micro/go-micro · error

Error reading from store

Error message

Error reading from store

What it means

evStore.Read reads event records from the underlying store (memory store, optionally backed up) using the topic as a key prefix. This error wraps any error the store returns during that Read call, meaning the records could not be fetched from the storage backend.

Source

Thrown at events/store.go:64

	}

	// parse the options
	options := ReadOptions{
		Offset: 0,
		Limit:  250,
	}
	for _, o := range opts {
		o(&options)
	}

	// execute the request
	recs, err := s.store.Read(topic+joinKey,
		store.ReadPrefix(),
		store.ReadLimit(options.Limit),
		store.ReadOffset(options.Offset),
	)
	if err != nil {
		return nil, errors.Wrap(err, "Error reading from store")
	}

	// unmarshal the result
	result := make([]*Event, len(recs))
	for i, r := range recs {
		var e Event
		if err := json.Unmarshal(r.Value, &e); err != nil {
			return nil, errors.Wrap(err, "Invalid event returned from stroe")
		}
		result[i] = &e
	}

	return result, nil
}

// Write an event to the store
func (s *evStore) Write(event *Event, opts ...WriteOption) error {
	// parse the options

View on GitHub (pinned to 24529f1404)

Solutions

1. Check errors.Cause(err) for the backend-specific failure
2. Verify the backing store service is reachable and credentials are correct
3. If using a custom store plugin, confirm it supports prefix reads with limits and offsets
4. Fall back to or restart with the default memory store to isolate the backend issue
5. Add retry/backoff around Read for transient backend errors

Example fix

// before
recs, err := s.store.Read(topic+"/", store.ReadPrefix())
// fails against a remote store that is down
// after
if err != nil {
    if isTransient(errors.Cause(err)) {
        backoff.Retry(func() error { _, err = s.store.Read(...); return err }, policy)
    }
}

// check backend reachability before reading
if pinger, ok := backend.(interface{ Ping() error }); ok {
    if err := pinger.Ping(); err != nil { return err }
}

recs, err := evStore.Read(topic)
if err != nil {
    if strings.Contains(err.Error(), "Error reading from store") {
        cause := errors.Cause(err)
        // retry transient backend errors, otherwise surface config problem
        log.Printf("store read failed: %v", cause)
    }
    return err
}

When it happens

Trigger: Calling evStore.Read(topic, ...) when the backing store backend fails: a remote store (e.g. cockroach/redis store plugin) is unreachable, the store was closed, or the store implementation rejects the prefix read (e.g. key/option restrictions in custom store implementations).

Common situations: Store plugin (redis, cockroach, etc.) credentials wrong or service down; using a store backend that doesn't support ReadPrefix/ReadOffset options; store connection pool exhausted under load.

Related errors

• flow %s checkpoint save: %w
• Error writing to the store
• unsupported statement
• not found
• agent %s checkpoint save: %w

AI-assisted analysis of micro/go-micro@24529f1404 (2026-09-01). Data as JSON: /api/errors/dd3a692b2e24995e. Report an issue: GitHub.