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Apache UIMA DUCC v2.1.0发布，分布式 UIMA 集群计算服务

UIMA (Unstructured Information Management applications) 是一个软件系统，用来分析大量的非结构化信息从而发掘中对最终用户有用的知识点，一个最典型的 UIM 应用就是从文本文件中提取有用信息，例如人员、地址和组织等相关信息。 DUCC 是为分布式 UIMA 集群计算服务的，是集群管理系统，提供工具链，管理和调度设施。

更新日志

完整日志：here

此版本中的主要变化是:

Ubuntu and RHEL 7 support
cgroup enhancements
- uses standard cgroups organization
- supports cgroup swappiness setting, restricting any swapping if desired
DUCC state and history storage moved from flat files to Cassandra DB, reducing storage size 5x
Ships with the latest UIMA-AS v2.8.1
Ships with recent ActiveMQ v5.13.2
DUCC's UIMA-AS services support failover and ssl connectors
Many DUCC webpage improvements
Clear user display of DUCC classes and relation to machines
Robust handling of dynamic changes to DUCC class and nodepool definitions
Full support of nodepools with different quantum
DUCC broker access restricted to user ducc
Eliminate need for user home directories located on a shared filesystem
Built-in Job error handler programmable per job
Migration utility for DUCC updates
Change to vary-off behavior to facilitate cluster management
Horizontal stacking of services instance allocations
java-viaducc improvements including separation of stdout from stderr respoonses
An alert banner is displayed on ducc-mon pages if daemons are down
Promoted DUCC from sandbox to the regular Apache project in the SVN