A thread dump should be automatically generated by the system when this issue occurs for diagnostic purposes.

This is just a trivial change, making sure we add a ThreadDump in case a file is not returned within 5 seconds.

The current theory that when this happens there is something slowing down the system. Perhaps slow storage... but by the time we are able to capture any thread dumps it's already too late and the system is back to normal.

To simplify and helping to identify any possible issues (in software or infra-structure) this simple 2 lines change (calling the ThreadDumpUtil) would help identify possible causes.