Support dynamic update HeartbeatThread related propertykey

[maobaolong]

Is your feature request related to a problem? Please describe.

Now, there are over 20 propertykey related HeartbeatThread, which we want to update dynamically.

Describe the solution you'd like

Add listener to HeartbeatThread.

Urgency

Middle

Additional context
No

[LuQQiu]

@maobaolong can you give an example of what's the case you want to update heartbeat thread dynamically?

[maobaolong]

@LuQQiu For example ttl check interval

Reference this

[LuQQiu]

so basically we want the Alluxio cluster maintainer to be able to trigger the job that they want at any given time?

[maobaolong]

@LuQQiu Yeah, if the initial heartbeat related interval configures are not good enough, cluster maintainer will use bin/alluxio updateConf command to update the interval propertykey, then the heartbeat interval will changed, this is what we expect.