# DataCollection.parallel

```python
coinmetrics._data_collection.DataCollection.parallel(
    parallelize_on=None,
    executor=None,
    max_workers=None,
    progress_bar=None,
    time_increment=None,
    height_increment=None,
)
```

Convert this [`DataCollection`](https://gitbook-docs.coinmetrics.io/python-api-client/reference/data-collection/pages/4SxAThvJEKszVwNAKU88#coinmetrics._data_collection.DataCollection) into a [`ParallelDataCollection`](https://gitbook-docs.coinmetrics.io/python-api-client/reference/data-collection/pages/eQIronmREyzwFm5VAeq6#coinmetrics._data_collection.ParallelDataCollection), splitting a single HTTP request into many parallel requests for faster data export.

By default the request is split on the primary query parameter (for example, `get_asset_metrics(assets=...)` is split into one request per asset).

* **Parameters:**
  * **parallelize\_on** (*Optional* \*\[\**Union* *\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str) *,* *List* *\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str) *]* *]* *]*) -- Parameter(s) to parallelize on. Must be one of the list-type parameters of the underlying endpoint (`assets`, `markets`, `metrics`, ...).
  * **executor** (*Optional* \*\[\**Callable* *\[* \*\[\**Any* *]* *,* [*concurrent.futures.Executor*](https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Executor) *]* *]*) -- Executor class used for concurrency. Defaults to [`concurrent.futures.ThreadPoolExecutor`](https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.ThreadPoolExecutor); pass a [`ProcessPoolExecutor`](https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.ProcessPoolExecutor) (or any other `Executor` subclass) to swap it out.
  * **max\_workers** (*Optional* *\[*[*int*](https://docs.python.org/3/library/functions.html#int) *]*) -- Number of parallel workers. Defaults to `10` and is capped at `10` to respect API rate limits.
  * **progress\_bar** (*Optional* *\[*[*bool*](https://docs.python.org/3/library/functions.html#bool) *]*) -- Whether to display a `tqdm` progress bar while the workers run. Defaults to `True`.
  * **time\_increment** (*Optional* \*\[\**Union* \*\[\**relativedelta* *,* *timedelta* *,* *DateOffset* *]* *]*) -- Optionally split the request along the time axis as well. Use [`datetime.timedelta`](https://docs.python.org/3/library/datetime.html#datetime.timedelta) for sub-month windows and `dateutil.relativedelta.relativedelta` for month / year windows. Requires `start_time` to be set on the original request.
  * **height\_increment** (*Optional* *\[*[*int*](https://docs.python.org/3/library/functions.html#int) *]*) -- Optionally split the request along the block-height axis. Requires `start_height` to be set on the original request.
* **Returns:** A [`ParallelDataCollection`](https://gitbook-docs.coinmetrics.io/python-api-client/reference/data-collection/pages/eQIronmREyzwFm5VAeq6#coinmetrics._data_collection.ParallelDataCollection) that mirrors the original request but executes its workload across multiple workers.

**Returns:**

* [ParallelDataCollection](https://gitbook-docs.coinmetrics.io/python-api-client/reference/data-collection/pages/eQIronmREyzwFm5VAeq6#coinmetrics._data_collection.ParallelDataCollection)


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