Cassandraemplois

need support for hadoop admin role on Hdfs,sqoop,flume,pig,kafka and hbase/cassandra.

Hi All, We are looking for a professional network/database security expert to carry out testing on our systems to ens...applications. Run chained exploits to pivot from multiple exploitable systems. Attack and defeat VPNs, IDS/IPS and other security technologies. Demonstrate data capture techniques. Highly regarded skills include: Experience with at least one commercial relational database (RDBMS) platform such as Oracle, Microsoft SQL, or IBM DB/2. Familiarity with NoSQL databases. Experience with Cassandra, and proficiency in C++ Proficiency in Shell scripting (Bash, Awk, etc) Experience writing production level Python This will be a one off job initially but with the potential to grow into a full time security contract with the right candidate. ...

Web app, social network, user profiles, send an invitation/accept or refuse an invitation, chat option, newsfeed page with easy conten...social network, user profiles, send an invitation/accept or refuse an invitation, chat option, newsfeed page with easy content-based recommendation tool, third party profile for announcer with payment option. Google map plug-in with profiles cartography option, FB profile control processing, FB plug-in to share an event, Instagram plug in to share an event, profile ranking option, connected to Cassandra data base, google analytic plug-in, -website design is going to be provided -need to keep an eye during the development phase by coming directly to you -english, deutsch, serbian or french speaking developer (more infos are gonna be provi...

Hi. We are a IoT and data analytics company, we provide data analytics and foot traffic analytics for retailers and entertainment industries. Now that we're scaling our operations, we need some data scientists to revamp our product and discover some very cool insig... Now that we're scaling our operations, we need some data scientists to revamp our product and discover some very cool insights for our clients. You will be in charge of code and implement our data pipeline (from data reception/ingestion, analytics and machine learning algorithms and dashboards). We need a highly technical Python/R developer who speaks data as second language. (Spark/Cassandra/Kafka/Flume is a plus) This is an offer for a remote full time job and at some point we can relocate yo...

I am looking for a male who has strong experience in Hadoop, Spark, Scala, MapReduce, Oozie, Sqoop, Cassandra, with good experience in Design patterns, ETL. Need good communication skills and available to take phone interview for a contracting position in US EST time zone during working hours. I will send the job description well in advance. There might be multiple phone interview rounds, and the funds will only be transferred only if the interview is success and the candidate is selected. No bidding more than $600.

I am implementing an api for to send browser push notifications to users via GCM (Goole Cloud Messaging) and FPNS( Firefox push notification System). For this We have to make HTTP Post request to GCM and FPNS. To make HTTP request to GCM/FPNS we should have user registration IDs. Using JavaScript we are collecting registration IDs and storing it in Cassandra. Each record contains user registration information (Registration ID and browser type). When we make HTTP request to GCM/FPNS we should send registration IDs along with request to GCM/FPNS based on browser type(If user registration ID belongs to chrome we will make GCM request other wise FPNS request). For example, if we are having 10,000 records we should make around 10,000 requests to FPNS/GCM. Once GCM/FPNS receiv...

I am implementing an api for to send browser push notifications to users via GCM (Goole Cloud Messaging) and FPNS( Firefox push notification System). For this We have to make HTTP Post request to GCM and FPNS. To make HTTP request to GCM/FPNS we should have user registration IDs. Using JavaScript we are collecting registration IDs and storing it in Cassandra. Each record contains user registration information (Registration ID and browser type). When we make HTTP request to GCM/FPNS we should send registration IDs along with request to GCM/FPNS based on browser type(If user registration ID belongs to chrome we will make GCM request other wise FPNS request). For example, if we are having 10,000 records we should make around 10,000 requests to FPNS/GCM. Once GCM/FPNS receiv...

...może być jeszcze wiecej typów. Pisałem baz danych, gdyż jeśli primary key byłby na hashu to wtedy lepiej indeksować kilka baz (wtedy też unikniemy duplikatów) Być może jako backend będzie zastosowany azure table storage (piszę o tym gdyż tam jest pay per GB + pay per transaction (przeba wziąć pod uwagę optymalizację zapytań do obniżenia kosztów). Choć raczej coś lokalnego (np. jako backend cassandra). Baza będzie zawierać na początku około 10 mln słów wraz z ich hashami, docelowo być może nawet kilkaset milionów. Zależy mi na szybkości odpowiedzi (chciałbym uniknąć również ograniczeń języka który zostanie zastosowany) , rate limit per ip w formie captcha. API do bezpośredniego dostępu. Interface prosty jedno pole do wpisania z ...

