Hi,
May be I was not clear in my last mail. My question is that can we monitor a
jvm based on it’s own member timeout instead of the member timeout of some
other jvm(which is monitoring the this jvm).
Now if my view is [s1(coordinator), s2, s3, s4, s5] and member timeout for each
member is different, the member s3 will suspect s4 on the basis of s3 member
timeout and then final check will be done by coordinator member timeout. Every
time the view changes, the order of monitoring also changes. So we cannot
determine for how much time will a particular jvm will be removed from the view.
This can be solved if we use the member timeout of the jvm which is being
monitored by the current member.
In the above view suppose s3 is monitoring s4. Now s3 marks s4 as suspect
member on the basis of s3 member timeout. Instead of this if s3 gets the
member timeout of s4 and uses this new timeout to monitor s4, then we can
determine for how much time a member will be removed from the view.
Is there any way to get the member timeout of one member from an another ?
Thanks,
Aravind Musigumpula
From: Aravind Musigumpula
Sent: Monday, July 03, 2017 9:35 PM
To: u...@geode.apache.org
Cc: bschucha...@pivotal.io
Subject: RE: Different member-timeout for particular jvm’s
Hi,
Can the member-timeout of a particular jvm can be used by the monitoring jvm.
Example: jvm1 monitors jvm2, jvm2 monitors jvm 3. Member timeout for jvm1 is
10, jvm2 is 20 and jvm3 is 30. Suppose the jvm4 is coordinator and its member
timeout is 30. So what if we want jvm1 should be monitored by other jvm’s for a
deterministic time like 10 and jvm2 should be monitored for 20.
Right now, I understand that a jvm will be monitored by member timeout of the
monitoring jvm and coordinator. My requirement is the each jvm should be
monitored by its own member timeout followed by coordinator’s member-timeout.
In code there is a wait for a member timeout variable in GMSHealthMonitor.java.
if (pingResp.getResponseMsg() == null) {
pingResp.wait(memberTimeout);
}
What if we get the member timeout of the jvm which is monitored by this one. We
can do this in setNextNeighbor function in GMSHealthMonitor.java
But how to get the member-timeout of other jvm. Is it possible?
Thanks,
Aravind Musigumpula
From: Bruce Schuchardt [mailto:bschucha...@pivotal.io]
Sent: Tuesday, June 20, 2017 9:16 PM
To: u...@geode.apache.org<mailto:u...@geode.apache.org>
Subject: Re: Different member-timeout for particular jvm’s
It is the membership coordinator that performs the final check on a suspect
member. If you have network partition detection enabled or are using
authentication of peers the role of membership coordinator will be a locator
(if one is in the system) so in your scenario it will be the Locator that
performs this check. It will use its own member-timeout to determine how long
to wait for a response to a "final check" message to the suspected member.
If the Locator is down then the oldest member in the system will take over the
role. This might be server1 if the membership view is [ s1, s2, s4, s3 ]. If
there is a problem with s2 then s1 will use its own member-timeout setting to
determine how long to wait for a final-check response from s1.
On 6/20/17 8:18 AM, Aravind Musigumpula wrote:
Hi,
Is there any way to configure different member-timeout for particular jvm’s.
According to my understanding each jvm monitors its neighbor. If any jvm is
missing heart beat from its neighbor, it waits for member-timeout interval and
sends a suspect message. Then Coordinator tries to contact that particular jvm,
if it is unable to connect to that jvm. Coordinator waits for its configured
member-timeout interval and removes that member if it is unable to connect to
that jvm.
Scenario:
Locator: member-timeout=10000
Server1: member-timeout=20000
Server2: member-timeout=30000
Server3: member-timeout=20000
Server4: member-timeout=20000
Suppose server1 is monitoring server2. I made server2 stuck. So server1 tries
to contact the server2 , waits for 20000ms and sends suspect message. Then
locator tries to connect with server2 , if unable to connect waits for 10000
and removes server3 from view.
My requirement is I don’t want to kick server2 until 40000ms. This can be done
by setting 30000 for the jvm which monitors server2. But how can we see that
this particular jvm monitors server2. In my case every time different jvm is
monitoring server2.
Please correct me if I am wrong.
Thanks,
Aravind Musigumpula
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you may review at https://www.amdocs.com/about/email-disclaimer
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