protected void startBackgroundPrefill() {
    if (havePrefillTask.compareAndSet(false, true)) {
      try {
        backgroundProcessor.execute(new PrefillConnectionsTask());
      } catch (RejectedExecutionException e) {
        // ignore, the timer has been cancelled, which means we're shutting
        // down.
      }
    }
  }
Destroys connection if and only if {@link ConnectionAccounting} exceeds maximum.

@return true if connection is destroyed, otherwise false.
geode-core/src/main/java/org/apache/geode/cache/client/internal/pooling/ConnectionManagerImpl.java