Failed engine reason – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch encounters an issue with the underlying Lucene engine, which could be due to a corrupted index, disk space issues, or hardware failures. To resolve this, you can try the following: 1) Check the disk space and free up space if necessary. 2) Check the hardware for any failures. 3) If the index is corrupted, consider restoring it from a backup or reindexing the data. 4) Check the Elasticsearch logs for more detailed information about the error.

This guide will help you check for common problems that cause the log ” failed engine [” + reason + “] ” 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 [” + reason + “]” 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(() -> "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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