The results are in! We’ve got the results of the 2015 Solr Developer Survey – thank you to everyone that participated. It really helps us see a snapshot in time of the vibrant Solr community and how developers all over the world are doing amazing things with Apache Solr.

Basic Demographics

We kicked off the survey asking some basic demographic questions education, salary, industry, etc.

Most developers work full-time in technology/telecom and have a graduate-level education. More details below:

developer-survey-charts-2015.001 developer-survey-charts-2015.002 developer-survey-charts-2015.003 developer-survey-charts-2015.004 developer-survey-charts-2015.005

Location

Not surprisingly, most of our developers surveyed live in the United States with India a close second. Germany, UK, Italy, and France following after that.

developer-survey-charts-2015.008 

Version of Solr

We’re always curious about this one: Who is still working with older versions of Solr? It’s good to see Solr 4 at the head of the pack – with some developers still having to create or maintain apps built on Solr 1.4 (released back in November of 2009). developer-survey-charts-2015.007

Connectors and Data Sources

Before you can search your data you’ve got to get it into your Solr index. We asked the Solr developer community what connectors they relied on most for bringing their data sources into their Solr instance ready for indexing. MySQL and local filesystems like internal network drives and other resources were at the top – no surprise there. Other database technologies rounded out the top data sources with Amazon S3, the public web, and Hadoop all making an appearance.

developer-survey-charts-2015.009

Authentication, Security, and Redaction

Security is paramount when building search-driven applications that are created for a larger user base. The most popular authentication protocols are pretty much standard across the board for most developers: LDAP, Kerberos, and Active Directory.

developer-survey-charts-2015.010

We also wanted to know what levels and complexity of security that developers were using to block users from viewing unauthorized content. 40% said that they had no level of security – which is more than a little distressing. About the same amount had deployed document level security within a search app with other levels and methods following:

developer-survey-charts-2015.011

UI Frameworks

It’s always a thorny topic asking developers what frameworks they are using for their application. No surprise to see jQuery at the top with AngularJS.developer-survey-charts-2015.012

Query Types

The survey also included a question to gauge the level of sophistication of query types apps that developers were including in their Solr apps. Text and keyword search was obvious and remains the foundation of most search projects. It was good to see representation for semantic and conceptual search becoming more prominent. And as mobile devices continue to take over the world, spatial and geo-specific search is more important than ever in helping users find people, resources, products, and services, and search results that are around where they are right now.

developer-survey-charts-2015.013

ETL Pipelines and Transformations at Indexing Time

We also wanted to know a little about what types of transformations Solr apps were performing at indexing time. The top transformations were pretty common across those surveyed –  at between 40% and 60% – included synonym identification, content extraction, metadata extraction and enrichment, named entity classification, taxonomies and ontologies. Sentiment analysis and security enrichment were less common.

developer-survey-charts-2015.014

ETL Pipelines and Transformations at Query Time

Transformations can also take place on the query side – as a query is sent by the user to the app and the list of results is returned to the user. Faceting, auto-suggest, and boost/block were in use by nearly half of the applications that developers were working on. Expect to see user feedback signals move up the chain as more search applications start aggregating user behavior to influence search results for an individual user, a particular cohort, or across the entire user base.

developer-survey-charts-2015.015

 Big Data Integrations

Solr plays well with others so we wanted to get a sense of what big data libraries and modules developers are adding to the mix. Storage and scalability workhorse Hadoop was part of the picture for over half of devs surveyed with Mongo and Spark in 1/3. Familiar faces like Cassandra, HBase, Hive, and Pig rounded out the less popular modules.

developer-survey-charts-2015.016

Custom Coding

And finally we wanted to know the kind of blood, sweat, and tears being poured into custom development. When you can’t find a library or the module that you need what do you do?

developer-survey-charts-2015.017

And that’s the end of our 2015 developer survey.

Thank you to everyone who participated and we’ll see ya in late 2016 to do an update!