Failed to delete file during snapshot cleanup – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to delete a file during the cleanup process of a snapshot. This could be due to insufficient permissions, a locked file, or a network issue. To resolve this, you can try the following: 1) Check and adjust the file permissions to ensure Elasticsearch has the necessary access. 2) Ensure the file is not being used or locked by another process. 3) If the snapshot is stored on a remote server, verify the network connection and the server’s status.

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

Log Context

Log “[{}] [{}] failed to delete file [{}] during snapshot cleanup” classname is FileRestoreContext.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    // snapshots of immutable directories either only contain an empty `segments_N` file or no data at all;
                    // since the data lives elsewhere; and if we restore such a snapshot then the real data is already present
                    // in the directory and cannot be removed.
                    assert snapshotFiles.indexFiles().size() 

 

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