Scalaris 0.4.0 codename "Pomacea scalaris" released
Florian Schintke
Scalaris 0.4.0 (codename "Pomacea scalaris")
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Changes include:
API:
- new functions for incremental data change:
test_and_set: check for a provided old value before setting a new one
add_on_nr: increment a numeric value
add_del_on_list: append or delete entries from a list value
- added VM API to manage Scalaris nodes inside an Erlang virtual machine
- added monitoring API to retrieve some live metrics
- added a connection pool convenience class (Java, Python)
Demonstrator "Wiki on Scalaris" (supported by 4CaaSt http://www.4caast.eu/):
- improved performance of page edits
- improved performance of Wikipedia dump loading
- several rendering fixes
Business Logic:
- improved handling of large values by reducing overhead of transaction
log handling (empty TLog after commit), no copy of value in TLog
returned to user after read requests)
- eliminated timeouts in data hand-over protocol (relies on fd now)
- added a DB subscribe mechanism, e.g. to become informed when locks
are freed
- fixed a strong consistency issue in the tx protocol
- gather some run-time statistics and expose them via the APIs and the
web debug interface
Infrastructure:
- support for Erlang 15B
- fd now also uses feedback from TCP layer
- made message sending more flexible (gets an option list)
- added and corrected several Erlang type specifications
- added scripts to create Scalaris images for OpenNebula
- added tools for using Scalaris as the Database as a Service
component in ConPaaS (http://www.conpaas.eu/) which is part of the
EU project Contrail (http://contrail-project.eu/)
- added a separate communication channel for priority messages, e.g. fd
(reduces falsely reported node crashes under heavy load)
Tests:
- added runtime type-checker for random testing extended unittests
Documentation:
- updated documentation to extended APIs
Bugs:
- fixed numerous bugs
Cheers,
Nico, Thorsten, Florian