turboFei commented on code in PR #2295:
URL: https://github.com/apache/incubator-kyuubi/pull/2295#discussion_r846055292
##########
docs/deployment/engine_lifecycle.md:
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@@ -60,6 +62,17 @@ The above two configurations can be used together to set the
TTL of engines.
These configurations are user-facing and able to use in JDBC urls.
Note that, for [connection](engine_share_level.html#connection) share level
engines that will be terminated at once when the connection is disconnected,
these configurations not necessarily work in this case.
+### Engine max lifetime
+| Key | Default
| Meaning
| Type | Since
|
+|----------------------------------------------|--------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------|--------------------------------------|
+| kyuubi\.session\.engine<br>\.spark\.max\.lifetime | <div style='width:
65pt;word-wrap: break-word;white-space: normal'>PT0s</div> | <div
style='width: 170pt;word-wrap: break-word;white-space: normal'>Max lifetime for
spark engine, the engine will self-terminate when it reaches the end of life. 0
or negative means not to self-terminate.</div>
| <div
style='width: 30pt'>duration</div> | <div style='width: 20pt'>1.6.0</div> |
+
+The max lifetime configuration only applies to spark engine currently.<br>
+For some use case, we might need restart the spark engine periodically. For
example, to load the latest UDFs and jars.<br>
+If the spark engine has been running for a specified time, it need to
deregister itself from engine discovery space(such as zookeeper) so that it
will not receive new request.
+Then it will wait the current connection to close, and terminate itself.
Review Comment:
move to `### Engine TTL` part?
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