{"record":{"id":"fb935ac906e555fb","repo":"benbjohnson/litestream","slug":"check-remote-position-w","errorCode":null,"errorMessage":"check remote position: %w","messagePattern":"check remote position: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"vfs.go","lineNumber":2068,"sourceCode":"\t// Clear dirty pages\n\tf.dirty = make(map[uint32]int64)\n\n\t// Clear write buffer after successful sync\n\tif err := f.clearWriteBuffer(); err != nil {\n\t\tf.logger.Error(\"failed to clear write buffer\", \"error\", err)\n\t\treturn fmt.Errorf(\"clear write buffer: %w\", err)\n\t}\n\n\treturn nil\n}\n\n// checkForConflict checks if the remote has newer transactions than expected.\n// Must be called with f.mu held.\nfunc (f *VFSFile) checkForConflict(ctx context.Context) error {\n\t// Get latest remote position\n\titr, err := f.client.LTXFiles(ctx, 0, f.expectedTXID, false)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"check remote position: %w\", err)\n\t}\n\tdefer itr.Close()\n\n\tvar remoteTXID ltx.TXID\n\tfor itr.Next() {\n\t\tinfo := itr.Item()\n\t\tif info.MaxTXID > remoteTXID {\n\t\t\tremoteTXID = info.MaxTXID\n\t\t}\n\t}\n\tif err := itr.Close(); err != nil {\n\t\treturn fmt.Errorf(\"iterate remote files: %w\", err)\n\t}\n\n\t// If remote has advanced beyond our expected position, we have a conflict\n\tif remoteTXID > f.expectedTXID {\n\t\tf.logger.Warn(\"conflict detected\",\n\t\t\t\"expected\", f.expectedTXID,","sourceCodeStart":2050,"sourceCodeEnd":2086,"githubUrl":"https://github.com/benbjohnson/litestream/blob/4ed7a308f6271ebfd2b0a6e4b70b03011a37e4a3/vfs.go#L2050-L2086","documentation":"checkForConflict lists the remote LTX files at level 0 starting from the expected TXID to determine the remote replication position. If f.client.LTXFiles() fails, the conflict check cannot run, so sync aborts with this wrapped error. It indicates the replica client could not enumerate remote objects (network, credentials, storage backend error).","triggerScenarios":"During sync, remote position check calls client.LTXFiles(ctx, 0, expectedTXID, false) and the storage backend returns an error: network outage, expired/invalid credentials, bucket/missing container, rate limiting, or S3-compatible API error.","commonSituations":"Transient cloud-storage outages (S3 5xx); rotated access keys not yet updated in config; wrong bucket/container name; corporate proxy or firewall blocking egress; provider rate limits during heavy compaction.","solutions":["Read the wrapped underlying error: if it is an HTTP/auth error, verify replica credentials and bucket/container config first.","Retry the sync — LTXFiles failures during transient network/storage outages are typically recoverable.","Confirm the replica client configuration (endpoint, region, bucket) with a read-only listing (e.g. litestream ltx) against the same storage.","Check provider status pages / rate limits if errors cluster during compaction windows."],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// verify remote reachability before relying on sync\nitr, err := client.LTXFiles(ctx, 0, 0, false)\nif err != nil { return fmt.Errorf(\"replica unreachable: %w\", err) }\nitr.Close()","typeGuard":null,"tryCatchPattern":"err := db.Sync(ctx)\nif err != nil && strings.Contains(err.Error(), \"check remote position\") {\n    return retry.WithBackoff(ctx, 3, db.Sync) // transient storage errors\n}","preventionTips":["Validate replica credentials and bucket config at startup with a test listing","Set sensible HTTP timeouts for the replica client","Monitor provider status/rate limits during compaction windows"],"tags":["go","network","storage","replication"],"backgroundTag":"network-request-failed","analyzedSha":"4ed7a308f6271ebfd2b0a6e4b70b03011a37e4a3","analyzedAt":"2026-09-06T18:29:25.564Z","contentChangedAt":"2026-09-06T18:29:25.564Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}