Problem fetching instance list for zone – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to retrieve the list of instances for a specific zone. This could be due to network connectivity issues, incorrect zone configuration, or insufficient permissions. To resolve this, you can check your network connection, verify the zone configuration in your OpenSearch settings, and ensure that the user or role has the necessary permissions to access the instance list. Additionally, check for any underlying system issues that might be causing the problem.

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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 OpenSearch concepts: discovery-gce, plugins.

Log Context

Log “Problem fetching instance list for zone {}” classname is
We extracted the following from OpenSearch 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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