# Chunks

Chunks process jobs in groups based on size or timeout. Use for bulk operations and batched API calls.

```elixir
defmodule MyApp.BulkIndexer do
  use Oban.Pro.Chunk, size: 100, timeout: 5_000

  @impl true
  def process([_ | _] = jobs) do
    jobs
    |> Enum.map(& &1.args["document"])
    |> MyApp.Search.bulk_index()

    :ok
  end
end
```

## Options

- `size: 100` — process up to 100 jobs at once (default)
- `timeout: 1000` — process after 1 second even if size not reached (default)
- `by: [args: :tenant_id]` — partition chunks by field

## Return values

```elixir
:ok                           # All jobs succeeded
{:ok, result}                 # All jobs succeeded with result
{:error, reason, failed_jobs} # Some jobs failed, others succeed
{:cancel, reason, jobs}       # Cancel specific jobs
{:snooze, seconds, jobs}      # Snooze specific jobs
```