SAS OnDemand Decision Engine uses a hybrid queue to store transactions if the Transaction Data Repository (TDR) is down or responding slowly. If the hybrid queue becomes full, a message is recorded in the console log file as not processed.

By default, the SAS OnDemand Decision Engine hybrid queue files are stored in the /tmp directory. SAS KB0042876, "Redirect the location of the SAS^® Fraud Management SAS^® OnDemand Decision Engine HybridQueue files" describes how to redirect the hybrid queue files to a different location.

You should treat the SAS OnDemand Decision Engine hybrid queue files as one unit. You should either delete them all or keep them all together. You should not delete or move individual files.

If you remove some of the alert-queue*.txn files, SAS OnDemand Decision Engine start fails. A FATAL error similar to the following is written to the SAS OnDemand Decision Engine log:

2025-06-17T06:31:17,205 [main] FATAL OSE$Main

java.lang.AssertionError: java.io.FileNotFoundException: /tmp/alert-queue-0000.txn (No such file or directory)

Workaround

To circumvent this issue, move or delete all the alert-queue* files.