Cant calculate hash from blob for file – How to solve related issues

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Cant calculate hash from blob for file – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Cant calculate hash from blob for file ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: blobstore, repositories and repository-azure.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “{} Can’t calculate hash from blob for file [{}] [{}]” classname is BlobStoreRepository.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                 // to ensure we don't double the space in the repo since old snapshots
                                // don't have this hash we try to read that hash from the blob store
                                // in a bwc compatible way.
                                maybeRecalculateMetadataHash(blobContainer; fileInfo; metadata);
                            } catch (Exception e) {
                                logger.warn(() -> new ParameterizedMessage("{} Can't calculate hash from blob for file [{}] [{}]";
                                    shardId; fileInfo.physicalName(); fileInfo.metadata()); e);
                            }
                            if (fileInfo.isSame(md) && snapshotFileExistsInBlobs(fileInfo; blobs)) {
                                // a commit point file with the same name; size and checksum was already copied to repository
                                // we will reuse it for this snapshot




 

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