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https://issues.apache.org/jira/browse/HDDS-10212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hemant Kumar updated HDDS-10212:
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Summary: Add a configurable limit on number of open snapshots concurrently
(was: Add a configurable limit number of open snapshots concurrently)
> Add a configurable limit on 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
> Priority: Major
>
> 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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