Mount a vMX with Junos version 17.3 ends up with OOM expection.
Attached a deadlock revealed by Java Yourkit Profiler.

Link to the thread dump: https://drive.google.com/open?id=0B6yJWkVd2RfUdW4xZTJfR3hOUkk
Link to the schema being parsed: https://drive.google.com/open?id=0B6yJWkVd2RfUdW4xZTJfR3hOUkk
Link to the logs at TRACE level (but for NETCONF): https://drive.google.com/open?id=0B6yJWkVd2RfUdW4xZTJfR3hOUkk

Increasing the memory of ODL to 8GO fixes this issues.

Opening this ticket in case it worth being looked at this improve Yangtools parsing mechanism so it handles better heavy load.