at io.grpc.Metadata$Key.validateName(Metadata.java:754) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.Metadata$Key.<init>(Metadata.java:762) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.Metadata$Key.<init>(Metadata.java:671) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.Metadata$AsciiKey.<init>(Metadata.java:971) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.Metadata$AsciiKey.<init>(Metadata.java:966) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.Metadata$Key.of(Metadata.java:708) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.Metadata$Key.of(Metadata.java:704) ~[grpc-api-1.48.0.jar!/:1.48.0]
at io.grpc.internal.GrpcUtil.<clinit>(GrpcUtil.java:84) ~[grpc-core-1.48.0.jar!/:1.48.0]
at io.grpc.netty.shaded.io.grpc.netty.Utils.<clinit>(Utils.java:83) ~[grpc-netty-shaded-1.48.0.jar!/:1.48.0]
at io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder.<clinit>(NettyChannelBuilder.java:83) ~[grpc-netty-shaded-1.48.0.jar!/:1.48.0]
at com.hazelcast.jet.python.DagPythonProcessor.<init>(DagPythonProcessor.java:96) ~[classes!/:?]
... 39 more```
May be Cassandra issue plus