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@InProceedings{ashwarya:icalepcs2019-tubpl05, author = {T. Ashwarya and E.T. Berryman and M.G. Konrad}, title = {{RecSyncETCD: A Fault-tolerant Service for EPICS PV Configuration Data}}, booktitle = {Proc. ICALEPCS'19}, pages = {714--718}, paper = {TUBPL05}, language = {english}, keywords = {operation, network, EPICS, distributed, controls}, venue = {New York, NY, USA}, series = {International Conference on Accelerator and Large Experimental Physics Control Systems}, number = {17}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {08}, year = {2020}, issn = {2226-0358}, isbn = {978-3-95450-209-7}, doi = {10.18429/JACoW-ICALEPCS2019-TUBPL05}, url = {https://jacow.org/icalepcs2019/papers/tubpl05.pdf}, note = {https://doi.org/10.18429/JACoW-ICALEPCS2019-TUBPL05}, abstract = {RecCaster is an EPICS module which is responsible for uploading Process Variables (PVs) metadata from the IOC database to a central server called RecCeiver. The RecCeiver service is a custom-built application that passes this data on to the ChannelFinder, a REST-based search service. Together, RecCaster and RecCeiver form the building blocks of RecSync. RecCeiver is not a distributed service which makes it challenging to ensure high availability and fault-tolerance to its clients. We have implemented a new version of RecCaster which uploads the PV metadata to ETCD. ETCD is a commercial off-the-shelf distributed key-value store intended for high availability data storage and retrieval. It provides fault-tolerance as the service can be replicated on multiple servers to keep data consistently replicated. ETCD is a drop-in replacement for the existing RecCeiver to provide data storage and retrieval for PV metadata. Also, ETCD has a well-documented interface for client operations including the ability to live-watch the PV metadata for its clients. This paper discusses the design and implementation of RecSyncETCD as a fault-tolerant service for storing and retrieving EPICS PV metadata.}, }