anmolnar commented on code in PR #1961:
URL: https://github.com/apache/zookeeper/pull/1961#discussion_r1064647933
##########
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServer.java:
##########
@@ -1151,6 +1213,9 @@ protected void setLocalSessionFlag(Request si) {
}
public void submitRequest(Request si) {
+ if (state == State.MAINTENANCE) {
+ throw new IllegalStateException("Zookeeper server is in
maintenance state");
+ }
Review Comment:
If you throw an exception here, the request will fail on the client side. I
haven't tried it myself, have you valdiated that the client is able to
seemlessly retry the command without bothering the user?
If not, I suggest another solution: create a semaphore which is closed while
the maintenace is happening and block this thread until it's finished. The
request will suffer some additionaly latency, but otherwise cannot be noticed.
Thoughts?
##########
zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md:
##########
@@ -2126,6 +2126,17 @@ options are used to configure the
[AdminServer](#sc_adminserver).
The time interval for rate limiting snapshot command to protect the server.
Defaults to 5 mins.
+* *admin.restore.enabled* :
+ (Java system property: **zookeeper.admin.restore.enabled**)
+ The flag for enabling the restore command. Defaults to false.
+ It will be enabled by default once the auth support for admin server commands
+ is available.
+
+* *admin.restore.intervalInMS* :
+ (Java system property: **zookeeper.admin.restore.intervalInMS**)
+ The time interval for rate limiting restore command to protect the server.
+ Defaults to 5 mins.
Review Comment:
Do we need this setting separately for all admin commands?
Shouldn't we just introduce a new general setting for the admin interface
which would rate limit all admin requests coming in?
I don't think anybody would like to set this individually for commands.
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