VictoriaMetrics/VictoriaMetrics · error

cannot obtain the next block to search in the table: %w

Error message

cannot obtain the next block to search in the table: %w

What it means

TableSearch.NextBlock advances the search to the next block. When the internal nextBlock() returns an error other than io.EOF, it is stored in ts.err and wrapped with this message; io.EOF is kept unwrapped as the normal end-of-stream signal. Callers should check ts.err after NextBlock returns false.

Source

Thrown at lib/storage/table_search.go:132

}

// NextBlock advances to the next block.
//
// The blocks are sorted by (TSID, MinTimestamp). Two subsequent blocks
// for the same TSID may contain overlapped time ranges.
func (ts *tableSearch) NextBlock() bool {
	if ts.err != nil {
		return false
	}
	if ts.nextBlockNoop {
		ts.nextBlockNoop = false
		return true
	}

	ts.err = ts.nextBlock()
	if ts.err != nil {
		if ts.err != io.EOF {
			ts.err = fmt.Errorf("cannot obtain the next block to search in the table: %w", ts.err)
		}
		return false
	}
	return true
}

func (ts *tableSearch) nextBlock() error {
	ptsMin := ts.ptsHeap[0]
	if ptsMin.NextBlock() {
		heap.Fix(&ts.ptsHeap, 0)
		ts.BlockRef = ts.ptsHeap[0].BlockRef
		return nil
	}

	if err := ptsMin.Error(); err != nil {
		return err
	}

View on GitHub (pinned to 5079fb58f1)

Solutions

1. Check ts.err and confirm it is not io.EOF; inspect the wrapped cause.
2. Verify storage health (disk errors, free space) and file integrity.
3. Restore/rebuild the affected partition from backup or a repair process.
4. Re-run the query after fixing the underlying storage problem.

Example fix

// before
for ts.NextBlock() {
    process(ts.Block)
}
// no check for ts.err — real failures look like normal end of iteration
// after
for ts.NextBlock() {
    process(ts.Block)
}
if ts.err != nil && ts.err != io.EOF {
    return fmt.Errorf("search failed: %w", ts.err)
}

func searchFailed(ts *storage.TableSearch) bool {
    err := ts.Err()
    return err != nil && !errors.Is(err, io.EOF)
}

for ts.NextBlock() {
    process(ts.Block)
}
if err := ts.Err(); err != nil && !errors.Is(err, io.EOF) {
    return fmt.Errorf("query aborted: %w", err)
}

When it happens

Trigger: Iterating a TableSearch (NextBlock in a loop via NextMetricBlock) when the underlying partition search hits an unexpected error mid-iteration — I/O failure or corrupted block data — rather than a clean EOF.

Common situations: Long queries interrupted by disk errors; corrupted compressed blocks in a partition after a crash; storage files removed or truncated while a query is running.

Related errors

• error when searching for tag filter prefix %q: %w
• cannot complete forced merge for partition %q: %w
• cannot initialize table search: %w
• error when processing imported data: %w
• cannot read next block: %w

AI-assisted analysis of VictoriaMetrics/VictoriaMetrics@5079fb58f1 (2026-09-03). Data as JSON: /api/errors/1b1e9dc06ab1b3fc. Report an issue: GitHub.