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| <head> |
| <title>Apache Distributed UIMA Cluster Computing (DUCC) 2.2.1 Release Notes</title> |
| </head> |
| <body> |
| <h1>Apache UIMA-DUCC (Unstructured Information Management Architecture - Distributed UIMA Cluster Computing ) v.2.2.1 Release Notes</h1> |
| |
| <h2>Contents</h2> |
| <p> |
| <a href="#what.is.uima-ducc">1. What is UIMA-DUCC?</a><br/> |
| <a href="#major.changes">2. Major Changes in this Release</a><br/> |
| <a href="#migration">3. Migration from a Prior Release</a><br/> |
| <a href="#migration">4. Limitations</a><br/></p> |
| |
| <h2><a name="what.is.uima-ducc">1. What is UIMA-DUCC?</a></h2> |
| <p> |
| DUCC stands for Distributed UIMA Cluster Computing. DUCC is a cluster management system providing tooling, |
| management, and scheduling facilities to automate the scale-out of applications written to the UIMA framework. |
| Core UIMA provides a generalized framework for applications that process unstructured information such as human |
| language, but does not provide a scale-out mechanism. UIMA-AS provides a scale-out mechanism to distribute UIMA |
| pipelines over a cluster of computing resources, but does not provide job or cluster management of the resources. |
| DUCC defines a formal job model that closely maps to a standard UIMA pipeline. Around this job model DUCC |
| provides cluster management services to automate the scale-out of UIMA pipelines over computing clusters. |
| </p> |
| |
| <h2><a name="major.changes">2. Major Changes in this Release</a></h2> |
| <p> |
| Apache UIMA DUCC 2.2.1 is a maintenance release containing new features and bug fixes. What's new:<br> |
| |
| <ul> |
| <li>The userid of a privileged DUCC installation does not have to be "ducc"</li> |
| <li>ducc-mon login can be used on systems where users do not have password login</li> |
| <li>The DUCC head-node daemons may be moved to another host without breaking working applications</li> |
| <li>The deployment descriptor for a UIMA-AS service can be loaded from the classpath</li> |
| <li>Interactive applications run correctly with viaducc (fixed lost inputs)</li> |
| <li>Files created by DUCC jobs inherit the permissions of the launching shell's umask.</li> |
| <li>DUCC performance breakdown for scaled synchronous pipelines is now correct</li> |
| </ul> |
| |
| <br><br> |
| |
| For a complete list of issues fixed and up-to-date information on UIMA-DUCC issues, see our issue tracker: |
| <a href="https://issues.apache.org/jira/issues/?jql=project%20%3D%20UIMA%20AND%20fixVersion%20%3D%20%222.2.1-Ducc%22%20">https://issues.apache.org/jira/issues/?jql=project%20%3D%20UIMA%20AND%20fixVersion%20%3D%20%222.2.1-Ducc%22%20</a> |
| |
| This version of DUCC includes UIMA-SDK v.2.9.0, UIMA-AS v.2.9.0, and ActiveMQ v.5.14.0. |
| </p> |
| |
| <h2><a name="migration">3. Migration from a Prior Release</a></h2> |
| |
| When upgrading from an existing installation the ducc_update script may be used to replace the system files while leaving the site-specific configuration files in place. For more information see <strong>ducc_update</strong> in the Administrative Commands section of the DuccBook. |
| |
| <p> |
| </p> |
| <h2><a name="limitations">4. Limitations</a></h2> |
| On some systems cgroups swap accounting is not enabled and duccmon will show N/A for swap. To |
| confirm, please check memory.stat file in <cgroups base dir>/ducc/ folder. If swap accounting is |
| enabled there should be "swap" property defined. If it's missing, you need to add a kernel parameter |
| swapaccount=1. Details of how to do this can be found <a href="http://unix.stackexchange.com/questions/147158/how-to-enable-swap-accounting-for-memory-cgroup-in-archlinux">here</a>. |
| |
| Due to a bug in uima sdk, the uima AnalysisEngineProcessException cannot be serialized as a Java object. If your |
| analysis engine throws an exception in process(), the ducc framework will stringify it and wrapt it in |
| java RuntimeException. If you have a custom error handler plugged in into a job driver you will not be |
| able to test for AnalysisEngineProcessException in a stack trace with a code like this: |
| |
| if ( error instanceof AnalysisEngineProcessException ) ... |
| |
| |
| </body> |
| </html> |