Prepare target for translog failed – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while preparing the target for the transaction log (translog). This could be due to insufficient disk space, network connectivity issues, or file system corruption. To resolve this, you can try freeing up disk space, checking network connections, or repairing the file system. Additionally, ensure that the OpenSearch process has the necessary permissions to write to the translog directory. If the error persists, consider restarting the OpenSearch node or, as a last resort, reindexing the data.

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This guide will help you check for common problems that cause the log ” prepare target for translog failed ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: recovery, indices.

Log Context

Log “prepare target for translog failed” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 final ActionListener wrappedListener = ActionListener.wrap(nullVal -> {
 final TimeValue tookTime = stopWatch.totalTime();
 logger.trace("recovery [phase1]: remote engine start took [{}]"; tookTime);
 }; e -> listener.onFailure(new RecoveryEngineException(shard.shardId(); 1; "prepare target for translog failed"; e)));
 // Send a request preparing the new shard's translog to receive operations. This ensures the shard engine is started and disables
 // garbage collection (not the JVM's GC!) of tombstone deletes.
 logger.trace("recovery [phase1]: prepare remote engine for translog");
 recoveryTarget.prepareForTranslogOperations(totalTranslogOps; wrappedListener);


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