INC-169125 · Issue 642400
Nodes resume correctly after DDS restart
Resolved in Pega Version 8.5.4
A corner case issue in VBD's code for handling a DDS session was preventing the nodes from recovering correctly after a system shutdown. As part of the process for an event which fires if all DDS nodes are taken down or as part of a switch from embedded to external Cassandra, VBD's cache is invalidated and then re-initialized once new VBD API calls are received or on the VBD service pulse. In this case, the invalidation of the cache did not complete due to logic in the VBD code that can lead to executing a Cassandra query that will not work in the case of all DDS nodes being down. This has been resolved by modifying the handling of a session change event to eliminate inadvertent Cassandra queries so the invalidation can complete correctly and continue the re-initialization process.
INC-169544 · Issue 649539
Enhancement for MaxEnt modeling data
Resolved in Pega Version 8.5.4
An enhancement has been added to create output for the model coefficients, the term frequency, and the inverse term frequency for use in maximum entropy modeling. For MRM processes, every Maximum Entropy (Maxent) based topic model will contain two additional stats resources. These resources can be used to validate and replicate running of topic model outside of Pega. The resources are: 1) Term Frequency file – A CSV file with all words used for training and their cumulative frequency across training set. File name format – TRAINING_DATA_TERM_FREQUENCY_< RandomNumber >.csv olumns – Word, Count 2) Coefficient file – A CSV file with all features (words, taxonomy matches and category matches) and model learnt weights for each topic across training set. File name format – MAXENT_COEFFICIENT_VALUE.csv Columns – Feature, < TopicName1 >, < TopicName2 > ,…, < TopicNameK >
INC-170149 · Issue 645724
pzTenantID removed from Revision management classes
Resolved in Pega Version 8.5.4
After upgrade, issues were seen with case types in the case explorer. This was caused by the Revision management work classes created in the 7.1.x version having pzTenantId property in the rule XML when it was not defined anywhere in the 8.x versions, and has been resolved by removing the pzTenantId property from the Revision management classes.
INC-171221 · Issue 645988
Queue Processors made more robust
Resolved in Pega Version 8.5.4
After upgrade, multiple queue processors were not running as expected. Attempting to restart them generated an error. Investigation showed that the real time data flow runs were not picking up or accepting assignments because the local node was under the impression it was still processing data. In this case, the need to synchronize the state of multiple threads caused the queue processors to become stuck in an initializing state due to a race condition that caused the data flow engine to think this run still had threads running when all threads were already stopped. To resolve this, the callback handling has been simplified and made more robust. In addition, in some cases the data flow leader node would believe the service nodes did not accept assignments even when they did. This occurred if many runs and nodes were involved, and was traced to an implicit limit on the NativeSQL query used to read the data to see which assignments were accepted. To resolve this, the key-value store in the Service Registry has been modified to allow a query of more than 500 entries at once.
INC-174933 · Issue 651827
Special characters escaped for use in "is in List" lookups
Resolved in Pega Version 8.5.4
After creating a specific criterion on any proposition using a string property, the "Is In List" operator, and a customer list with one value containing a "$", clicking save or check in resulted in the exception error "Problem invoking function: pega_decisionengine_propositionfilterfua.pzPropositionFilterMethodBody--(PublicAPI,ClipboardPage) java.lang.IllegalArgumentException: Illegal group reference at java.util.regex.Matcher.appendReplacement(Matcher.java:857) ". This has been resolved by escaping regular expression control characters in string replacement, which will allow the use of characters such as the $ sign for "is in List" lookups.
SR-D16934 · Issue 493702
External Cassandra nodes listed in DDS cluster
Resolved in Pega Version 8.3.1
Nodes of an external Cassandra cluster were not listed in the DDS cluster except for the first one in the host list, and when the “only” listed Cassandra node was restarted, the status on the DDS cluster LP did not become “NORMAL” afterwards. In addition, even though other C* nodes were up and running, the external Cassandra cluster was reported as unreachable. This was an unintended side effect of work done on the landing page to reflect the real state of the nodes after some were killed and restarted, and has been corrected by refining the equals() and hashCode() methods for DDS member info in order to better differentiate the external Cassandra nodes.
SR-D22686 · Issue 493516
IH summaries working with external Cassandra
Resolved in Pega Version 8.3.1
Summaries were not working for external Cassandra. This was an issue with the IH summary component using the aggregated dataset as a reference, and this fix contains several components to improve this function. An issue where the IH aggregates dataset does not materialize when DDS is external Cassandra has been resolved by modifying the code that checks the DDS availability. A filter that was used to match “” did not work when pre-aggregation is off : this was due to the IH Browse operation being done outside of a DF context, and has been fixed. The IH Summary shape not working properly in a strategy if it referenced an aggregate dataset with pxInteractionID as part of the group-by properties was traced to an issue with it generating a pxInteractionID value when executing the strategy, and has been resolved by excluding pxInteractionID from the group keys in the IH Summary shape.
SR-D24880 · Issue 494171
CEP bucket size increased to 1 minute
Resolved in Pega Version 8.3.1
Frequent DSM Data Flow Errors were observed in production nodes with very high event rates. This was traced to the default bucket size for CEP being 1 second for a 31 day window, which was not sufficient to handle high volume use which may create an event strategy window large enough to hit the Cassandra column size limit. In order to resolve this, the default bucket size has been increased from 1 second to 1 minute.
SR-D25184 · Issue 494689
Support added for referencing Page Group property inside of strategy
Resolved in Pega Version 8.3.1
Referencing a page property under Page Group property inside a strategy resulted in a runtime error of ClassCasting: "java.lang.ClassCastException: java.util.ArrayList cannot be cast to com.pega.decision.strategy.ssa.runtime.ClipboardPage". The issue was traced to the SSA optimized code for the GetPage SSA assuming that the GetPage SSA would only have another page as a parent. In order to handle the above scenario where GetPage would have a GetPageCollection as a parent and return a List of ClipboardPages, a GetPage function has been applied over each entry in the results of the GetPageCollection SSA using a MapAction SSA. Some optimizations will be applied in cases where the GetPageCollection has only one entry, which will replace the MapAction with a simple GetPage action.
SR-D26010 · Issue 500163
Modified VBD insertion logic to improve handling
Resolved in Pega Version 8.3.1
An issue with not being able to launch an additional VDB node was traced to two processes inserting into VBD with different field signatures and triggering unnecessary object creation. This was amplified when adding a second node as the objects were serialized. To resolve this, the insertion logic has been modified to avoid creating new data container/field descriptors after a new field is included, as well as a measurement with smaller data type than previous container.