Problem fetching instance list for zone – How to solve related issues

Opster Team

Jan-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 ” Problem fetching instance list for zone ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cloud-aws, discovery-gce, instances and plugins.

Log Context

Log “Problem fetching instance list for zone {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                // assist type inference
                return instanceList.isEmpty() || instanceList.getItems() == null ?
                    Collections.emptyList() : instanceList.getItems();
            } catch (IOException e) {
                logger.warn((Supplier>) () -> new ParameterizedMessage("Problem fetching instance list for zone {}"; zoneId); e);
                logger.debug("Full exception:"; e);
                // assist type inference
                return Collections.emptyList();
        }).reduce(new ArrayList(); (a; b) -> {


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