@Override
        public void run() {
          while (!walkersStop) {
            try {
              long node = selectLoop();
              try {
                walkLoop(node);
              } catch (IOException e) {
                context.getCounter(GeneratorCounts.IOEXCEPTION).increment(1l);
                return;
              }
            } catch (InterruptedException e) {
              return;
            }
          }
        }
Randomly selects and walks a random flushed loop concurrently with the Generator Mapper by
spawning ConcurrentWalker's with specified StartNodes. These ConcurrentWalker's are
configured to only log erroneous nodes.
hbase-it/src/test/java/org/apache/hadoop/hbase/test/IntegrationTestBigLinkedList.java