Hemant Kumar created HDDS-10212:
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Summary: Add a configurable limit number of open snapshots
concurrently
Key: HDDS-10212
URL: https://issues.apache.org/jira/browse/HDDS-10212
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Hemant Kumar
Currently, there is no limit on number of snapshots open. User can open as many
snapshots as they want. We limit the number of snapshot diff jobs running but
that doesn't guarantee on number of open snapshots because client can perform
read operations on snapshots independently.
This task is to add the configurable limit on number of snapshot possibly in
snapshotCache. And reject the *SnapshotCache#get()* if SnapshotCache reaches to
this limit.
One thing to keep in mind that this limit should not impact background services
like {*}KeyDeletingService{*}, *SnapshotDirCleanUpService* etc, otherwise these
operation may not succeed for the long time.
e.g. let’s say snapshot cache limit is 1000 and 995 snapshots are open and in
used by clients for read operations or snapshot diff. GC kicks in and it needs
to move certain keys and for that it needs to opens more than 5 snapshots. It
will fails the run and possible subsequent run as well if it can open needed
snapshots till SnapshotCache.
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