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https://issues.apache.org/jira/browse/HDDS-14015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Swaminathan Balachandran resolved HDDS-14015.
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Fix Version/s: 2.2.0
Resolution: Fixed
> Atomic Switch of Snapshot db after defrag should be done under a
> SNAPSHOT_DB_LOCK
> ---------------------------------------------------------------------------------
>
> Key: HDDS-14015
> URL: https://issues.apache.org/jira/browse/HDDS-14015
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Swaminathan Balachandran
> Assignee: Swaminathan Balachandran
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> A snapshot handle present inside a snapshot cache can be reused. Once the
> snapshot content lock is taken a rocksdb handle could be still present in the
> snapshot cache and after the atomic switch the old db handle could still get
> reused for writes thus missing potential writes on the newly switched db.
> Hence while performing the atomic switch a snapshot cache lock should be
> acquired to ensure the next db handle would always be from the new rocksdb
> handle. So deletion of older directories should be under the snapshot content
> lock.
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