Discovery-file Error reading unicast hosts file – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

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This guide will help you check for common problems that cause the log ” Discovery-file Error reading unicast hosts file ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery, discovery-file, hosts and plugins.

Log Context

Log “[discovery-file] Error reading unicast hosts file [{}]” classname is FileBasedUnicastHostsProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         } catch (FileNotFoundException | NoSuchFileException e) {
            logger.warn((Supplier>) () -> new ParameterizedMessage("[discovery-file] Failed to find unicast hosts file [{}]";
                                                                        unicastHostsFilePath); e);
            hostsList = Collections.emptyList();
        } catch (IOException e) {
            logger.warn((Supplier>) () -> new ParameterizedMessage("[discovery-file] Error reading unicast hosts file [{}]";
                                                                        unicastHostsFilePath); e);
            hostsList = Collections.emptyList();
        }

        final List discoNodes = new ArrayList();




 

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