github.com/apache/accumulo/pull/1818#discussion_r556571117



##########
File path: core/src/main/java/org/apache/accumulo/core/util/Halt.java
##########
@@ -50,10 +51,9 @@ public void run() {
   public static void halt(final int status, Runnable runnable) {
     try {
       // give ourselves a little time to try and do something
-      new Thread() {
+      new Daemon() {

Review comment:
       Resolved in latest commit.

##########
File path: 
core/src/main/java/org/apache/accumulo/core/classloader/DefaultContextClassLoaderFactory.java
##########
@@ -59,18 +60,20 @@ public DefaultContextClassLoaderFactory(final 
AccumuloConfiguration accConf) {
   }
 
   private static void startCleanupThread(final Supplier<Map<String,String>> 
contextConfigSupplier) {
-    new Timer(className + "-cleanup", true).scheduleAtFixedRate(new 
TimerTask() {
-      @Override
-      public void run() {
-        Map<String,String> contextConfigs = contextConfigSupplier.get();
-        LOG.trace("{}-cleanup thread, properties: {}", className, 
contextConfigs);
-        int prefixlen = 
Property.VFS_CONTEXT_CLASSPATH_PROPERTY.getKey().length();
-        Set<String> contextsInUse = contextConfigs.keySet().stream()
-            .map(k -> k.substring(prefixlen)).collect(Collectors.toSet());
-        LOG.trace("{}-cleanup thread, contexts in use: {}", className, 
contextsInUse);
-        AccumuloVFSClassLoader.removeUnusedContexts(contextsInUse);
-      }
-    }, 60_000, 60_000);
+    final ConfigurationCopy cc = new 
ConfigurationCopy(contextConfigSupplier.get());
+    String size = cc.get(Property.GENERAL_SIMPLETIMER_THREADPOOL_SIZE);
+    if (null == size || size.isEmpty()) {
+      cc.set(Property.GENERAL_SIMPLETIMER_THREADPOOL_SIZE,
+          Property.GENERAL_SIMPLETIMER_THREADPOOL_SIZE.getDefaultValue());
+    }
+    ThreadPools.createGeneralScheduledExecutorService(cc)
+        .scheduleWithFixedDelay(Threads.createNamedRunnable(className + 
"-cleanup", () -> {
+          LOG.trace("{}-cleanup thread, properties: {}", className, cc);
+          Set<String> contextsInUse = cc
+              
.getAllPropertiesWithPrefixStripped(Property.VFS_CONTEXT_CLASSPATH_PROPERTY).keySet();

Review comment:
       Resolved in latest commit.




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