Need to hire freelancer on hourly basis. -> The duration of work would include minimum 6hours/week -> The below listed expertise is required so the professional relationship with freelancer can be maintained for a longer time -> The nature of work would need expertise on below skills with respective levels (associate/professional/expert) of expertise listed - Automate AWS Infrastructure using Ansible-Ansible Skill Level Required: Professional This would include creating playbooks for AWS resources, Creating playbooks for respective softwares (apache, nginx, cassandradb, mongodb etc) as and when required - Basic docker builds, uploading to AWS ECR, create launch configuration scripts to pull container images from ECR to EC2-Docker & AWS ECR: Professional Leve...

Need a simple gradle Java 1.8 base project with following requirement a. MUST use spring-data-cassandra 1.4.1 or 1.5.0.BUILD-SNAPSHOT b. MUST use 3.0.1 c. Using JPA or any data mapping d. Table/Test for cassandra is below ("Cassandra table" section) e. Build JPA and support java class to insert statement into Person table f. Build JPA and support java class to list records of table Person (use for output) ------------------------------------------ Cassandra table: CREATE TABLE Person ( person_id int PRIMARY KEY, first_name varchar, last_name varchar ); Sample data: insert into person(person_id, first_name,last_name) VALUES (1,'John','Smith'); insert into person(person_id, first...

...Requisitos:Experiencia profesional de al menos 4 años como Senior Software Engineer. Excelentes conocimiento de programación en JavaSólidos conocimientos de JVM, Tomcat, Linux (Deseable)Dominio del protocolo con herramientas de de Play Framework (Deseable)Experiencia con las siguientes tecnologías (Deseable): Elastic Search, Redis, Oracle, MySQL, MongoDB, Memcached, Cassandra, Google BigQuery, AWS DynamoDBExperiencia con Sistemas distribuidos en cloud (AWS, Google App Engine) (Deseable) Beneficios: Cobertura médica prepaga para el grupo en cadena de gimnasios de primer de por graduación, cumpleaños, nacimiento de hijos, casamiento, de trabajo: Capital FederalJornada Laboral: Lunes a viernes de 9 a 18 hs.-

...SOAP (excluyente)- DHTML (deseable)- Perl (deseable)- Unix Shell Scripting (deseable)- .NET (deseable)- MCML (deseable)- C, C++ (deseable)- Manejo de herramientas de diseño y modelado (excluyente)- Conocimientos de los SDK de Windows Media (player, DRM, Windows media server, etc) (deseable)Conocimientos en programación en las siguientes bases de datos:- ORACLE / PL-SQL (nivel intermedio)- NoSQL Cassandra (deseable)Ingles: IntermedioEnvianos tu CV a *********@ esperamos!-...

Nos encontramos en la búsqueda de estudiantes o graduados de carreras de Sistemas con más de 2 años de experiencia en posición similares para incorporase al equipo de ITPrincip...frameworks de desarrollo web tales como Spring MVC o Play Framework ( o similares ) - Habilidad e interés para aprender nuevos lenguajes y frameworks de desarrollo.- Sólidos conocimientos de Programación Orientada a Objetos.- Habilidad para diseñar aplicaciones complejas y explicarlas a sus compañeros de manera efectiva.- Contar con experiencia trabajando con bases de datos tanto noSQL (MongoDB / Cassandra) como SQL (PostgreSQL / MySQL / CloudSQL)- Manejo de software para control de código (GIT, Mercurial, SVN)- Metodologías &Aacut...

I need you to develop some software for me. I would like this software to be developed for Linux. I need a POC Docker containerised Ambari HDFS cluster with Hue and spark on Digital Ocean. Need the full big data ecosystem including oozie mahoot etc ... Basic build... Nothing too complicated... Will be working with the freelancer to get this done quickly

...production environments (running on AWS) operations support Direct Responsibilities: •Development of code for appointed tasks • Self-QA • Review of code (for colleague - developer) • Daily reporting and planning Requirements (hands-on experience): •Sufficient experience in Ruby (3 years +) •Solid knowledge of Ruby on Rails •Relational (MySQL, Postgres, etc.) and NoSQL (Redis, Cassandra, etc.) •Test driven development (RSpec or other) •Knowledge in frontend development techniques (HTML5, CSS3, Javascript) •Expertise in web applications development with Ruby on Rails •Very good skills in TDD and OOP •Understanding of design patterns, data structures, computer programming principles •...

