Deploys and manages applications within a YARN cluster
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README.md

Hoya

Hoya 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.

Hoya has a plug-in provider architecture to support different applications, and currently supports Apache HBase and Apache Accumulo.

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 Hoya manager application of container failure. Hoya then asks YARN for a new container, into which Hoya deploys a replacement for the failed component. As a result, Hoya 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

Using Hoya

Developing Hoya

License

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

(http://www.apache.org/licenses/LICENSE-2.0)

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.