@Override
  public List peek(int batchSize) throws InterruptedException, CacheException {
    throw new UnsupportedOperationException();
  }
Take will choose a random BucketRegionQueue which is primary and will take the head element
from it.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/parallel/ParallelGatewaySenderQueue.java