Cant calculate hash from blog 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 analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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


Log Context

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

                     // don't have this hash we try to read that hash from the blob store
                    // in a bwc compatible way.
                    maybeRecalculateMetadataHash(fileInfo; recoveryTargetMetadata);
                } catch (Exception e) {
                    // if the index is broken we might not be able to read it
                    logger.warn(new ParameterizedMessage("[{}] Can't calculate hash from blog for file [{}] [{}]"; shardId;
                        fileInfo.physicalName(); fileInfo.metadata()); e);
                }
                snapshotMetaData.put(fileInfo.metadata().name(); fileInfo.metadata());
                fileInfos.put(fileInfo.metadata().name(); fileInfo);
            }




 

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