MQSeries.net :: View topic - Global Cache

kash3338 · Posted: Thu Apr 28, 2016 3:46 am Post subject:

Hello all,

We have just started analyzing the Global Cache (GC) feature in a plan to implement it across our project replacing the existing Shared Variable cache. While we did a initial PoC, we found lots of concerns than any positives. Few of them are listed below, request your ideas and experience on this.

With the below limitations and concerns, we are afraid to take it further to the production environment. Performance of Global cache is seen to be a major setback.

PoC Environment Details:

1. When one the Broker is stopped and started, (ie. one catalog server is stopped and started) there is a partial data loss form the Global Cache. I understand this is a known behavior, but the documents does not say that explicitly. This restriction limits the usage/purpose of GC by a great extent.

2. When one of the Execution group (which is a catalog server) is in a stop state, the time taken to retrieve data from the GC is huge. Almost one minute for every query against the cache. This is a major set back.

3. When there is a restart of a Broker done, the time taken to retrieve data from the cache is taking too long (though only partial data comes here, but the time taken for the retrieve is too long)

4. Is there a way to view the data present in the Global Cache from outside? Does the Activity Log or mqsi commands or the Statistics provide us the feature to view data?

5. The mqsi commands available to get the details of the Global Cache returns some data which is very confusing. There is no proper documentation which explains this as well. For example, it lists a set of partitions under each EG and many more details. How and where can we find proper documentation on these commands?