Requirements:-Solid Linux admin skills-Strong scripting knowledge(bash, Python) *at least one-Understanding of middleware, proxies and application integration.-Working knowledge of databases (MySQL, MongoDB, Cassandra, etc.)-Experience managing a LAMP stack.-Knowledge on building systems as Maven and Ant and solid know-how on repository systems such as Git and SVN are a must.-Continuous integration and delivery tools like Jenkins, Bamboo, Go or Teamcity.-Experience using sonarqube or similar tools-Advanced level of english is a MUST-

...username and password (SHA512) for several users · Search function for specific threat information; searchable by title (for instance, <indicator:Title>Malicious URL </indicator:Title>) · Browse function for indicators, documents, known adversaries, victims · Create, update, and delete function for threat intelligence · Knowledge database (Apache Cassandra) to store threat intelligence in STIX/CybOX (XML) format · Using protocols STIX/CybOX for machine and human readable threat intelligence; TAXII for threat data transfer · Connection to external repositories such as: ; to automatically download/upload threat intelligence · Alert for obsolete threat intelli...

I need scripts to be created for following usages. -> Create a shell script to dynamically pass variables into ansible and then trigger the playbook to run -> Create a ansible role to terminate instances based on tag names -> Create a ansible role to create a 6 node cassandra cluster, with 2 nodes acting as organisers/coordinators and autoscale the cluster and create configuration for seed list update - The seed list update can be done in two ways: 1. Update seed list dynamically whenever new node is created 2. Create cluster instances with ENIs and have a static seed list, whenever autoscaling scales up/down use the static private ip and attach the ENI to the new node

We're looking for a full-stack developer with legit experience in AWS, Python, Django, Ubuntu Linux, PostgreSQL, Cassandra, RabbitMQ, memcached, Cron, external API's and has the ability to carry out multiple features on the website, experience with mobile app development is also appreciated (but not necessary in the meantime). We need your help to install the Reddit open-source code () on our AWS, and set up the mail and advertising servers. We don't expect this project to take a lot of time , but depending on the outcomes, we may ask for your help to extend or develop some features of the site if necessary (then we will change it to a long-term project).

...visualization tools for network, server, and application status (Zenoss, Sensu, Nagios, Graphite, Collectd, Ganglia, etc.)<br /><br />Experience with hardware and software firewalls, IPS, WAF, and additional security layers (LDAP, SSO, 2Factor)<br /><br />Experience with continuous integration, testing, and deployment.<br /><br />Experience with RDBMS (PostgreSQL and MySQL). Bonus points for NoSQL (Cassandra, DynamoDB, Couchbase, Mongo)<br /><br />A desire to automate yourself out of a job. We will always have new challenges and problems to solve.<br /><br />Understanding of ITIL terminology like incident and that are nice to have<br />Bonus if you are familiar with MS Exchange, Postfix, MTAs, SMS (smtp & nati...

...success. Requirements Demonstrated experience designing and maintaining large scale, high performance systems and frameworks. Experience with at least one major language (such as Java, Scala, Python, Ruby or C++). Expertise in modern web development using JavaScript, HTML5, and libraries such as Bootstrap, Angular, JQuery, or D3. NoSQL databases experience such as MongoDB, Cassandra, Drupal. Outstanding written and verbal communication skills. Excellent collaborative skills. Attention to detail. Comfortable working in a loosely structured organization. Highly professional, with the ability to deliver solid work on tight schedules. Solid understanding of performance testing, improvement techniques and caching solutions. Doc...

...create a social ecommerce network for seniors. I need a detailed advice on what tools , framework and plateform to use to create a SOCIAL ECOMMERCE NETWORK =============================================== this combo or tools or framework needs to meet all of the conditions below if possible: * affordable * Easy to use * Easy to Maintain * flexible * very scalable (that comes with cassandra database or can be work with it ) * open source * customizable * very stable * Fast and light even with growth * Multi Vendor , Multi Store * where it can integrate or exchange data to other markets like amazon and ebay The top picks that we thought of was: ***Buddypress + woocommerce *** with market place *** ( ) but

looking for someone that knows OSGi framework, Cassandra/splunk, ATG, and soap and restful webservices and who can teach me. it's going to be couple of hours a day depending on which time we follow. I am ready to get going if i find the right candidate. Please lets discuss.

