MongoDB 2.0 Released

MongoDB
September 12, 2011 | Updated: January 20, 2017
#Releases

The MongoDB development team is pleased to announce the release of version 2.0.0.  Version 2.0 is the latest stable release, following the March 2011 release of version 1.8.  This release includes many new features, improvements to existing features, and performance enhancements.

Please note version 2.0 is a significant new release, but is 2.0 solely because 1.8 + 0.2 = 2.0; for example the upgrade from 1.6 to 1.8 was similar in scope.

Highlights of the 2.0 release:

Concurrency improvements in 2.0 are just the start of a much larger concurrency roadmap we are working on.  In 2.0, we are beginning to address one of the biggest issues: holding locks during a page fault.  2.0 tracks memory caching and has the ability to yield locks and fault outside.  This is hooked in a number places, notably: updates by _id, remove, and long table scans.

Being able to keep the working index set in memory is an important factor in overall performance, and we overhauled indexes to make this easier.  Indexes in 2.0 are about 25% smaller and faster, meaning that you can fit more in memory.

Replica sets get two new important features in 2.0: priorities and tagging.  Priorities let you have nodes that you prefer to be primary if you have a non homogeneous environment.  Tagging lets you guarantee writes hit certain groups of servers.  One use case for this is guaranteeing a new user registration is written to two data centers before acknowledging to a user.

There were many other improvements, so we encourage those interested to look at the change log.  Overall, this release added a large number of small performance and concurrency improvements, greater stability to sharding, and better replica set operations.

<span >Downloads: <span >http://www.mongodb.org/downloads<span > 

<span >Release Notes: <span >http://www.mongodb.org/display/DOCS/2.0+Release+Notes<span > 

<span >Full change log: https://jira.mongodb.org/secure/IssueNavigator.jspa?requestId=10140

For the full scoop on what’s new in MongoDB version 2.0, register for our live webinar on Thursday, September 15th. We will have two sessions: the first at 10am GMT, and another at 1:30pm ET/10:30am PT.

Thank you to the MongoDB community for your continued feedback and testing through the 1.9 development series.

-Eliot and the MongoDB Team

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BSON and Data Interchange

There’s a lot of good things about JSON &ndash; it’s a standards based, language independent, representation of object-like data. Also, it’s easy to read (for users and programmers alike). Each document is only about data, not complex object graphs and links. Thus it’s easy to inspect without knowing all the code of an application. Further, JSON is “schemaless”. We do not have to predefine our (protocol) schema. This can be quite helpful: imagine RPC’ing data from client A to server B with a fixed schema for the messages. On a schema change both need to be ‘updated’ with the new schema. If there are many components to the system it’s even more complicated of course. There is some analogy here to XML, which can (optionally) be schemaless. It would be nice to have a binary representation of JSON. That is what BSON is all about. So what are the goals of BSON? They are: Fast scan-ability. For very large JSON documents, scanning can be slow. To skip a nested document or array we have to scan through the intervening field completely. In addition as we go we must count nestings of braces, brackets, and quotation marks. In BSON, the size of these elements is at the beginning of the field’s value, which makes skipping an element easy. Easy manipulation. We want to be able to modify information within a document efficiently. For example, incrementing a field’s value from 9 to 10 in a JSON text document might require shifting all the bytes for the remainder of the document, which if the document is large could be quite costly. (Albeit this benefit is not comprehensive: adding an element to an array mid-document would result in shifting.) It’s also helpful to not need to translate the string “9” to a numeric type, increment, and then translate back. Additional data types. JSON is potentially a great interchange format, but it would be nice to have a a few more data types. Most importantly is the addition of a “byte array” data type. This avoids any need to do base64 encoding, which is awkward. One thing that is not a goal of BSON: compactness. The JSON document {“field”:7} represents the number seven as a single byte. That’s pretty good. Perhaps the best example to date of usage of BSON is MongoDB. MongoDB uses it heavily &ndash; for sending documents over the network, persisting them to disk, as well as for internal data manipulations. In fact this is where BSON originated, although today it is a separate spec that should not be considered coupled to any one particular project. There is BSON serialization and deserialization code for most languages; implementations are open source and mostly available under Apache 2 license. Quite a few implementations originated from a MongoDB drivers; work is underway in most drivers to fully decouple, although independent use works fine today. If you or someone you know is using BSON in a project, please let us know by posting on the BSON mailing list . Check out bsonspec.org for more information. &ndash; Spencer & Dwight

August 24, 2011
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Being Latine in Tech: Two MongoDB Employees Share Their Advice on Building Careers in Engineering

