Andrey Mashenkov created IGNITE-21658:
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Summary: Make LowWatermark a top-level component
Key: IGNITE-21658
URL: https://issues.apache.org/jira/browse/IGNITE-21658
Project: Ignite
Issue Type: Improvement
Reporter: Andrey Mashenkov
Motivation.
Some components requires listening watermark updates for resource cleanup
purposes, but for now, LowWatermark component is internal object in
TableManager. E.g. CatalogManager and TableManager should destroy stale data
and collect the garbage.
Let's make LowWatermark a top-level component and subscribe all dependants.
Note:
* the components recovery process should be completed before any LWM update is
triggered. Thus, it's should be started at last.
* some operation may take a time and run asynchronously. Thus, it make no sense
to trigger next LWM events before the latest one has been completed.
* dependant components must be able to get valid watermark. Thus, LWM must be
recovered first.
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