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Behavior on clustered environment


Behavior on clustered environment

By : Ines Sombra
Date : October 25 2020, 09:10 AM
Any of those help Let me explain the distinction between E- and D-nodes first.
Any host that participates in a MarkLogic cluster can potentially operate as E or D, or even both.
code :


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Using Quartz in a clustered environment

Using Quartz in a clustered environment


By : ScryptSmith
Date : March 29 2020, 07:55 AM
I hope this helps you . Yes, you need to use the JDBC-JobStore, or else the TerracottaJobStore to enable a mechanism for the nodes to communicate with each other (in the one case they communicate in the db tables, in the other via the Terracotta networking features).
Composite clustered PK behavior vs Nonclustered PK + nonunique clustered index

Composite clustered PK behavior vs Nonclustered PK + nonunique clustered index


By : thatliamkid
Date : March 29 2020, 07:55 AM
wish of those help If your two most popular queries are "how many files contain appId" and "which appId is most popular", you should make this indexed view:
code :
CREATE VIEW
        v_appCount
WITH SCHEMABINDING
AS
        SELECT  appId, COUNT_BIG(*) AS cnt
        FROM    dbo.mytable
        GROUP BY
                appId
GO

CREATE UNIQUE CLUSTERED INDEX
        ux_v_appCount_appId
ON      v_appCount (appId)
SELECT  cnt
FROM    v_appCount
WHERE   appId = @myAppId
SELECT  TOP 100
        *
FROM    v_appCount va
ORDER BY
        appId DESC
Scheduler in clustered environment

Scheduler in clustered environment


By : Boston Weber
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Just for completeness: we ended up with persistent Quartz job scheduling.
This post helped me a lot about persistent Quartz scheduling with Spring.
Hibernate session cache behavior in clustered environment?

Hibernate session cache behavior in clustered environment?


By : Dhanushka Erabadda
Date : March 29 2020, 07:55 AM
may help you . Yes p1 will be a stale record. If you update p1, on session flush or transaction commit of session s1, p1 will overwrite p2's update.
To prevent this you can use Optimistic locking. Specify a version-number (@Version in java source code) (or last-updated-date if you have such a column) and instruct hibernate to use this column to version updates. In which case if we update p1, on session flush hibernate would perform a select before update, see that the version information doesn't match (someone got in, in between and updated the record) and throw a StaleObject exception
Behavior of a Spring session-scoped bean and a Java static object in a clustered environment

Behavior of a Spring session-scoped bean and a Java static object in a clustered environment


By : R2019
Date : March 29 2020, 07:55 AM
will be helpful for those in need Information stored in a static variable stays local to the classloader that loaded that class, it doesn't get migrated. Anything that you (or Spring) puts in the HttpSession gets migrated because the application server is responsible for providing the session and it knows where the other nodes are and it can be set up to do that in particular.
This is one of the reasons static variables (and roll-your-own caching) are problematic, because you can build an application with them that works fine on one server, but if you deploy it to multiple nodes it doesn't work as well because the caches aren't consistent with each other.
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