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Hollow is a java library and toolset for disseminating in-memory datasets from a single producer to many consumers for high performance read-only access. Read more.

Documentation is available at http://hollow.how.

Getting Started

We recommend jumping into the quick start guide — you'll have a demo up and running in minutes, and a fully production-scalable implementation of Hollow at your fingertips in about an hour. From there, you can plug in your data model and it's off to the races.

Get Hollow

Release binaries are available from Maven Central and jCenter.

GroupID/Org ArtifactID/Name Latest Stable Version
com.netflix.hollow hollow 3.0.1

In a Maven .pom file:


In a Gradle build.gradle file:

    compile 'com.netflix.hollow:hollow:3.0.1'

Release candidate binaries, matching the -rc\.* pattern for an artifact's version, are available from the jCenter oss-candidate repository, which may be declared in a build.gradle file:

    repositories {
        maven {
            url 'https://dl.bintray.com/netflixoss/oss-candidate/'

Get Support

Hollow is maintained by the Platform Data Technologies team at Netflix. Support can be obtained directly from us or from fellow users through Gitter or by opening an issue in this project.


Copyright (c) 2016 Netflix, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.