arcae implements a limited subset of functionality from the more mature python-casacore package. It bypasses some existing limitations in python-casacore to provide safe, multi-threaded access to CASA formats, thereby enabling export into newer cloud native formats such as Apache Arrow and Zarr.

Rationale

casacore and the python-casacore Python bindings provide access to the CASA Table Data System (CTDS) and Measurement Sets created within this system. The CTDS, as of casacore 3.5.0 is subject to the following limitations:

Resolving these concerns is potentially a major effort, involving invasive changes across the CTDS system.

In the time since the CTDS was developed, newer, open-source formats such as Apache Arrow and Zarr have been developed that are suitable for representing Radio Astronomy data.

  • The Apache Arrow project defines a programming language portable in-memory columnar storage format.

  • Translating CTDS data to Arrow is relatively simple, with some limitations mentioned below.

  • It’s easy to convert Arrow Tables between many different languages

  • Once in Apache Arrow format, it is easy to store data in modern, cloud-native disk formats such as parquet and Zarr.

  • Converting CASA Tables to Arrow in the C++ layer avoids the GIL

  • Access to non thread-safe CASA Tables is constrained to a ThreadPool containing a single thread

  • It also allows us to write astrometry routines in C++, potentially side-stepping thread-safety and GIL issues with the CASA Measures server.

Limitations

Arrow supports both 1D arrays and nested structures:

  1. Fixed shape multi-dimensional data (i.e. visibility data) is currently represented as nested FixedSizeListArrays .

  2. Variably-shaped multi-dimensional (i.e. subtable data) is currently represented as nested ListArrays.

  3. Complex values are represented as an extra FixedSizeListArray nesting of two floats.

  4. Currently, it is not trivially trivial (repetition intended here) to convert between the above and numpy via to_numpy calls on Arrow Arrays, but it is relatively trivial to reinterpret the underlying data buffers from either API. This is done transparently in getcol and putcol functions (see usage below).

Going forward, FixedShapeTensorArray and VariableShapeTensorArray will provide more ergonomic structures for representing multi-dimensional data. First class support for complex values in Apache Arrow will require implementing a C++ extension type within Arrow itself:

Some other edge cases have not yet been implemented, but could be with some thought.

  • Columns with unconstrained rank (ndim == -1) whose rows, in practice, have differing dimensions. Unconstrained rank columns whose rows actually have the same rank are catered for.

  • Not yet able to handle TpRecord columns. Probably simplest to convert these rows to json and store as a string.

  • Not yet able to handle TpQuantity columns. Possible to represent as a run-time parametric Arrow DataType.

Installation

Binary wheels are providing for Linux and MacOSX for both x86_64 and arm64 architectures

$ pip install arcae

Usage

Example usage with Arrow Tables:

import json
from pprint import pprint

import arcae
import pyarrow as pa
import pyarrow.parquet as pq

# Obtain (partial) Apache Arrow Table from a CASA Table
casa_table = arcae.table("/path/to/measurementset.ms")
arrow_table = casa_table.to_arrow()        # read entire table
arrow_table = casa_table.to_arrow(index=(slice(10, 20),)
assert isinstance(arrow_table, pa.Table)

# Print JSON-encoded Table and Column keywords
pprint(json.loads(arrow_table.schema.metadata[b"__arcae_metadata__"]))
pprint(json.loads(arrow_table.schema.field("DATA").metadata[b"__arcae_metadata__"]))

pq.write_table(arrow_table, "measurementset.parquet")

Some reading and writing functionality from python-casacore is replicated, with added support for some NumPy Advanced Indexing.

casa_table = arcae.table("/path/to/measurementset.ms", readonly=False)
# Get rows 10 and 2, and channels 16 to 32, and all correlations
data = casa_table.getcol("DATA", index=([10, 2], slice(16, 32), None))
# Write some modified data back
casa_table.putcol("DATA", data + 1*1j, index=([10, 2], slice(16, 32), None))

See the test cases for further use cases.

Multi-threaded read support

When opening a CASA table, arcae can open multiple instances of the table in separate threads and multiplex read operations over them. This mode of operation is intended to saturate the number of I/O requests in-flight by submitting read operations from multiple threads:

import concurrent.futures as cf

table = arcae.table("/path/to/measurementset.ms", ninstances=8, readonly=True)
with cf.ThreadPoolExecutor(max_workers=8) as pool:
  nrow = table.nrow()
  futures = []
  for start_row in range(0, nrow, 10_000):
  nrow = min(10_000, nrow - start_row)
    futures.append(pool.submit(table.getcol, "DATA", startrow=start_row, nrow=nrow))

  with cf.as_completed(futures):
    ...