...success. Requirements Demonstrated experience designing and maintaining large scale, high performance systems and frameworks. Experience with at least one major language (such as Java, Scala, Python, Ruby or C++). Expertise in modern web development using JavaScript, HTML5, and libraries such as Bootstrap, Angular, JQuery, or D3. NoSQL databases experience such as MongoDB, Cassandra, Drupal. Outstanding written and verbal communication skills. Excellent collaborative skills. Attention to detail. Comfortable working in a loosely structured organization. Highly professional, with the ability to deliver solid work on tight schedules. Solid understanding of performance testing, improvement techniques and caching solutions. Doc...

...conocimientos deseados<br />Required Skills and Experience<br />Bachelors degree in Computer Science, Computer Engineering, or Electrical Engineering<br /><br />Experience with Cloud architecture and DevOps<br /><br />At least 5 years of experience in hands-on Java programming and related technologies (eclipse, netbeans, hibernate, JPA, Spring, etc)<br /><br />Proficient in TDD, NoSQL (MongoDB or Cassandra), Relational DBs (MSSQL, MySQL, Oracle ), SOA, EDA, and design patterns<br /><br />Hands-on with C, openstack, MVVC and AWS<br /><br />Experience with C++<br /><br />Excellent understanding of current enterprise software technologies and development practices/tools, including virtual environment...

Need a Spring Expert who can on work client machine (remotely) to create an application server that has REST APIs which are subscribed to a Apache Kafka and store the data into the local db(Cassandra) and also pushing the necessary log data to Firebase.

Need a Spring Expert who can on work client machine (remotely) to create an application server that has REST APIs which are subscribed to a Apache Kafka and store the data into the local db(Cassandra) and also pushing the necessary log data to Firebase.

Need help in populating the data in Angular Js where the data is retrieved from cassandra through nodejs

I need some changes in existing Java code

provide me content for Apache Cassandra(75 pages+) ... you can download it from internet but content should be 100% unique.. and it should cover all the portions so that any one can understand it easily.. and it should be in very simple English...I will give you 75$ for each...for two i will pay 150 usd condition 1) I do not care how and from where content is downloaded, but when I search the text on plagiarism checker websites like it should be 100% unique and complete content should not be from single reference point. Condition 2) for each topic there should be near 75 pages text excluding images, kindly provide referenced url for each topic. condition 3) Font size for word doc will be 10 and theme font will be 'Palatino Linotype' condition 4)No

Descripción de empleo<br /><br />En KaizenRH buscamos Analista Programador PLSQL SSr. para trabajar en importante Compañía de Telecomunicaciones.<br /><br />Requisitos<br />Se requiere contar con experiencia comprobable como Programador PLSQL no menor a dos años<br />Contar con experiencia y conocimientos preferentemente en<br />Herramientas NoSQL Cassandra, Elastic Search , Mongo db, Scala, o similares.<br /><br />Perfil proactivo, excelente manejo de relaciones interpersonales, capacidad de análisis y resolución de problemas.<br /><br />Lugar y horario de trabajo<br />Zona Munro, Buenos Aires. De Lunes a Viernes de 09 a 18 hs.<br /><br />Beneficios<br /&...

...Gradle and Sbt<br />- Experience on performance tuning and profiling.<br />- Experience with different testing tools, from a continuous integration to mocking frameworks.<br />- Experience in languages such as Java, NodeJS, Ruby, Python or Go, for instance.<br />- Experience in functional programming oriented languages such as Scala or Clojure.<br />- Experience in persistence systems such as Cassandra, Couchbase, MongoDB or Redis, for instance.<br />- Experience in real-time-ish data processing frameworks such as Hadoop or Spark....

