Hecuba 2.1

C++

• Allow creation of StorageNumpy with different types (float, boolean and byte)

Hecuba 2.0

C++ interface

• Simplify user interface
• Remove yaml dependency
• Add Extrae instrumentation

Python

• Upgrade to 3.10

Documentation

• Update documentation for C++ interface
• Update README
• Add missing documentation on Python requirements
• Add documentation for c4s

ARROW

• Simplify deployment making ARROW optional: Add USE_ARROW compilation flag

StorageNumpy

• Add HECUBA_LAZY_WRITES to enable/disable lazy writes

Performance improvements

• Improve SYNC operation time.
• Improve-writer
• Use a single thread for write operations and a single table for
  StorageNumpys (HECUBA_SN_SINGLE_TABLE): new-writer-thread
  Create a static CacheTable to access StorageNumpys (for single table case)

C4S

• Allow to configure number of cores fo application and cassandra

Bug Fixing

• Fix an installation problem: fix-missing-storage-jar
• Fix an installation problem with missing '--prefix'
• Fix python arrow installation
• Fix install process
• Fix bug when processing attributes read from cassandra: fix bug in IStorage::extractMultiValuesFromQueryResult
• Fix a bug in IStorage::setCache
• Fix writes of a single column into cassandra
• Fix missing return value in attribute
• Add thread support to alive objects state
• Fix bug when disconnecting Cassandra
• Make sure Cassandra is available

Hecuba 1.2.4

Add missing python support for StorageStream class

Hecuba 1.2.3

Changelog

C++ interface

• Add C++ API
• Add support to write a single attribute in storageobj.

Stream interface

• Streaming tools deployment
• Add streaming API

API:

• Add 'sync' to API
• Modify split with optional parameter (cols=true/false)

Others:

• CREATE_SCHEMA to default true
• Change UUID generation (UUID3->UUID5)

Bugfixing

Hecuba 1.0

Changelog

• Major code refactoring and code optimization
• Improve ndarray management and compatibility with numpy library
• Add a synchronization interface
• Add support to concurrent creation
• Add experimental support to Arrow format (disabled by default)
• Improve automatic deployment on slurm based systems

Hecuba 0.1.3 Python 3

Change log

• Upgrade to Python 3
• Automated tests for Python versions 3.6 & up
• Tuples support None as one of their values #248
• Bug fixes

Hecuba 0.1.2 Python2.7

Change log

• New cache with low overhead #97 #234
• Timestamped writes to ensure serial updates #233
• StorageDict now supports deletes by key (del dict[key]) with coherency #98 #184
• Support for "None" Python objects, which are translated to "null" in Cassandra. #107 #170
• Persistent nested objects fully supported (e.g StorageDict of StorageObj) #123 #126 #135 #139 #190
• Travis automation and integration, building wheels too #129 #247
• Codecoverage integration #247
• Multinode testing: Python tests include their own Cassandra cluster with CCM. #243
• Changes in StorageNumpy are persisted, and basic operations supported #134
• Method splitnow takes into account Cassandra Virtual nodes for data locality #243
• Update integration with Qbeast #226 #231
• Enhanced filter on persistent objects which now adheres to Python's syntax #221
• Update CQL syntax to be compatible with ScyllaDB #174
• Add support for tuple data types #222
• Add support for sets (with restrictions) #203 #211
• Cassandra C++ Driver can be tuned with environment variables #182
• Bug fixes

Updated PyCOMPSs compability

Change log

• StorageDict returns KeyError when key not found
• Fixed StorageItf implementation
• Fixed dependency loop in storage.api.getByID
• Updated tests to compensate cache incoherence

Tempting alpha release

Dropped unstable features as numpy support and nested storage objects.