Ashley Naranjo and Martin Bajana, members of MongoDB’s employee resource group QueLatine, share their career journeys and offer insight into how other members of the Latine community can build careers in tech. Jackie Denner: How did you make your way into the tech industry? Ashley Naranjo: I am a first-generation Latina with a passion for Information Technology and a knack for problem-solving. After graduating early from high school, I embarked on a career in Nursing. I chose Nursing initially because I wanted to make a difference and help others, but my path took an unexpected turn when COVID-19 reshaped our world. In light of the circumstances, I reevaluated my options and decided to seize an opportunity with a program called Year Up . During the intensive six-month training and deployment phase, I not only completed rigorous coursework but also obtained IT Google Coursera certifications and actively pursued CompTIA certifications. This experience allowed me to secure an internship at Meta (Facebook) as an Enterprise Operation IT Support Tech, where my love for technology blossomed. During my time at Meta, I had the privilege of assisting diverse Meta users worldwide with a wide range of technical issues, including troubleshooting, software and hardware support, internal access permissions, and more. The exposure to a global tech environment further fueled my passion for the field. When my internship concluded, I was offered a 1-year contract role with Meta to continue my work as a support tech for the same team. Throughout that year, I immersed myself in all aspects of technology, maximizing my learning opportunities and applying my networking skills. As time went on, I knew I needed a new challenge. This led me to embark on a search for an exciting role, which eventually brought me to MongoDB. I am passionate about driving technological innovation, and MongoDB is a place where I can make an impact. Martin Bajana: My interest in technology stems from a variety of sources. From a young age, I developed a strong passion for video games and exploring new technologies. Whether it was experimenting with the latest gaming consoles or delving into computer hardware, I relished the opportunity to learn and understand the inner workings of these technologies. In school, I discovered my affinity for mathematics, which further solidified my decision to pursue a career in the tech industry. Choosing to study computer science in college was a natural progression for me, as it allowed me to combine my love for technology with my aptitude for problem-solving. After completing my education, I was recruited by Verizon, where I worked on front-end applications and Android development. Although the transition was initially challenging, I persevered and regained my confidence. It was during this period that I realized a career in technology was my long-term aspiration. Throughout my tenure at Verizon, I embraced opportunities to work across various teams, acquiring valuable experience and honing my skills. Eventually, I made the decision to join MongoDB, which has provided me with an enriching journey and the chance to shape my career in the tech industry. JD: Have there been any challenges you've faced throughout your career? AN: Imposter syndrome has been a significant challenge for me throughout my career, and it's something I still deal with to this day. When surrounded by my talented colleagues, I would often compare myself to them and focus on my perceived weaknesses and flaws, leading to a lack of self-confidence. However, I tackled this issue by addressing my feelings with my manager. Her support and guidance helped me realize my own potential and acknowledge my accomplishments. Maintaining a positive mindset has enabled me to view myself as a competent engineer and recognize the value I bring to my team. I have learned to take ownership of my successes and embrace opportunities for growth. Stepping out of my comfort zone has become a regular practice, as personal and professional development often stems from embracing challenges and discomfort. By giving myself permission to take up space and be confident in my abilities, I have been able to overcome imposter syndrome and continue to thrive in my role. MB: I have been fortunate enough to work for companies and teams that value and respect me for the work I deliver. Being in the tech industry and growing up in a culturally diverse region of the country, I have had exposure to individuals from various backgrounds and identities, which has made me more comfortable as a Latinx individual in the industry. My personal goal is to promote a work environment where everyone is judged based on the contributions they bring to the team, rather than their identity. I believe in supporting and respecting the identities of my peers and coworkers while fostering a culture of inclusivity and equality. JD: How has MongoDB supported your career growth and development? AN: In my time working at MongoDB, I have experienced exceptional support that has greatly contributed to my professional development and growth. As an engineer at MongoDB, I have been provided with numerous opportunities to expand my knowledge and skills through participation in tech talks, hackathons, and continuous learning about emerging technologies. I am grateful for the proactive approach taken by my manager and team leaders in fostering my growth as an engineer. Additionally, MongoDB's commitment to diversity and inclusion is evident through the company's DEI initiatives. Platforms like our employee resource group “QueLatine” have made me feel a stronger sense of connection and belonging, particularly among my Latinx peers. By recognizing the power of our diverse backgrounds and experiences, MongoDB empowers us to have a meaningful impact in the industry. MB: I have experienced full support from my leader since day one. They have proactively sought to understand my career goals and have helped me create a clear career path to achieve those goals. This level of support has enabled me to take on challenging projects and initiatives within the company, allowing me to grow and develop in my career. Furthermore, MongoDB offers a wealth of learning and development resources to its employees, which I have fully utilized to continue learning and growing my skill set. JD: What is your advice for other Latines who want to begin careers in tech? AN: Having made a significant career change myself, I can empathize with the challenges that come with exploring new paths, particularly in the tech industry. As a Latina in tech, I feel a strong desire to encourage and raise awareness within our community about the incredible resources and opportunities that are available to us. My advice to others who may be considering a similar journey is to prioritize the continuous development of your technical skills, actively seek out mentoring opportunities, push yourself beyond your comfort zone by honing your networking abilities, and most importantly, believe in yourself and your ability to achieve great things! MB: Navigating the vast world of technology can certainly be overwhelming, but it's important not to fear feeling lost. Even after 12 years in this career, there are still days where I come across something I've never heard of before. Fortunately, we live in a world abundant with resources for continuous learning. My advice is to take the time to explore and ask questions. Seek out open-source projects that you can contribute to, and connect with other professionals in the tech industry who can share their experiences and provide guidance. Additionally, taking advantage of hackathons and other tech events can expose you to new technologies and ideas. Don't be afraid to make mistakes, and most importantly, don't give up! Join us in transforming the way developers work with data. Build your tech career at MongoDB .

September 20, 2023