On 29/06/2020 21:41, Christopher Schultz wrote:
> Mark,
> On 6/27/20 05:29, Mark Thomas wrote:
>> On 27/06/2020 10:19, Thomas Meyer wrote:
>>> Hi,
>>> A few questions regarding tomcat session replication:
>> load-balancing and session replication are two separate parts of
>> an overall clustering solution.
>>> 1) is the jvmRoute attribute on Engine object necessary for
>>> session replication to work correctly?
>> No, but if you don't use it it places a number of restrictions on
>> the web application behaviour and on the configuration of session
>> replication.
>> The limitations are: - you need to use the DeltaManager (which
>> doesn't scale as well as the BackupManager); - any requests made by
>> the client that depend on the session MUST be issued in series, not
>> in parallel; and
> This is only true of requests that would modify the session-state in a
> way that needed to be deterministic, right? A bunch of GET requests
> that don't change the session ought to be okay in parallel (as long as
> any prior state-changing requests have completed _ those changes
> replicated).

You don't want state changes in parallel on different nodes.
Any request that depends on a previous change in state can't be issued
until the state changing request has completed and the changes replicated.

>> - the session Manager must be configured to update all the other
>> nodes in the cluster BEFORE the current request returns to the
>> client.
> Same (negative) caveat here, right?


Essentially you want channelSendOptions="6".


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