Apache UIMA DUCC 2.2.1 发布，Bug 修复版本
>>>https://my.oschina.net/img/hot3.pngApache UIMA DUCC 2.2.1 发布，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。
此版本带来了一些改进和 bug 修复：
[*] The userid of a privileged DUCC installation does not have to be "ducc"
[*] ducc-mon login can be used on systems where users do not have password login
[*] The DUCC head-node daemons may be moved to another host without breaking working applications
[*]
The deployment descriptor for a UIMA-AS service can be loaded from the>
[*] Interactive applications run correctly with viaducc (fixed lost inputs)
[*] Files created by DUCC jobs inherit the permissions of the launching shell's umask.
[*] DUCC performance breakdown for scaled synchronous pipelines is now correct
[*] Fixed javadoc method headers to enable ducc build with java 8
[*] Fixed JP communication threads wait logic when JD returns no work
[*] GC stats not available sometimes from remote JP
详细改进请看：
https://uima.apache.org/d/uima-ducc-2.2.1/issuesFixed/jira-report.html
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。
下面是 UIMA 的结构图：
https://static.oschina.net/uploads/img/201103/24072920_6eqt.png
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