wuchang questions

• What if a HashMap is full?
• mongodb ISODate problems
• How to find out the driver node for my Spark?
• Will code after eval(die "some error message") continue to be executed?
• java mongodb sort() and limit() function
• perl expression "or" and subroutine "isa"
• How can I convert a string to a file handle in perl?
• Kafka connector- cannot stop rebalancing
• C++ sizeof operator before and after extending
• Java GC:old generation becomes larger and larger and cannot be reclaimed

wuchang answers