I'm using Cassandra 3.11 right out of the box (i.e. all default parameters) with the IBM JRE. Using any UDF results in a stack overflow error. They work fine with the Oracle JVM. I've tried increasing some stack sizes (-Xss and -Xmso), but that does not help. Is there some configuration I'm missing?
CREATE TABLE test ( id int, val1 int, val2 int, PRIMARY KEY(id) ); INSERT INTO test(id, val1, val2) VALUES(1, 100, 200); INSERT INTO test(id, val1, val2) VALUES(2, 100, 300); INSERT INTO test(id, val1, val2) VALUES(3, 200, 150); CREATE OR REPLACE FUNCTION maxOf(current int, testvalue int) CALLED ON NULL INPUT RETURNS int LANGUAGE java AS $$return Math.max(current,testvalue);$$; SELECT id, val1, val2, maxOf(val1,val2) FROM test WHERE id = 1; Here's the stack trace from debug.log: java.lang.RuntimeException: java.lang.StackOverflowError at org.apache.cassandra.cql3.functions.UDFunction.async(UDFunction.java:453) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.functions.UDFunction.executeAsync(UDFunction.java:398) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.functions.UDFunction.execute(UDFunction.java:298) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.selection.ScalarFunctionSelector.getOutput(ScalarFunctionSelector.java:61) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.selection.Selection$SelectionWithProcessing$1.getOutputRow(Selection.java:592) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.selection.Selection$ResultSetBuilder.getOutputRow(Selection.java:430) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.selection.Selection$ResultSetBuilder.build(Selection.java:417) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.statements.SelectStatement.process(SelectStatement.java:763) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.statements.SelectStatement.processResults(SelectStatement.java:400) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:378) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:251) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:79) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:217) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:233) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:116) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:517) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:410) [apache-cassandra-3.11.0.jar:3.11.0] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.44.Final.jar:4.0.44.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.0.44.Final.jar:4.0.44.Final] at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:35) [netty-all-4.0.44.Final.jar:4.0.44.Final] at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:348) [netty-all-4.0.44.Final.jar:4.0.44.Final] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:522) [na:1.8.0] at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) [apache-cassandra-3.11.0.jar:3.11.0] at java.lang.Thread.run(Thread.java:795) [na:2.9 (09-01-2017)] Caused by: java.lang.StackOverflowError: null at java.lang.String.substring(String.java:2637) ~[na:2.9 (09-01-2017)] at java.lang.Class.getNonArrayClassPackageName(Class.java:1531) ~[na:2.9 (09-01-2017)] at java.lang.Class.getPackageName(Class.java:1546) ~[na:2.9 (09-01-2017)] at java.lang.J9VMInternals$2.run(J9VMInternals.java:252) ~[na:2.9 (09-01-2017)] at java.security.AccessController.doPrivileged(AccessController.java:647) ~[na:1.8.0] at java.lang.J9VMInternals.checkPackageAccess(J9VMInternals.java:250) ~[na:2.9 (09-01-2017)] at org.apache.cassandra.cql3.functions.ThreadAwareSecurityManager.isSecuredThread(ThreadAwareSecurityManager.java:210) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.functions.ThreadAwareSecurityManager.checkPackageAccess(ThreadAwareSecurityManager.java:259) ~[apache-cassandra-3.11.0.jar:3.11.0] at java.lang.J9VMInternals$2.run(J9VMInternals.java:254) ~[na:2.9 (09-01-2017)] at java.security.AccessController.doPrivileged(AccessController.java:647) ~[na:1.8.0] at java.lang.J9VMInternals.checkPackageAccess(J9VMInternals.java:250) ~[na:2.9 (09-01-2017)] at org.apache.cassandra.cql3.functions.ThreadAwareSecurityManager.isSecuredThread(ThreadAwareSecurityManager.java:210) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.cql3.functions.ThreadAwareSecurityManager.checkPackageAccess(ThreadAwareSecurityManager.java:259) ~[apache-cassandra-3.11.0.jar:3.11.0] [previous 5 lines repeated many times] at java.lang.J9VMInternals$2.run(J9VMInternals.java:254) ~[na:2.9 (09-01-2017)] at java.security.AccessController.doPrivileged(AccessController.java:647) ~[na:1.8.0] at java.lang.J9VMInternals.checkPackageAccess(J9VMInternals.java:250) ~[na:2.9 (09-01-2017)] at org.apache.cassandra.cql3.functions.UDFunction$$Lambda$277.00000000154A7350.call(Unknown Source) ~[na:na] at java.util.concurrent.FutureTask.run(FutureTask.java:277) ~[na:1.8.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1160) ~[na:1.8.0] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:1.8.0] at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.concurrent.NamedThreadFactory$$Lambda$12.0000000013A22FB0.run(Unknown Source) ~[na:na] ... 1 common frames omitted