Multi-threaded write support

arcae only supports writing when a single instance of the table is opened (ninstances=1). Writing to a table when multiple instances are opened is an unsafe operation and arcae will error if this is attempted. Future versions of arcae may support this. In the meantime, the support for this ability can be inspected via the arcae.safe_multithread_writes function:

assert not arcae.safe_multithreaded_writes()

table = arcae.table("/path/to/measurementset.ms", ninstances=8, readonly=False)
table.putcol("DATA", ...)  # Fails, ninstances > 1

Bounding storage manager cache sizes

casacore’s Tiled Storage Managers use unbounded caches by default: reading a large Measurement Set lets the cache grow until it holds much of the MS in memory. Because arcae opens ninstances independent table instances, each with its own caches, this growth is multiplied by the instance count.

The cache_size argument to arcae.table bounds these caches. It accepts an integer shorthand, or a flat, prefixed dictionary offering three levels of granularity, resolved with precedence column: > stman: > default:

# Global default of 256 MiB for every storage manager
table = arcae.table("/path/to/measurementset.ms", cache_size=256)

# Fine-grained control
table = arcae.table("/path/to/measurementset.ms", cache_size={
    "default": 128,                # global default for unmatched columns
    "stman:TiledData": 256,        # per storage manager
    "column:WEIGHT_SPECTRUM": 32,  # per column
})

# Restore the historical unbounded behaviour
table = arcae.table("/path/to/measurementset.ms", cache_size=0)

Notes:

  • All sizes are in MiB.

  • None (the default) applies a bounded default of 128 MiB; 0 restores the historical unbounded behaviour.

  • A per-column cap physically targets that column’s storage manager (casacore caps the whole storage manager), so columns sharing a hypercolumn share the cap — last write wins.

  • The cap is applied to every opened instance, so the worst-case resident cache is roughly ninstances × (number of tiled storage managers) × cache_size MiB.

  • Unknown stman: / column: names, malformed keys, and non-integer or negative values are rejected with a clear error.

Exporting Measurement Sets to Arrow Parquet Datasets

Install the applications optional extra.

pip install arcae[applications]

Then, an export script is available:

$ arcae export /path/to/the.ms --nrow 50000
$ tree output.arrow/
output.arrow/
├── ANTENNA
│   └── data0.parquet
├── DATA_DESCRIPTION
│   └── data0.parquet
├── FEED
│   └── data0.parquet
├── FIELD
│   └── data0.parquet
├── MAIN
│   └── FIELD_ID=0
│       └── PROCESSOR_ID=0
│           ├── DATA_DESC_ID=0
│           │   ├── data0.parquet
│           │   ├── data1.parquet
│           │   ├── data2.parquet
│           │   └── data3.parquet
│           ├── DATA_DESC_ID=1
│           │   ├── data0.parquet
│           │   ├── data1.parquet
│           │   ├── data2.parquet
│           │   └── data3.parquet
│           ├── DATA_DESC_ID=2
│           │   ├── data0.parquet
│           │   ├── data1.parquet
│           │   ├── data2.parquet
│           │   └── data3.parquet
│           └── DATA_DESC_ID=3
│               ├── data0.parquet
│               ├── data1.parquet
│               ├── data2.parquet
│               └── data3.parquet
├── OBSERVATION
│   └── data0.parquet

This data can be loaded into an Arrow Dataset:

>>> import pyarrow as pa
>>> import pyarrow.dataset as pad
>>> main_ds = pad.dataset("output.arrow/MAIN")
>>> spw_ds = pad.dataset("output.arrow/SPECTRAL_WINDOW")

Etymology

Noun: arca f (genitive arcae); first declension A chest, box, coffer, safe (safe place for storing items, or anything of a similar shape)

Pronounced: ar-ki.

Project links

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Credits

Author: Simon Perkins

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Data verified by PyPI on Jul 22, 2026
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Python >=3.11

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Release history Release notifications | RSS feed

This release

0.5.4 This release

17 files

0.5.3

17 files

0.5.2

17 files

0.5.1

17 files

0.5.0

17 files

Pre-release

0.4.0a8

17 files

Pre-release

0.4.0a7

17 files

Pre-release

0.4.0a6

17 files

Pre-release

0.4.0a5

17 files

Pre-release

0.4.0a4

17 files

Pre-release

0.4.0a3

17 files

Pre-release

0.4.0a2

17 files

Pre-release

0.4.0a1

17 files

0.3.3

17 files

0.3.2

17 files

Yanked

0.3.1

17 files

Yanked reason: Bugs related to missing row handling

0.3.0

17 files

0.2.9

13 files

0.2.8

13 files

0.2.7

13 files

0.2.6

13 files

0.2.5

13 files

0.2.4

17 files

0.2.3

17 files

0.2.2

5 files

0.2.1

5 files

0.2.0

5 files

0.1.0

5 files

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