Slider is a YARN application to deploy existing distributed applications on YARN, monitor them and make them larger or smaller as desired -even while the cluster is running.

Clusters can be stopped, “frozen” and restarted, “thawed” later; the distribution of the deployed application across the YARN cluster is persisted -enabling a best-effort placement close to the previous locations on a cluster thaw. Applications which remember the previous placement of data (such as HBase) can exhibit fast start-up times from this feature.

YARN itself monitors the health of 'YARN containers" hosting parts of the deployed application -it notifies the Slider manager application of container failure. Slider then asks YARN for a new container, into which Slider deploys a replacement for the failed component. As a result, Slider can keep the size of managed applications consistent with the specified configuration, even in the face of failures of servers in the cluster -as well as parts of the application itself


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. See accompanying LICENSE file.