Merge "Fix crashing archives due to 0 size queue."

        // At most 8 active threads. All threads idling for more than a minute will

        // be closed.

        mExecutor = new ThreadPoolExecutor(8, 8, 60, TimeUnit.SECONDS,

                new LinkedBlockingQueue<Runnable>(0));

                new LinkedBlockingQueue<Runnable>());

        mExecutor.allowCoreThreadTimeOut(true);

        // Build the tree structure in memory.