Host list for ” + hostsSetting.getKey() + ” is empty – How to solve this Elasticsearch error

Host list for ” + hostsSetting.getKey() + ” is empty – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” host list for ” + hostsSetting.getKey() + ” is empty ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: hosts and plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”host list for [” + hostsSetting.getKey() + “] is empty”classname  is Exporter.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

// if the type is http; then hosts must be set
  final String namespace = TYPE_SETTING.getNamespace(TYPE_SETTING.getConcreteSetting(key));
  final Setting> hostsSetting = HttpExporter.HOST_SETTING.getConcreteSettingForNamespace(namespace);
  @SuppressWarnings("unchecked") final List hosts = (List) settings.get(hostsSetting);
  if (hosts.isEmpty()) {
  throw new SettingsException("host list for [" + hostsSetting.getKey() + "] is empty");
  }
  break;
  case "local":
  break;
  default:

Run the Check-Up to get customized recommendations like this:

error

Heavy merges detected in specific nodes

error-img

Description

A large number of small shards can slow down searches and cause cluster instability. Some indices have shards that are too small…

error-img

Recommendations Based on your specific ES deployment you should…

Based on your specific ES deployment you should…

1

X-PUT curl -H [a customized recommendation]

 

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