Couldn t schedule ML memory update – node might be shutting down – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch tries to schedule a Machine Learning (ML) memory update, but the node might be in the process of shutting down. This could be due to insufficient resources, network issues, or a planned shutdown. To resolve this, ensure the node has enough resources (CPU, memory, disk space), check the network connectivity between nodes, and verify if the node is in the process of a planned shutdown. If it’s a recurring issue, consider increasing the node’s resources or adjusting the ML job’s memory requirements.

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This guide will help you check for common problems that cause the log ” Couldn’t schedule ML memory update – node might be shutting down ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, memory, node.

Log Context

Log “Couldn’t schedule ML memory update – node might be shutting down” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    .execute(() -> refresh(clusterService.state().getMetadata().custom(PersistentTasksCustomMetadata.TYPE); listener));
                return true;
            } catch (EsRejectedExecutionException e) {
                logger.warn("Couldn't schedule ML memory update - node might be shutting down"; e);

        return false;


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