Failed to recover from translog – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to recover data from the transaction log (translog) due to corruption or disk issues. The translog is crucial for data recovery after a node restart. To resolve this, you can try to restart the Elasticsearch node. If the error persists, consider restoring from a snapshot if available. If not, you may need to delete the corrupted translog files, but this could lead to data loss. Always ensure to have a backup strategy to prevent such issues.

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

Log Context

Log “failed to recover from translog” class name is InternalEngine.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final long localCheckpoint = getProcessedLocalCheckpoint();
 if (localCheckpoint < recoverUpToSeqNo) {
 try (Translog.Snapshot snapshot = newTranslogSnapshot(localCheckpoint + 1; recoverUpToSeqNo)) {
 opsRecovered = translogRecoveryRunner.run(this; snapshot);
 } catch (Exception e) {
 throw new EngineException(shardId; "failed to recover from translog"; e);
 }
 } else {
 opsRecovered = 0;
 }
 // flush if we recovered something or if we have references to older translogs

 

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