thanos-io/thanos · error

get attr of

Error message

get attr of %v

What it means

Wraps bkt.Attributes when the TSDB-based planner needs the index file size of a planned block that lacks a recorded file entry in its Thanos metadata. Querying the object for <block>/index attributes failed (network/auth error or missing object), so the size-based compaction heuristic cannot rank blocks.

Solutions

1. Check bucket connectivity and credentials.
2. Verify the index object exists in the bucket for that block ULID.
3. Retry; transient object-store errors are common here.

When it happens

Trigger: Thrown at pkg/compact/planner.go:333 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of thanos-io/thanos@35b8b99117 (2026-09-07). Data as JSON: /api/errors/f0a79e52b0119a56. Report an issue: GitHub.

Appendix: source

Thrown at pkg/compact/planner.go:333

	for {
		plan, err := t.tsdbBasedPlanner.plan(copiedNoCompactMarked, metasByMinTime)
		if err != nil {
			return nil, err
		}
		var totalIndexBytes, maxIndexSize int64 = 0, math.MinInt64
		var biggestIndex int
		for i, p := range plan {
			indexSize := int64(-1)
			for _, f := range p.Thanos.Files {
				if f.RelPath == block.IndexFilename {
					indexSize = f.SizeBytes
				}
			}
			if indexSize <= 0 {
				// Get size from bkt instead.
				attr, err := t.bkt.Attributes(ctx, filepath.Join(p.ULID.String(), block.IndexFilename))
				if err != nil {
					return nil, errors.Wrapf(err, "get attr of %v", filepath.Join(p.ULID.String(), block.IndexFilename))
				}
				indexSize = attr.Size
			}

			if maxIndexSize < indexSize {
				maxIndexSize = indexSize
				biggestIndex = i
			}
			totalIndexBytes += indexSize
			// Leave 15% headroom for index compaction bloat.
			if totalIndexBytes >= int64(float64(t.totalMaxIndexSizeBytes)*0.85) {
				// Marking blocks for no compact to limit size.
				// TODO(bwplotka): Make sure to reset cache once this is done: https://github.com/thanos-io/thanos/issues/3408
				if err := block.MarkForNoCompact(
					ctx,
					t.logger,
					t.bkt,
					plan[biggestIndex].ULID,

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