Failed to clean up old index blobs from before – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.1-8.2

Briefly, this error occurs when Elasticsearch tries to delete old index blobs (binary large objects) but fails due to issues like insufficient permissions, disk space, or network connectivity. To resolve this, you can check and adjust the permissions of the Elasticsearch directory, ensure there’s enough disk space, and verify network connectivity. Also, check the Elasticsearch logs for more detailed error messages that can help pinpoint the issue. If the problem persists, consider manually deleting the old index blobs, but be careful not to delete any data that’s still needed.

This guide will help you check for common problems that cause the log ” Failed to clean up old index blobs from before [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, blobstore, repositories.

Log Context

Log “Failed to clean up old index blobs from before [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                LongStream.range(Math.max(Math.max(expectedGen - 1; 0); newGen - 1000); newGen)
                                    .mapToObj(gen -> INDEX_FILE_PREFIX + gen)
                        } catch (IOException e) {
                            logger.warn(() -> new ParameterizedMessage("Failed to clean up old index blobs from before [{}]"; newGen); e);
                        return newRepositoryData;
            }; newExecutor());


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