Elastic Search Test Facility in "Read-Only" Mode (Doc ID 2573064.1)

Last updated on FEBRUARY 21, 2024

Applies to:

Goal

Elasticsearch support was included in Messaging Server 8.0.2.x.

Questions have risen about how much space would be required for the Elasticsearch data, when planning the switch from ISS to Elasticsearch.

Can the migration facility be run in "test" mode:

• Send the data to the specific Elastic server for indexing, but don't change anything on the Messaging Server side
• Keep sending data to ISS, as always
• Keep sending searches to ISS
• Be able to interrupt the test migration tool at any time, if it is causing a load issue on the system

To migrate, the ultimate plans would be to bring up a new backend which would be configured to use Elastic and migrate users to it.  Then, reconfigure the newly emptied backend, and "lather, rinse, repeat."

How much space it will require? Additionally, duplicating the load of production data in a test environment is ... complicated, for a number of reasons.

If we could run a utility which would be used if we were to use the other migration method, but in a test mode so it is only sends data to Elastic for indexing, but not changing anything on the Messaging Server, not actually using the Elasticsearch feature... could address two concerns:

• How much load would that thing place on the production system when try to do the migration that way? and how long would it take?
• How much space would Elastic need?

Can the migration tool be run without having to set the other config options which would tell the system to use Elastic? Hence, we could:

• Run the tool
• Measure the load while it is running
• Be able to determine how long such an operation would take if decided to go that route
• Be able to stop it immediately if it starts to cause a load problem (or if Elastic starts to run out of space)
• See exactly how much space would be required using our production data

Solution

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.