...conocimientos deseados"<br />Required experience and education<br />Bachelors degree in Computer Science, Computer Engineering, or Electrical Engineering<br /><br />Experience with Cloud architecture and DevOps<br /><br />At least 8 years of experience in hands-on Java programming and related technologies (eclipse, netbeans, hibernate, JPA, Spring, etc)<br /><br />Proficient in TDD, NoSQL (MongoDB or Cassandra), Relational DBs (MSSQL, MySQL, Oracle ), SOA, EDA, and design patterns<br /><br />Hands-on with Hadoop, openstack, MVVC and AWS<br /><br />Excellent understanding of current enterprise software technologies and development practices/tools, including virtual environments, source control, remote dev...

I am looking for a female who is expert in Hadoop, MapReduce, Oozie, Sqoop, Cassandra, JAVA, J2EE, with good experience in Design patterns, ETL, Data Structures and Frameworks. Need good communication skills and available to take phone interview for a contracting position in US PST time zone during working hours. I will send the job description well in advance. There might be multiple phone interview rounds, and the funds will only be transferred only if the interview is success and the candidate is selected. No bidding more than $400.

I am looking for a female who is expert in Hadoop, MapReduce, Oozie, Sqoop, Cassandra, JAVA, J2EE,Informatica with good experience in Design patterns, ETL, Data Structures and Frameworks. Need good communication skills and available to take phone interview for a contracting position in US PST time zone during working hours. I will send the job description well in advance. There might be multiple phone interview and skype rounds, and the funds will only be transferred only if the interview is success and the candidate is selected. No bidding more than $400

.../>Computer Science or Engineering graduate/ post-graduate/ doctorate with top marks from a top technical university<br /><br />Experience with Cloud architecture,DevOps, and fast cycle time delivery<br /><br />At least 8 years of experience with hands-on Java programming and related technologies (eclipse, netbeans, hibernate, JPA, Spring, etc)<br /><br />Proficient using TDD, NoSQL (MongoDB or Cassandra), Relational DBs (MSSQL, MySQL, Oracle), SOA, and design patterns<br /><br />Hands-on with Hadoop, openstack, MVVC and AWS<br /><br />Excellent understanding of current enterprise software technologies and development practices/tools, including virtual environments, source control, remote development, issue tracking, b...

We are a VPS provider, we need templates created for KVM, here is the list of the KVM templates that we would like to have. wordpress cPanel cPanel DNS only Cassandra Docker Drupal Ghost Joomla Magenta MonogoDB ownCloud Redline Discourse Dock Elixir Gitlab LAMP MEAN Mumble Server PHPMyAdmin Ruby on Rails Django Drone ELK Logging Stack Joomla LEMP MediaWiki node Redis

I need you to develop some software for me. I would like this software to be developed . Cassandra developer

...deliver them.<br /><br />Required experience and education<br />Bachelors degree in Computer Science, Computer Engineering, or Electrical Engineering<br /><br />Experience with Cloud architecture and DevOps<br /><br />At least 8 years of experience in hands-on Java programming and related technologies (eclipse, netbeans, hibernate, JPA, Spring, etc)<br /><br />Proficient in TDD, NoSQL (MongoDB or Cassandra), Relational DBs (MSSQL, MySQL, Oracle ), SOA, EDA, and design patterns<br /><br />Hands-on with Hadoop, openstack, MVVC and AWS<br /><br />Excellent understanding of current enterprise software technologies and development practices/tools, including virtual environments, source control, remote develo...

Will have to prepare study material to submit in college and along with that need to give the presentations. So Need study material in word doc format and powerpoint slides with images on these subjects Apache Spark - min unique text 30 pages without image Apache Storm - min unique text 30 pages without image Apache HBase - min unique text 30 pages without image Apache Cassandra - min unique text 30 pages without image MongoDB - min unique text 30 pages without image Neo4j - min unique text 30 pages without image Apache Chukwa - min unique text 30 pages without image Apache Kafka - min unique text 30 pages without image Apache Zookeeper - min unique text 30 pages without image Apache Avro - min unique text 30 pages without image Apache Oozie -...

...desarrollo web tales como Spring MVC o Play Framework ( o similares )<br />Habilidad e interés para aprender nuevos lenguajes y frameworks de desarrollo.<br />Sólidos conocimientos de Programación Orientada a Objetos.<br />Habilidad para diseñar aplicaciones complejas y explicarlas a sus compañeros de manera efectiva.<br />Contar con experiencia trabajando con bases de datos tanto noSQL (MongoDB / Cassandra) como SQL (PostgreSQL / MySQL / CloudSQL)<br />Manejo de software para control de código (GIT, Mercurial, SVN)<br />Metodologías Ágiles (Scrum, Kanban)<br /><br />Area De Trabajo<br /><br />Informática<br /><br />Jornada<br /><br />...

