Caught node failures waiting for tasks to be unassigned – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8-8.9

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Briefly, this error occurs when Elasticsearch encounters issues while trying to unassign tasks from a node, possibly due to node failures or network issues. To resolve this, you can try restarting the failed nodes or the entire cluster. If the issue persists, check the cluster’s health and logs for any anomalies. You may also need to reindex your data if corruption is suspected. Lastly, ensure your cluster’s settings and configurations are correct, particularly those related to node and shard allocation.

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

Log Context

Log “Caught node failures waiting for tasks to be unassigned” classname is TransportSetUpgradeModeAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                            logger.info("There were node failures waiting for tasks"; r.getNodeFailures().get(0));
                        }
                        rethrowAndSuppress(r.getNodeFailures());
                        wrappedListener.onResponse(AcknowledgedResponse.TRUE);
                    } catch (ElasticsearchException ex) {
                        logger.info("Caught node failures waiting for tasks to be unassigned"; ex);
                        wrappedListener.onFailure(ex);
                    }
                }; wrappedListener::onFailure));
        }; wrappedListener::onFailure);

 

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