Exception while deleting generation – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.5

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Briefly, this error occurs when OpenSearch encounters an issue while trying to delete a specific generation of data. This could be due to a variety of reasons such as insufficient permissions, a locked file, or a network issue. To resolve this, you could try checking the user permissions to ensure that OpenSearch has the necessary rights to delete the file. If the file is locked, try unlocking it or restarting the OpenSearch service. If it’s a network issue, ensure that the network connection is stable and reliable.

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This guide will help you check for common problems that cause the log ” Exception {} while deleting generation {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Exception {} while deleting generation {}” classname is RemoteFsTranslog.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    void deleteReaderFiles(TranslogReader reader) {
        try {
            translogTransferManager.deleteTranslog(primaryTermSupplier.getAsLong(); reader.generation);
        } catch (IOException ignored) {
            logger.error("Exception {} while deleting generation {}"; ignored; reader.generation);


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