...(deseable)<br />Unix Shell Scripting (deseable)<br />.NET (deseable)<br />MCML (deseable)<br />C, C++ (deseable)<br />Manejo de herramientas de diseño y modelado (excluyente)<br />Conocimientos de los SDK de Windows Media (player, DRM, Windows media server, etc) (deseable)<br /><br />Conocimientos En Programación En Las Siguientes Bases De Datos<br /><br />ORACLE / PL-SQL (nivel intermedio)<br />NoSQL Cassandra (deseable)<br /><br />Ingles: Intermedio<br /><br />Area De Trabajo<br /><br />Informática<br /><br />Zona Geográfica<br /><br />GBA Norte<br /><br />Jornada<br /><br />Jornada Completa<br />...

... Will have to prepare study material to submit in college and along with that need to give the presentations. So Need study material in word doc format and powerpoint slides with images on these subjects Apache Spark - min unique text 30 pages without image Apache Storm - min unique text 30 pages without image Apache HBase - min unique text 30 pages without image Apache Cassandra - min unique text 30 pages without image MongoDB - min unique text 30 pages without image Neo4j - min unique text 30 pages without image Apache Chukwa - min unique text 30 pages without image Apache Kafka - min unique text 30 pages without image Apache Zookeeper - min unique text 30 pages without image Apache Avro - min unique text 30 pages without image Apache Oozi...

Will have to prepare study material to submit in college and along with that need to give the presentations. So Need study material in word doc format and powerpoint slides with images on these topics Apache Spark Apache Storm Apache HBase Apache Cassandra MongoDB Neo4j Apache Chukwa Apache Kafka Apache Zookeeper Apache Avro Apache Oozie Apache Mahout condition 1) Image should not be downloaded from google condition 2) Image should be made on powerpoint with animation condition 3) I do not care how and from where the content is downloaded but when I search the text on plagiarism checker websites like it should be 100% unique Condition 4) for each topic there should be

Will have to prepare study material to submit in college in need to give the presentations. So Need study material in word doc format and powerpoint slides with images on these topics Apache Spark - min 30 pages without images Apache Storm - min 30 pages without images Apache HBase - min 30 pages without images Apache Cassandra - min 30 pages without images MongoDB - min 30 pages without images Neo4j - min 30 pages without images Apache Chukwa - min 30 pages without images Apache Kafka - min 30 pages without images Apache Zookeeper - min 30 pages without images Apache Avro - min 30 pages without images Apache Oozie - min 30 pages without

Development , i need people who is good in python , elastic search and cassandra . I can give you good pay reach me at Plus Nine one - zero Nine one seven one zero three three four five four

I need some software developed to use Keware's KepserverEX MQTT and Rest Server, and node-red to write to Cassandra database and D3.js to visualize the data.

I have lots of task to do with this project. So i need someone who are very strong in Apache Spark and Cassandra. I can pay you good. Having knowledge in Cassandra is optional, but Spark is must. NOTE: This is very urgent requirement. Reach me: pgvinoth(at)gmail(dot)com Eight-Zero-Five-two-four-two-five-two-three-three

I have lots of task to do with this project. So i need someone who are very strong in Apache Spark and Cassandra. I can pay you good. Having knowledge in Cassandra is optional, but Spark is must. NOTE: This is very urgent requirement. Reach me: pgvinoth(at)gmail(dot)com Eight-Zero-Five-two-four-two-five-two-three-three

...experience in creating, deploying, and iterating excellent software<br /><br />Proficiency in the following skills and technologies is mandatory:<br /><br /><br /><br />Java EE including (Web Services, REST, JPA).<br /><br />Database (SQL server/Oracle/MySQL)<br /><br />Spring, Hibernate<br /><br />SOA, EDA, and Design patterns.<br /><br />Cloud computing architecting<br /><br />noSQL (MongoDB and/or cassandra)<br /><br />Linux<br /><br />DevOps<br /><br />Proficiency in the Hadoop, MVVC, and knowledge of another programming language (C#, Ruby, PHP) is desired but not mandatory....