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https://issues.apache.org/jira/browse/HDDS-4488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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runzhiwang resolved HDDS-4488.
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Resolution: Fixed
> Open RocksDB read only when loading containers
> ----------------------------------------------
>
> Key: HDDS-4488
> URL: https://issues.apache.org/jira/browse/HDDS-4488
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Components: Ozone Datanode
> Affects Versions: 1.1.0
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Labels: pull-request-available
>
> When a datanode is started, it must read some metadata from all the
> Containers. Part of that metadata is stored in RocksDB, so the startup
> process involves opening each rocksDB and closing it again.
> Testing on a dense node, with 45 high performance spinning disks and 200K
> containers, I saw about 75ms on average to open each RockDB. Further testing
> demonstrated that if we open RockDB read only, the average open time is about
> 35ms.
> At startup time, the DBs are only read and never written, so opening read
> only is fine. HDDS-4427 already ensures these opened DBs are not cached.
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