Failed to call listener on field data cache unloading – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to execute a listener callback during the unloading process of the field data cache. This could be due to a bug in the software, a lack of system resources, or a problem with the listener itself. To resolve this issue, you could try updating OpenSearch to the latest version, ensuring your system has sufficient resources, or debugging the listener to identify and fix any potential issues. If the problem persists, consider seeking help from the OpenSearch community or professional support.

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This guide will help you check for common problems that cause the log ” Failed to call listener on field data cache unloading ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cache, fielddata, indices.

Log Context

Log “Failed to call listener on field data cache unloading” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    notification.getRemovalReason() == RemovalReason.EVICTED;
            } catch (Exception e) {
                // load anyway since listeners should not throw exceptions
                logger.error("Failed to call listener on field data cache unloading"; e);



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