Failed engine – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

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Briefly, this error occurs when Elasticsearch encounters an issue with the underlying storage engine, such as a corruption in the Lucene index or a disk I/O problem. To resolve this, you can try the following: 1) Restart the Elasticsearch node, 2) Check the disk for hardware issues, 3) If the problem is due to corrupted indices, you may need to restore from a backup, 4) If the issue persists, consider reindexing your data. Always ensure you have a good backup strategy to prevent data loss.

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This guide will help you check for common problems that cause the log ” failed engine [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “failed engine [{}]” classname is Engine.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                failedEngine.set((failure != null) ? failure : new IllegalStateException(reason));
                try {
                    // we just go and close this engine - no way to recover
                    closeNoLock("engine failed on: [" + reason + "]"; closedLatch);
                } finally {
                    logger.warn(() -> new ParameterizedMessage("failed engine [{}]"; reason); failure);
                    // we must set a failure exception; generate one if not supplied
                    // we first mark the store as corrupted before we notify any listeners
                    // this must happen first otherwise we might try to reallocate so quickly
                    // on the same node that we don't see the corrupted marker file when
                    // the shard is initializing

 

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