public <T> AsyncBatchRpcRetryingCaller<T> build() {
      return new AsyncBatchRpcRetryingCaller<>(retryTimer, conn, tableName, actions, pauseNs,
        pauseNsForServerOverloaded, maxAttempts, operationTimeoutNs, rpcTimeoutNs,
        startLogErrorsCnt, requestAttributes);
    }
Create retry caller for scanning a region.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncRpcRetryingCallerFactory.java