void sendFailureMessage(ClusterDistributionManager dm, ReplyException rex) {
      // null chunk signals receiver that we are aborting
      ImageReplyMessage.send(getSender(), processorId, rex, dm, null, 0, 0, 1, true, 0, false,
          null, null);
    }
@param entList ArrayList of entries
@param b positive if last chunk
@return true to continue to next chunk
geode-core/src/main/java/org/apache/geode/internal/cache/InitialImageOperation.java