[IMPALA-4099] Improve error message while loading UDFs with a missing jar

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.5.0
• Fix Version/s: Impala 2.5.5, Impala 2.8.0
• Component/s: Catalog
• Labels: supportability
• Assignee: Bharath Vissapragada
• Reporter: Bharath Vissapragada
• Created: 08/Sep/16 20:12
• Updated: 27/Oct/16 17:49
• Resolved: 13/Sep/16 15:31

Description

Right now, loading a UDF with a missing jar will give the following exception.

E0829 15:04:21.130985 19471 CatalogServiceCatalog.java:508] Skipping function load: rank_2 
Java exception follows: 
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 
at java.util.ArrayList.rangeCheck(ArrayList.java:635) 
at java.util.ArrayList.get(ArrayList.java:411) 
at com.cloudera.impala.catalog.CatalogServiceCatalog.extractFunctions(CatalogServiceCatalog.java:402) 
at com.cloudera.impala.catalog.CatalogServiceCatalog.loadJavaFunctions(CatalogServiceCatalog.java:503) 
at com.cloudera.impala.catalog.CatalogServiceCatalog.reset(CatalogServiceCatalog.java:559) 
at com.cloudera.impala.service.JniCatalog.<init>(JniCatalog.java:97)

We can include a check for this and have a meaningful error message to improve supportability.