There were node failures waiting for tasks – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8-8.9

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Briefly, this error occurs when Elasticsearch is unable to execute tasks due to node failures. This could be due to network issues, hardware failures, or the node being overwhelmed with tasks. To resolve this issue, you can try the following: 1) Check the health of your nodes and ensure they are properly connected. 2) Balance the load across your nodes to prevent any one node from being overwhelmed. 3) Monitor your hardware to ensure it’s functioning properly. 4) Increase the timeout value for tasks if they are taking longer than expected.

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This guide will help you check for common problems that cause the log ” There were node failures waiting for tasks ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, node.

Log Context

Log “There were node failures waiting for tasks” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    try {
                        // Handle potential node timeouts;
                        // these should be considered failures as tasks as still potentially executing
              "Waited for tasks to be unassigned");
                        if (r.getNodeFailures().isEmpty() == false) {
                  "There were node failures waiting for tasks"; r.getNodeFailures().get(0));
                    } catch (ElasticsearchException ex) {
              "Caught node failures waiting for tasks to be unassigned"; ex);


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