%s %s failed to delete temporary files snapshot upgrade – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

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Briefly, this error occurs when Elasticsearch struggles to delete temporary files created during a snapshot upgrade. This could be due to insufficient permissions, disk space issues, or a process locking the files. To resolve this, ensure Elasticsearch has the necessary permissions to delete files in the directory. Check if there’s enough disk space and free up space if needed. Also, identify and stop any processes that might be locking the files. Lastly, consider restarting Elasticsearch to clear any temporary locks.

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This guide will help you check for common problems that cause the log ” [%s] [%s] failed to delete temporary files snapshot upgrade ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, delete, upgrade, snapshot.

Log Context

Log “[%s] [%s] failed to delete temporary files snapshot upgrade” classname is JobModelSnapshotUpgrader.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            (reason) -> {
                setTaskToFailed(reason; ActionListener.wrap(t -> {}; task::markAsFailed));
                try {
                } catch (IOException e) {
                    logger.error(() -> format("[%s] [%s] failed to delete temporary files snapshot upgrade"; jobId; snapshotId); e);
        processor = new JobSnapshotUpgraderResultProcessor(jobId; snapshotId; jobResultsPersister; process);
        ProcessWorkerExecutorService autodetectWorkerExecutor;


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