The HintedHandoffEnabled attribute is read/write.
I am unable to enable/disable HH via JMX (JConsole).
Even though the load is on and read/writes happening, I don't see "operations" component on Jconsole. To clarify further, I see only Jconsole->MBeans->org.apache.cassandra.db.StorageProxy.Attributes. I don't see Jconsole->MBeans->org.apache.cassandra.db.StorageProxy.Operations. As a result I cannot operation like enable/disable HH.
Is this is a bug or I am missing something?