Dangled index directory name is state name is renaming to directory name – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch detects an index that is not referenced in the cluster state. This is known as a “dangled” index. It happens due to abrupt shutdown or data node failures. Elasticsearch tries to recover by renaming the directory. To resolve this, ensure proper shutdown procedures are followed to prevent data loss. Regularly monitor your cluster’s health and handle node failures promptly. Also, consider setting the ‘gateway.recover_after_nodes’ property to control the recovery process of dangled indices. Lastly, ensure your Elasticsearch version is up-to-date as newer versions have better error handling.

This guide will help you check for common problems that cause the log ” dangled index directory name is [{}]; state name is [{}]; renaming to directory name ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: dangled, dangling, index and indices.

Log Context

Log “dangled index directory name is [{}]; state name is [{}]; renaming to directory name” classname is DanglingIndicesState.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 try {
                    IndexMetaData indexMetaData = metaStateService.loadIndexState(indexName);
                    if (indexMetaData != null) {
                        logger.info("[{}] dangling index; exists on local file system; but not in cluster metadata; auto import to cluster state"; indexName);
                        if (!indexMetaData.getIndex().equals(indexName)) {
                            logger.info("dangled index directory name is [{}]; state name is [{}]; renaming to directory name"; indexName; indexMetaData.getIndex());
                            indexMetaData = IndexMetaData.builder(indexMetaData).index(indexName).build();
                        }
                        newIndices.put(indexName; indexMetaData);
                    } else {
                        logger.debug("[{}] dangling index directory detected; but no state found"; indexName);




 

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